Relevant bibliographies by topics / Magnetic resonance imaging (MRI)

Academic literature on the topic 'Magnetic resonance imaging (MRI)'

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Published: 4 June 2021
Last updated: 8 June 2024

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Journal articles on the topic "Magnetic resonance imaging (MRI)"

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Teraoka, Kunihiko. "Cardiac magnetic resonace: stress perfusion magnetic resonance imaging and coronary magnetic resonance angiography." Journal of the Japanese Coronary Association 20, no. 2 (2014): 148–51. http://dx.doi.org/10.7793/jcoron.20.015.

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YOUNG, A. E. R., and J. S. M. ZORAB. "Magnetic resonance imaging (MRI)." European Journal of Anaesthesiology 14, no. 3 (May 1997): 344–45. http://dx.doi.org/10.1097/00003643-199705000-00027.

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Young, A. E. R., and J. S. M. Zorab. "Magnetic resonance imaging (MRI)." European Journal of Anaesthesiology 14, no. 03 (May 1997): 344. http://dx.doi.org/10.1017/s026502159725057x.

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Suwanwla, N. "Magnetic Resonance Imaging (MRI)." Chulalongkorn Medical Journal 31, no. 1 (January 1987): 1–4. http://dx.doi.org/10.58837/chula.cmj.31.1.1.

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Gentile, Julie P. "Reactive Lymphadenopathy: Triggering False Positives on Magnetic Resonance Imaging." Journal of Quality in Health Care & Economics 5, no. 3 (2022): 1–3. http://dx.doi.org/10.23880/jqhe-16000270.

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There are numerous etiologies of reactive lymphadenopathy on radiological imaging. Lymph node evaluation is critical for screening high risk patients for new pathology, and for the planning of systemic chemotherapy and radiation therapy. Although ultrasonography (US) is useful for screening and staging illness, it is not completely reliable. In addition to being subjective, there is also poor accessibility of deeply located lymph nodes. Breast Magnetic Resonance Imaging (MRI) offers the advantages of provision of a larger field of view, increased capability of comparison of right and left axillary areas, and increased sensitivity and specificity. It is reported that pandemic H1N1v and seasonal influenza vaccinations cause alteration in fluorodeoxyglucose avidity in positron emission tomography (PET)/CT scans. There were no identified scientific publications documenting the possibility of false positives on MRI due to the Shingrix vaccine, nor any universal recommendations for patients to avoid vaccinations for a specified period of time prior to imaging. The following is a case report of false positive reactive lymphadenopathy found in a healthy patient during breast MRI screening due to high risk status.
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Saleem, Sahar N. "Fetal Magnetic Resonance Imaging (MRI)." Journal of Child Neurology 28, no. 7 (May 3, 2013): 890–908. http://dx.doi.org/10.1177/0883073813486296.

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Rauscher, Nina. "Understanding Magnetic Resonance Imaging (MRI)." Orthopaedic Nursing 9, no. 4 (July 1990): 60. http://dx.doi.org/10.1097/00006416-199007000-00010.

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Ashraf, Yasma, Irum Iqbal, and Shafaat Khatoon. "MAGNETIC RESONANCE IMAGING;." Professional Medical Journal 24, no. 04 (April 6, 2017): 560–64. http://dx.doi.org/10.29309/tpmj/2017.24.04.1512.

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Perianal fistula is defined as an abnormal communication channel between analcanal and perianal skin. Among all the imaging tools Magnetic resonance imaging (MRI) isof choice in the diagnosis and management of perianal fistulas. Objectives: “To determinethe diagnostic accuracy of MR imaging in detection of perianal fistulas and comparing it withper operative findings”. Peroperative findings are taken as gold standard. Place and Durationof Study: This study was carried out in Diagnostic Radiology, Pakistan Institute of MedicalSciences (P.I.M.S) Islamabad, over a period of nine months from 01-02-2012 to 31-10-2012. Forthis collaboration was made with the Department of General Surgery P.I.M.S and Departmentof gynecology (MCH center) PIMS and gastroenterology Department. Patients and Methods:A total of 95 patients were included in study having perianal fistulas on clinical examination.MRI was performed in the patients and T1-weighted fast spin echo (T1W FSE) images weretaken before and after gadolinium injection. Fat suppressed T2-weighted fast spin echo (T2WFSE) images were obtained in all three planes including transverse, sagittal and coronal. Allthe scans were viewed by a single consultant radiologist to avoid observer bias. Results: Outof 95, 81 patients (85.3%) were male and 14 (14.7%) were female. Sensitivity, specificity andaccuracy of magnetic resonance imaging (MRI) was 96.2%, 75.0% and 92.6%, respectively.Positive predictive value was 95.0% and negative predictive value was 80.0%. Conclusion: ourstudy proves that among imaging modalities MRI is of choice for preoperative assessment ofperianal fistulas. It provides highly accurate, noninvasive and relatively very less time consumingmeans of performing pre-operative evaluation, specially the complex, branching fistulas. Thisdiagnostic accuracy not only helps in surgical cure but avoids recurrence and post-operativecomplications like fecal incontinence
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Ishikawa, Yuichi. "Cardiac Magnetic Resonance Imaging." Pediatric Cardiology and Cardiac Surgery 32, no. 4 (2016): 291–306. http://dx.doi.org/10.9794/jspccs.32.291.

