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Magnetic resonance physics

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https://www.readbyqxmd.com/read/28226714/a-unified-bayesian-based-compensated-magnetic-resonance-imaging
#1
Ameneh Boroomand, Edward Li, Mohammad Javad Shafiee, Masoom A Haider, Farzad Khalvati, Alexander Wong, Ameneh Boroomand, Edward Li, Mohammad Javad Shafiee, Masoom A Haider, Farzad Khalvati, Alexander Wong, Alexander Wong, Mohammad Javad Shafiee, Edward Li, Masoom A Haider, Ameneh Boroomand, Farzad Khalvati
Magnetic resonance (MR) images of higher quality is demanded for helping with more accurate and earlier diagnosis of different diseases. The overall quality of MR images is limited due to the existence of different degradation factors such as (1) MR aberrations due to intrinsic properties of the MR scanner, (2) magnetic field inhomogeneity, and (3) inherent MRI noise. Correcting each MRI degradation factor could be solely useful for the quality enhancement of MR imaging with a limited impact. Here, we propose a unified Bayesian based compensated MR imaging (CMRI) system which jointly corrects for the different aforementioned MR aberrations as well as MR noise and hence generates compensated MR (CMR) images with a higher quality...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226678/hip-segmentation-from-mri-volumes-in-infants-for-ddh-diagnosis-and-treatment-planning
#2
Abhilash Rakkunedeth Hareendranathan, Dornoosh Zonoobi, Myles Mabee, Chad Diederichs, Kumaradevan Punithakumar, Michelle Noga, Jacob L Jaremko, Abhilash Rakkunedeth Hareendranathan, Dornoosh Zonoobi, Myles Mabee, Chad Diederichs, Kumaradevan Punithakumar, Michelle Noga, Jacob L Jaremko, Jacob L Jaremko, Myles Mabee, Dornoosh Zonoobi, Michelle Noga, Chad Diederichs, Kumaradevan Punithakumar, Abhilash Rakkunedeth Hareendranathan
Diagnosis and surgical management of Developmental Dysplasia of the Hip (DDH) relies on physical examination and 2D ultrasound scanning. Magnetic Resonance Imaging (MRI) can be used to complement existing techniques and could be advantageous in treatment planning due to its larger field of view. In this paper we propose a semi-automatic method to segment surface models of the acetabulum from MRI images. The method incorporates clinical knowledge in the form of intensity priors which are integrated into a Random Walker (RW) formulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226530/low-rank-magnetic-resonance-fingerprinting
#3
Gal Mazor, Lior Weizman, Assaf Tal, Yonina C Eldar, Gal Mazor, Lior Weizman, Assaf Tal, Yonina C Eldar, Gal Mazor, Assaf Tal, Lior Weizman, Yonina C Eldar
Magnetic Resonance Fingerprinting (MRF) is a relatively new approach that provides quantitative MRI using randomized acquisition. Extraction of physical quantitative tissue values is preformed off-line, based on acquisition with varying parameters and a dictionary generated according to the Bloch equations. MRF uses hundreds of radio frequency (RF) excitation pulses for acquisition, and therefore high under-sampling ratio in the sampling domain (k-space) is required. This under-sampling causes spatial artifacts that hamper the ability to accurately estimate the quantitative tissue values...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225578/detection-of-volume-alterations-in-hippocampal-subfields-of-rats-under-chronic-unpredictable-mild-stress-using-7t-mri-a-follow-up-study
#4
Yuefeng Li, Xiaolan Zhu, Shenghong Ju, Jinchuan Yan, Dongqing Wang, Yan Zhu, Fengchao Zang
PURPOSE: To determine hippocampal subfields volume loss in depression, which was simulated by a rat chronic unpredictable mild stress (CUMS) model. As different cellular and molecular characteristics in hippocampal subfields, these subfields are regarded as differentially vulnerable to processes associated with stress. MATERIALS AND METHODS: Twenty male Wistar rats were exposed to various stressors until the model was successfully established. The effects of physical exercise on recovery of hippocampal volume in depressed rats were simulated using the wheel running test (WRT)...
February 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28223802/fe3o4-based-plga-nanoparticles-as-mr-contrast-agents-for-the-detection-of-thrombosis
#5
Jia Liu, Jie Xu, Jun Zhou, Yu Zhang, Dajing Guo, Zhigang Wang
Thrombotic disease is a great threat to human health, and early detection is particularly important. Magnetic resonance (MR) molecular imaging provides noninvasive imaging with the potential for early disease diagnosis. In this study, we developed Fe3O4-based poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) surface-modified with a cyclic Arg-Gly-Asp (cRGD) peptide as an MR contrast agent for the detection of thrombosis. The physical and chemical characteristics, biological toxicity, ability to target thrombi, and biodistribution of the NPs were studied...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28221303/a-case-of-asymptomatic-inclusion-body-myositis
#6
Rey Bello, Tulio Bertorini, Kartheek Ganta, William Mays
OBJECTIVES: To present a case of asymptomatic inclusion body myositis. METHODS: The authors report a case of a 67-year-old man who presented with idiopathic hyperCKemia. Physical examination including a complete neurological evaluation was unremarkable. Systemic causes of hyperCKemia, including medication side effects, metabolic and endocrine disorders, and connective tissue disorders, were ruled out with various indicated tests. RESULTS: Two and a half years after initial consultation, the patient reported left knee pain...