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Arenas, Maria Alejandra Ardila, Dirk Gutkelch, Olaf Kosch, Rüdiger Brühl, Frank Wiekhorst, and Norbert Löwa. "Development of Phantoms for Multimodal Magnetic Resonance Imaging and Magnetic Particle Imaging." Polymers 14, no. 19 (September 20, 2022): 3925. http://dx.doi.org/10.3390/polym14193925.

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Phantoms are crucial for the development of imaging techniques based on magnetic nanoparticles (MNP). They serve as test objects to simulate application scenarios but are also used for quality assurance and interlaboratory comparisons. Magnetic particle imaging (MPI) is excellent for specifically detecting magnetic nanoparticles (MNP) without any background signals. To obtain information about the surrounding soft tissue, MPI is often used in combination with magnetic resonance imaging (MRI). For such application scenarios, this poses a challenge for phantom fabrication, as they need to accommodate MNP as well as provide MR visibility. Recently, layer-by-layer fabrication of parts using Additive Manufacturing (AM) has emerged as a powerful tool for creating complex and patient-specific phantoms, but these are characterized by poor MR visibility of the AM material. We present the systematic screening of AM materials as candidates for multimodal MRI/MPI imaging. Of all investigated materials, silicone (Dreve, Biotec) exhibited the best properties with sufficient MR-signal performance and the lowest absorption of MNP at the interface of AM materials. With the help of AM and the selection of appropriate materials, we have been able to produce suitable MRI/MPI phantoms.
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Dissertations / Theses on the topic "Magnetic resonance imaging (MRI)"

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Peterson, Erika. "Synthetic MRI for visualization of quantitative MRI." Thesis, Linköpings universitet, Avdelningen för radiologiska vetenskaper, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-102651.

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Magnetic resonance imaging (MRI) is an imaging technique that is used in hospitals worldwide. The images are acquired through the use of an MRI scanner and the clinical information is provided through the image contrast, which is based on the magnetic properties in biological tissue. By altering the scanner settings, images with different contrast properties can be obtained. Conventional MRI is a qualitative imaging technique and no absolute measurements are performed. At Center for Medical Imaging and Visualization (CMIV) researchers are developing a new MRI technique named synthetic MRI (SyMRI). SyMRI is based on quantitative measurements of data and absolute values of the magnetic properties of the biological tissue can be obtained. The purpose of this master thesis has been to take the development of SyMRI a step further by developing and implementing a visualization studio for SyMRI imaging of the human brain. The software, SyMRI Brain Studio, is intended to be used in clinical routine. Input from radiologists was used to evaluate the imaging technique and the software. Additionally, the requirements of the radiologists were converted into technical specifications for the imaging technique and SyMRI Brain Studio. Additionally, validation of the potential in terms of replacing conventional MRI with SyMRI Brain Studio was performed. The work resulted in visualization software that provides a solid formation for the future development of SyMRI Brain Studio into a clinical tool that can be used for validation and research purposes. A list of suggestions for the future developments is also presented. Future clinical evaluation, technical improvements and research are required in order to estimate the potential of SyMRI and to introduce the technique as a generally used clinical tool.
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Eichner, Cornelius. "Slice-Accelerated Magnetic Resonance Imaging." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-184944.

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This dissertation describes the development and implementation of advanced slice-accelerated (SMS) MRI methods for imaging blood perfusion and water diffusion in the human brain. Since its introduction in 1977, Echo-Planar Imaging (EPI) paved the way toward a detailed assessment of the structural and functional properties of the human brain. Currently, EPI is one of the most important MRI techniques for neuroscientific studies and clinical applications. Despite its high prevalence in modern medical imaging, EPI still suffers from sub-optimal time efficiency - especially when high isotropic resolutions are required to adequately resolve sophisticated structures as the human brain. The utilization of novel slice-acceleration methods can help to overcome issues related to low temporal efficiency of EPI acquisitions. The aim of the four studies outlining this thesis is to overcome current limitations of EPI by developing methods for slice-accelerated MRI. The first experimental work of this thesis describes the development of a slice-accelerated MRI sequence for dynamic susceptibility contrast imaging. This method for assessing blood perfusion is commonly employed for brain tumor classifications in clinical practice. Following up, the second project of this thesis aims to extend SMS imaging to diffusion MRI at 7 Tesla. Here, a specialized acquisition method was developed employing various methods to overcome problems related to increased energy deposition and strong image distortion. The increased energy depositions for slice-accelerated diffusion MRI are due to specific radiofrequency (RF) excitation pulses. High energy depositions can limit the acquisition speed of SMS imaging, if high slice-acceleration factors are employed. Therefore, the third project of this thesis aimed at developing a specialized RF pulse to reduce the amount of energy deposition. The increased temporal efficiency of SMS imaging can be employed to acquire higher amounts of imaging data for signal averaging and more stable model fits. This is especially true for diffusion MRI measurements, which suffer from intrinsically low signal-to-noise ratios. However, the typically acquired magnitude MRI data introduce a noise bias in diffusion images with low signal-to-noise ratio. Therefore, the last project of this thesis aimed to resolve the pressing issue of noise bias in diffusion MRI. This was achieved by transforming the diffusion magnitude data into a real-valued data representation without noise bias. In combination, the developed methods enable rapid MRI measurements with high temporal efficiency. The diminished noise bias widens the scope of applications of slice- accelerated MRI with high temporal efficiency by enabling true signal averaging and unbiased model fits. Slice-accelerated imaging for the assessment of water diffusion and blood perfusion represents a major step in the field of neuroimaging. It demonstrates that cur- rent limitations regarding temporal efficiency of EPI can be overcome by utilizing modern data acquisition and reconstruction strategies.
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Graff, Christian George. "Parameter Estimation in Magnetic Resonance Imaging." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195912.

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This work concerns practical quantitative magnetic resonance (MR) imaging techniques and their implementation and use in clinical MR systems. First, background information on MR imaging is given, including the physics of the magnetic resonance, relaxation effects and how imaging is accomplished.Subsequently, the first part of this work describes the estimation of the T2 relaxation parameter from fast spin-echo (FSE) data. Various complications are considered, including partial volume and data from multiple receiver coils along with the effects of the timing parameters on the accuracy of T2 estimates. Next, the problem of classifying small (1 cm diameter) liver lesions using T2 estimates obtained from radially-acquired FSE data collected in a single breath-hold is considered. Several algorithms are proposed for obtaining lesion T2 estimates, and these algorithms are evaluated with a task-based metric, their ability to separate two classes of lesions, benign and malignant. A novel computer-generated phantom is developed for the generation of the data used in this evaluation.The second part of this work describes techniques that perform the separation of water and lipid signals while simultaneously estimating relaxation parameters that have clinical relevance. The acquisition sequences used here are Cartesian and radial versions of Gradient and Spin-Echo (GRASE). The radial GRASE technique is post-processed with a novel algorithm that estimates the T2 of the water signal independent of the lipid signal. The accuracy of this algorithm is evaluated in phantom and its potential use for detecting inflammation of the liver is evaluated using clinical data. Cartesian GRASE data is processed to obtain T2-dagger and lipid fraction estimates in bone which can be used to assess bone quality. The algorithm is tested in phantom and in vivo, and preliminary results are given.In the concluding chapter results are summarized and directions for future work are indicated.
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Rydell, Joakim. "Advanced MRI Data Processing." Doctoral thesis, Linköping : Department of Biomedical Engineering, Linköpings universitet, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10038.

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Brown, David Gerald. "Instrumentation for parallel magnetic resonance imaging." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4784.

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Parallel magnetic resonance (MR) imaging may be used to increase either the throughput or the speed of the MR imaging experiment. As such, parallel imaging may be accomplished either through a "parallelization" of the MR experiment, or by the use of arrays of sensors. In parallelization, multiple MR scanners (or multiple sensors) are used to collect images from different samples simultaneously. This allows for an increase in the throughput, not the inherent speed, of the MR experiment. Parallel imaging with arrays of sensor coils, on the other hand, makes use of the spatial localization properties of the sensors in an imaging array to allow a reduction in the number of phase encodes required in acquiring an image. This reduced phase-encoding requirement permits an increase in the overall imaging speed by a factor up to the number of sensors in the imaging array. The focus of this dissertation has been the development of cost-effective instrumentation that would enable advances in the state of the art of parallel MR imaging. First, a low-cost desktop MR scanner was developed (< $13,000) for imaging small samples (2.54 cm fields-of view) at low magnetic field strengths (< 0.25 T). The performance of the prototype was verified through bench-top measurements and phantom imaging. The prototype transceiver has demonstrated an SNR (signal-to-noise ratio) comparable to that of a commercial MR system. This scanner could make parallelization of the MR experiment a practical reality, at least in the areas of small animal research and education. A 64-channel receiver for parallel MR imaging with arrays of sensors was also developed. The receiver prototype was characterized through both bench-top tests and phantom imaging. The parallel receiver is capable of simultaneous reception of up to sixty-four, 1 MHz bandwidth MR signals, at imaging frequencies from 63 to 200 MHz, with an SNR performance (on each channel) comparable to that of a single-channel commercial MR receiver. The prototype should enable investigation into the speed increases obtainable from imaging with large arrays of sensors and has already been used to develop a new parallel imaging technique known as single echo acquisition (SEA) imaging.
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Rej, Ewa. "Hyperpolarized Nanodiamond for Magnetic Resonance Imaging." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15915.

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This thesis describes a new MRI contrast agent based on hyperpolarized 13C in nanodiamond. Nanodiamonds are readily available, non-toxic, can be surface functionalized, and have long T1 relaxation times. Electronic defects in the nanodiamonds are used to hyperpolarize the 13C nuclear spins through dynamic nuclear polarization, building up large nuclear magnetic resonance signals that persist for a long time. Enhancements are comparable to those used in liquid state hyperpolarization experiments, and can be detected in an MRI scan with low background signal. This imaging modality encompasses no ionizing radiation, and long imaging windows stemming from the long T1 relaxation times of solids.
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MacLellan, Steven. "Novel polymeric magnetic resonance imaging (MRI) contrast agents." Thesis, University of Strathclyde, 2009. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=12805.

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Richards, Jennifer Margaret Jane. "Magnetic resonance imaging in cardiovascular disease." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8079.

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Background Superparamagnetic particles of iron oxide (SPIO) are part of a novel and exciting class of ‘smart’ magnetic resonance imaging (MRI) contrast agents that are taken up by inflammatory cells. Ultrasmall SPIO (USPIO; ~30 nm diameter) can be used to assess cellular tissue inflammation and SPIO (80-150 nm) have the potential to be used to label cells ex vivo for in vivo cell tracking studies. Objectives The aims of the thesis were therefore (i) to develop and validate quantitative MRI methodology for assessing SPIO uptake within tissues, (ii) to demonstrate USPIO accumulation within the aortic wall and its implications in patients with abdominal aortic aneurysms (AAA), and (iii) to develop and apply a Good Manufacturing Practice (GMP) compliant method of SPIO cell labelling in healthy volunteers. Methods Patients with asymptomatic AAA >4.0 cm in diameter were recruited. Imaging sequences were optimised in eight patients using a 3 tesla MRI scanner. Data were analysed using the decay constant for multi echo T2* weighted (T2*W) sequences (T2*) or its inverse (R2*) and the repeatability of these measurements was established. A further twenty-nine patients underwent MRI scanning before and 24- 36 hours after administration of USPIO. T2 and multi echo T2*W sequences were performed and ultrasound-based growth rate data were collected. Operative aortic wall tissue samples were obtained from patients undergoing open surgical aneurysm repair. A GMP compliant protocol was developed for labelling cells with SPIO for clinical cell tracking studies. The effects of SPIO-labelling on cell viability and function were assessed in vitro. A phased-dosing protocol was used to establish the safety of intravenous administration of SPIO-labelled cells in healthy volunteers. The feasibility of imaging cells at a target site in vivo following local or systemic administration was assessed. Tracking of SPIO-labelled cells to a target site was investigated by inducing an iatrogenic inflammatory focus in the skin of the anterior thigh of healthy volunteers, following which autologous SPIO-labelled cells were administered and their accumulation was assessed using MRI scanning and histology of skin biopsies. Results Robust and semi-quantitative data acquisition and image analysis methodology was developed for the assessment of SPIO accumulation in tissues. In patients with AAA, histological analysis of aortic wall tissue samples confirmed USPIO accumulation in areas of cellular inflammation. USPIO-enhanced MRI detected aortic wall inflammation and mural USPIO uptake was associated with a 3-fold higher aneurysm expansion rate. Human mononuclear cells were labelled with SPIO under GMP compliant conditions without affecting cell viability or function. Both local and intravenous administration of SPIO-labelled cells was safe and cells were detectable in vitro and in vivo using a clinical MRI scanner. SPIO-labelled cells tracked to a focal iatrogenic inflammatory focus following intravenous administration in humans and were detectable on MRI scanning and histological examination of skin biopsies. Conclusions SPIO contrast agents have an extensive range of potential clinical applications. USPIO uptake in the wall of AAA appears to identify cellular inflammation and predict accelerated aneurysm expansion. This is therefore a promising investigative tool for stratifying the risk of disease progression in patients with AAA, and may also be considered as a biomarker for response to novel pharmacological agents. The ability to label cells for non-invasive cell tracking studies would facilitate the further development of novel cell-based therapies and would enable assessment of dynamic inflammatory processes through inflammatory cell tracking.
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Stephen, Renu M. "Magnetic Resonance Imaging Biomarkers For Targeted Cancer Therapies." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/194845.

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In 2007, there will be an estimated 178,480 new cases of breast cancer diagnosed in women in the United States. The elucidation of the vast heterogeneity of individual tumors has led to a paradigm shift from a one-size fits all treatment strategy to more individualized treatment based on the molecular profile of the tumor. Identifying biomarkers that respond to or predict the action of drugs is important in identifying efficacious targets and drugs that will improve clinical outcome. To examine this, we first identified two breast cancer cell lines (ACC-3199 and ACC-3171) from a panel of low passage breast cells lines that were capable of growing serially as tumor xenografts. This was followed by the in vivo molecular characterization of these two cell lines. In ACC-3199 tumors, we identified a gain of pAKT expression compared to cultured cells. Based on this finding, we investigated the role of diffusion-weighted (DW) and dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) as potential imaging biomarkers in identifying early response to PX-866, a PI3K inhibitor, in ACC-3199 tumors as represented by changes in tumor cellularity and hemodynamic parameters, respectively. Our results indicated that DW-MRI was able to identify an early response to PX-886 in ACC-3199 tumors as defined by an increase in the apparent diffusion coefficient (ADC) value of the tumors prior to changes in tumor volumes. Using DCE-MRI, we were able to conclude that PX-866 was not an effective anti-angiogenic agent as indicated by an increase in tumor permeability following therapy. Based on the VEGFR2 expression observed in ACC-3171 tumor xenografts, we examined the response of MDA-MB-231/GFP and ACC-3171 tumor xenografts to the anti-angiogenic agent, sunitinib, using the same imaging modalities. DW-MRI was able to detect increases in ADC values as early as 12 h post-treatment in both MDA-MB-231/GFP and ACC-3171 tumors. Thus, it appears that DW-MRI may be a useful clinical test in predicting the early response to PI3K and anti-angiogenic inhibitors. These imaging approaches, in addition to the further molecular characterization of breast tumors may lead to the improvement and development of medical therapies for breast cancer patients.
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Gray, Crawford F. "The development of magnetic resonance imaging for implant dentistry." Thesis, University of Glasgow, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250064.

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Books on the topic "Magnetic resonance imaging (MRI)"

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Feigenbaum, Ernest. Magnetic resonance imaging (MRI). Rockville, MD: U.S.Dept. of Health and Human Services, Public Health Service, National Center for Health Services Research and Health Care Technology Assessment, 1985.

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Feigenbaum, Ernest. Magnetic resonance imaging (MRI). Rockville, MD: U.S. Dept. of Health and Human Services, Public Health Service, National Center for Health Services Research and Health Care Technology Assessment, 1985.

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R, Edelman Robert, Hesselink John R, and Zlatkin Michael B, eds. MRI: Clinical magnetic resonance imaging. 2nd ed. Philadelphia: Saunders, 1996.

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Cardoza, Jim D. MRI survival guide. New York: Raven Press, 1994.

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B, Lufkin Robert, ed. Interventional MRI. St. Louis: Mosby, 1999.

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Brant, William E. Essentials of body MRI. New York: Oxford University Press, 2012.

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English, Philip T. MRI for radiographers. Berlin: Springer, 1995.

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Oldendorf, William H. MRI primer. New York: Raven Press, 1991.

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1958-, McRobbie Donald W., ed. MRI from picture to proton. Cambridge: Cambridge University Press, 2003.

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N, Morelli John, ed. Essentials of clinical MRI. New York: Thieme, 2011.

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Book chapters on the topic "Magnetic resonance imaging (MRI)"

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Flick, Herman. "MRI-spoelen." In Magnetic Resonance Imaging, 155–64. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1934-3_10.

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Zuurbier, Ria. "Het MRI-signaal." In Magnetic Resonance Imaging, 35–44. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1934-3_3.

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Zuurbier, Ria. "MRI van het hoofd." In Magnetic Resonance Imaging, 233–68. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1934-3_17.

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Zuurbier, Ria. "MRI van de wervelkolom." In Magnetic Resonance Imaging, 269–90. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1934-3_18.

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Zuurbier, Ria. "MRI van de gewrichten." In Magnetic Resonance Imaging, 291–332. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1934-3_19.

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Nahuis, Johan. "MRI van het abdomen." In Magnetic Resonance Imaging, 333–38. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1934-3_20.

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Zuurbier, Ria. "MRI van het hart." In Magnetic Resonance Imaging, 339–58. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1934-3_21.

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Boetes, Carla. "MRI van de mammae." In Magnetic Resonance Imaging, 359–72. Houten: Bohn Stafleu van Loghum, 2017. http://dx.doi.org/10.1007/978-90-368-1934-3_22.

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Vlaardingerbroek, Marinus T., and Jacques A. den Boer. "MRI and its Hardware." In Magnetic Resonance Imaging, 9–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03800-0_2.

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Vlaardingerbroek, Marinus T., and Jacques A. den Boer. "MRI and Its Hardware." In Magnetic Resonance Imaging, 9–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05252-5_2.

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Conference papers on the topic "Magnetic resonance imaging (MRI)"

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Barker, Alex J., Brant Cage, Stephen Russek, Ruchira Garg, Robin Shandas, and Conrad R. Stoldt. "Tailored Nanoscale Contrast Agents for Magnetic Resonance Imaging." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81503.

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Two potential molecular imaging vectors are investigated for material properties and magnetic resonance imaging (MRI) contrast improvement. Monodisperse magnetite (Fe3O4) nanocrystals ranging in size from 7 to 22 nm are solvothermally synthesized by thermolysis of Fe(III) acetylacetonate (Fe(AcAc)3) both with and without the use of heptanoic acid (HA) as a capping ligand. For the resulting Fe3O4 nanocrystals, X-Ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and superconducting quantum interference device magnetometry (SQUID) is used to identify the average particle size, monodispersity, crystal symmetry, and magnetic properties of the ensembles as a function of time. The characterization study indicates that the HA synthesis route at 3 hours produced nanoparticles with the greatest magnetic anisotropy (15.8 × 104 J/m3). The feasibility of Fe8 single molecule magnets (SMMs) as a potential MRI contrast agent is also examined. SQUID magnetization measurements are used to determine anisotropy and saturation of the potential agents. The effectiveness of the Fe3O4 nanocrystals and Fe8 as potential MRI molecular probes is evaluated by MRI contrast improvement using 1.5 mL phantoms dispersed in de-ionized water. Results indicate that the magnetically optimized Fe3O4 nanocrystals and Fe8 SMMs hold promise for use as contrast agents based on the reported MRI images and solution phase T1/T2 shortening.
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Meinhold, Waiman, Efe Ozkaya, Jun Ueda, and Mehmet Kurt. "Tuneable Resonance Actuators for Magnetic Resonance Elastography." In 2019 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/dmd2019-3313.

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Palpation, or physical manipulation of tissue to assess mechanical properties is one of the most prevalent and valuable clinical evaluations. Because physical interaction is needed, historically palpation has been limited to easily accessible surface level tissues. Magnetic resonance elastography (MRE) combines non-invasive Magnetic Resonance Imaging (MRI) with mechanically induced shear waves, producing the ability to map elasticity of soft tissues in vivo. Actuator design has been a limiting factor in MRE advancements. In this study, a mechanical resonator with adjustable resonant frequency was designed to be used in MRE applications. The designed piezoelectric actuator was fully MRI compatible, and capable of dynamically adjusting its resonant frequency. The purpose was to keep the displacement amplitude sufficiently large over a wide actuation frequency range. The outer stage of the amplifier contained movable side masses for tuning resonance frequency.
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Schiller, Stephan, and R. L. Byer. "Holeburning Optical Magnetic Resonance Imaging." In Persistent Spectral Hole Burning: Science and Applications. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/pshb.1991.the5.

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Scanning probe microscopy and gradient imaging are two techniques for imaging at sub-wavelength spatial resolution. Gradient imaging in the form of magnetic resonance imaging (MRI) has so far been demonstrated only in the radio- and microwave frequency domains [1]. An extension of MRI to optical frequencies for imaging (semi-) transparent objects is of interest because an optical photon detection process is inherently more sensitive than magnetic induction detection, potentially leading to increased spatial resolution. Rare-earth ions incorporated into a crystalline host are promising as a prototype system for demonstration of high spatial resolution OMRI.
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Lei, Tianhu. "Description of statistical theory of magnetic resonance imaging (MRI)." In Medical Imaging, edited by Michael J. Flynn and Jiang Hsieh. SPIE, 2006. http://dx.doi.org/10.1117/12.653635.

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Dahmen, Christian, Tim Wortmann, and Sergej Fatikow. "Magnetic Resonance Imaging of Magnetic Particles for Targeted Drug Delivery." In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13149.

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Recently there have been initial investigations towards magnetic resonance imaging (MRI) guided actuation and control of untethered devices inside the human cardiovascular system. This form of therapy has the potential to revolutionize today’s treatment of cancer and other diseases by providing an accuracy of targeted drug application far beyond conventional approaches. Additionally it is based on standard MRI hardware and does not require any special or tailored hardware. In this article, we present recent work that is focused on visual feedback for the position control of untethered magnetic devices in the MRI. For reliable recognition and tracking, a thorough understanding of the impact of magnetic material on the process of MRI image acquisition is required. A simulation of the image formation process has been implemented. Additionally, initial experimental results of MRI artifact imaging are presented.
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Wiart, Marlene, Nathalie Davoust, Jean-Baptiste Pialat, Yves Berthezene, and Norbert Nighoghossian. "Magnetic resonance imaging (MRI) of inflammation in stroke." In 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2007. http://dx.doi.org/10.1109/iembs.2007.4353291.

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Fritz, Joseph V., Peter D. Scott, and Vernice Bates. "Iterative Motion Compensation and Estimation in Magnetic Resonance Imaging (MRI)." In 1989 Medical Imaging, edited by Samuel J. Dwyer III, R. Gilbert Jost, and Roger H. Schneider. SPIE, 1989. http://dx.doi.org/10.1117/12.953243.

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Hassibi, Arjang, Aydin Babakhani, and Ali Hajimiri. "A Spectral-Scanning Magnetic Resonance Imaging (MRI) Integrated System." In 2007 IEEE Custom Integrated Circuits Conference. IEEE, 2007. http://dx.doi.org/10.1109/cicc.2007.4405695.

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Vaughan, J., Carl Snyder, Lance DelaBarre, Jinfeng Tian, Can Akgun, Kamil Ugurbil, Chris Olson, and Anand Gopinath. "Current and Future Trends in Magnetic Resonance Imaging (MRI)." In 2006 IEEE MTT-S International Microwave Symposium Digest. IEEE, 2006. http://dx.doi.org/10.1109/mwsym.2006.249451.

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Meça, Alba. "Applications of Deep Learning to Magnetic Resonance Imaging (MRI)." In 2023 International Conference on Computing, Electronics & Communications Engineering (iCCECE). IEEE, 2023. http://dx.doi.org/10.1109/iccece59400.2023.10238598.

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Reports on the topic "Magnetic resonance imaging (MRI)"

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Schweizer, M. Developments in boron magnetic resonance imaging (MRI). Office of Scientific and Technical Information (OSTI), November 1995. http://dx.doi.org/10.2172/421332.

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Evanochko, William T. Philips 3T Intera Magnetic Resonance Imaging System and Upgrade of existing MRI equipment. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/834766.

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de Sousa, Eduardo, Renata Matsui, Leonardo Boldrini, Leandra Baptista, and José Mauro Granjeiro. Mesenchymal stem cells for the treatment of articular cartilage defects of the knee: an overview of systematic reviews. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, December 2022. http://dx.doi.org/10.37766/inplasy2022.12.0114.

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Review question / Objective: Population: adults (aged between 18 and 50 years) with traumatic knee lesions who underwent treatment with mesenchymal stem cells; Intervention: defined by the treatment with mesenchymal stem cells; The comparison group: treatment with autologous chondrocytes or microfracture treatments; Primary outcome: formation of cartilage neo tissue in the defect area, determined by magnetic resonance imaging (MRI) or by direct visualization in second-look knee arthroscopy.; Secondary outcomes: based on clinical scores such as visual analog scale (VAS) for pain, Western Ontario and McMaster universities score (WOMAC), knee society score (KSS), Tegner and Lysholm.
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Bonnekoh, Linda, Angela Rölver, Ida Wessing, Navid Schürmeyer, Susanne Meinert, Udo Dannlowski, and Georg Romer. Brain Magnetic resonance imaging (MRI) findings in adolescents with gender incongruence and gender dysphoria and non-binary identifying adolescents: a scoping review protocol. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, November 2023. http://dx.doi.org/10.37766/inplasy2023.11.0074.

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Thomas Austin, Evan, Paul Kang, Chinedu Mmeje, Joseph Mashni, Mark Brenner, Phillip Koo, and John C Chang. Validation of PI-RADS v2 Scores at Various Non-University Radiology Practices. Science Repository, December 2021. http://dx.doi.org/10.31487/j.aco.2021.02.02.

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Purpose: The purpose of this study was to validate the second version of the Prostate Imaging Reporting and Data System (PI-RADSv2) scores in predicting positive in-bore MRI-guided targeted prostate biopsy results across different non-university related institutions. The study focuses on PI-RADS v2 scoring because during the study period, PI-RADS v2.1 had not been released. Materials and Methods: This was a retrospective review of 147 patients who underwent multiparametric magnetic resonance imaging (mpMRI) of the pelvis followed by in-bore MRI-guided targeted prostate biopsy from December 2014 to May 2018. All lesions on mpMRI were rated according to PI-RADS v2 criteria. PI-RADS v2 scores were then compared to MR-guided biopsy results and pre-biopsy PSA values. Results: Prostate Cancer (PCa) was detected in 54% (80/147) of patients, with more prostate cancer being detected with each subsequent increase in PI-RADS scores. Specifically, biopsy results in patients with PI-RADS 3, 4, and 5 lesions resulted in PCa in 25.6% (10/39), 58.1% (33/55), and 86.0% (37/43) respectively. Clinically significant PCa (Gleason score ≥7) was detected in 17.9% (7/39), 52.7% (29/55), and 72% (31/43) of cases for PI-RADS 3, 4, and 5 lesions respectively. When the PI-RADS scoring and biopsy results were compared across different institutions, there was no difference in the PI-RADS scoring of lesions or in the positive biopsy rates of the lesions. The sensitivity, specificity, PPV, and NPV for PI-RADS 3-4 lesions were also not statistically different across the institutions for detecting Gleason 7 or greater lesions. Conclusion: Our results agree with prior studies that higher PI-RADS scores are associated with the presence of clinically significant PCa and suggest prostate lesions with PI-RADS scores 3-5 have sufficient evidence to warrant targeted biopsy. The comparison of PI-RADS score across different types of non-university practices revealed no difference in scoring and biopsy outcome, suggesting that PI-RADS v2 can be easily applied outside of the university medical center setting. Clinical Relevance: PI-RADS v2 can be applied homogeneously in the non-university setting without significant difference in outcome.
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Wu, Xin. The efficacy and safety of anti-CD20 antibody treatments in relapsing multiple sclerosis: a systematic review and network meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, June 2022. http://dx.doi.org/10.37766/inplasy2022.6.0075.

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Review question / Objective: The objectives of this systematic review were to evaluate the efficacy and safety of the three existing anti-CD20 antibodies for the treatment of relapsing multiple sclerosis and to aid clinicians in choosing medications. Eligibility criteria: We set the inclusion criteria as follows: (1) study type: RCT; (2) language restriction: only available in English; (3) participants: patients ≥18 years of age diagnosed with relapsing MS, whether with a relapsing–remitting course or a secondary progressive course; (4) intervention: anti-CD20 antibody treatments including ocrelizumab, ofatumumab, rituximab, and corresponding control including placebo and active treatments; (5) outcomes: clinical outcomes including annualized rate of relapse (ARR), the number of patients free of relapse, and the number of patients with confirmed disease progression (CDP); magnetic resonance imaging(MRI) outcomes including gadolinium-enhancing lesion change in T1, change in the volume of lesions on T2, the number of patients with no new or newly enlarged lesions in T2 and the brain volume change (BVC); safety outcomes including adverse events (AEs) and serious adverse events (SAEs). Included RCTs were not requested to supply all the outcomes mentioned above. We set the exclusion criteria as follows: (1) study type: retrospective studies, cohort studies, case reviews and case reports; (2) patients diagnosed with primary progressive MS.
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Russek, Stephen E. Magnetic Resonance Imaging Biomarker Calibration Service:. Gaithersburg, MD: National Institute of Standards and Technology, 2022. http://dx.doi.org/10.6028/nist.sp.250-100.

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Schmidt, D. M., and M. A. Espy. Low-field magnetic resonance imaging of gases. Office of Scientific and Technical Information (OSTI), November 1998. http://dx.doi.org/10.2172/674672.

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Bronskill, Michael J., Paul L. Carson, Steve Einstein, Michael Koshinen, Margit Lassen, Seong Ki Mun, William Pavlicek, et al. Site Planning for Magnetic Resonance Imaging Systems. AAPM, 1986. http://dx.doi.org/10.37206/19.

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Budakian, Raffi. Nanometer-Scale Force Detected Nuclear Magnetic Resonance Imaging. Fort Belvoir, VA: Defense Technical Information Center, January 2013. http://dx.doi.org/10.21236/ada591583.

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