March 2017: Journal of Clinical Neuromuscular Disease
https://www.readbyqxmd.com/read/28219995/magnetic-field-concentration-assisted-by-epsilon-near-zero-media
#7
Iñigo Liberal, Yue Li, Nader Engheta
Strengthening the magnetic response of matter at optical frequencies is of fundamental interest, as it provides additional information in spectroscopy, as well as alternative mechanisms to manipulate light at the nanoscale. Here, we demonstrate theoretically that epsilon-near-zero (ENZ) media can enhance the magnetic field concentration capabilities of dielectric resonators. We demonstrate that the magnetic field enhancement factor is unbounded in theory, and it diverges as the size of the ENZ host increases...
March 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28218772/diagnosis-and-management-of-abdominal-wall-endometriosis-a-systematic-review-and-clinical-recommendations
#8
Noah B Rindos, Suketu Mansuria
Importance: Abdominal wall endometriosis (AWE) is a rare but easily treated cause of pain in women, especially those who have undergone cesarean deliveries. Objective: This article reviews the diagnosis and management of AWE, a condition that generally develops after surgery but may arise spontaneously. We present a systematic review of the existing literature on AWE, as well as our clinical recommendations for medical and surgical management. Evidence Acquisition: We searched PubMed and other databases using the search criteria "abdominal wall endometriosis," "abdominal wall endometriomas," and "abdominal wall mass...
February 2017: Obstetrical & Gynecological Survey
https://www.readbyqxmd.com/read/28218615/electronic-properties-of-superlattices-on-quantum-rings
#9
Diego Rabelo da Costa, Andrey Chaves, W Ferreira, Gil Farias, Robson Ferreira
We present a theoretical study of the one-electron states of a semiconductors-made quantum ring (QR) containing a series of piecewise-constants wells and barriers distributed along the ring circumference. The single quantum well and the superlattice cases are considered in detail. We also investigate how such confining potentials affect the Aharonov-Bohm like oscillations of the energy spectrum and current in the presence of a magnetic field. The model is simple enough so as to allow obtaining various analytical or quasi-analytical results...
February 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28216208/a-rare-case-of-pediatric-lumbar-spinal-ependymoma-mimicking-meningitis
#10
Ezeali Mike Ekuma, Kiyoshi Ito, Akihiro Chiba, Yosuke Hara, Kohei Kanaya, Tetsuyoshi Horiuchi, Samuel Ohaegbulam, Kazuhiro Hongo
Spontaneous acute subarachnoid hemorrhage (SAH) from lumbar ependymoma in children is rare. We report a case of a14-year-old boy who developed sudden radicular low back pain while playing baseball. He was initially managed conservatively in a local hospital for suspected lumbar disc herniation, but later developed meningeal symptoms and fever before being referred to our hospital. There he underwent a diagnostic lumbar puncture in the emergency room; his cerebrospinal fluid suggested an SAH. Physical examination showed meningeal signs and cauda equina features...
February 12, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28214544/can-functional-magnetic-resonance-imaging-studies-help-with-the-optimization-of-health-messaging-for-lifestyle-behavior-change-a-systematic-review
#11
REVIEW
Maxine E Whelan, Paul S Morgan, Lauren B Sherar, Mark W Orme, Dale W Esliger
Unhealthy behaviors, including smoking, poor nutrition, excessive alcohol consumption, physical inactivity and sedentary lifestyles, are global risk factors for non-communicable diseases and premature death. Functional magnetic resonance imaging (fMRI) offers a unique approach to optimize health messages by examining how the brain responds to information relating to health. Our aim was to systematically review fMRI studies that have investigated variations in brain activation in response to health messages relating to (i) smoking; (ii) alcohol consumption; (iii) physical activity; (iv) diet; and (v) sedentary behavior...
February 15, 2017: Preventive Medicine
https://www.readbyqxmd.com/read/28214496/new-diagnostic-modalities-in-the-evaluation-of-lymphedema
#12
REVIEW
Thomas F O'Donnell, John C Rasmussen, Eva M Sevick-Muraca
OBJECTIVE: Currently, lymphedema (LED) is typically diagnosed clinically on the basis of a patient's history and characteristic physical findings. Whereas the diagnosis of LED is sometimes confirmed by lymphoscintigraphy (LSG), the technique is limited in both its ability to identify disease and to guide therapy. Recent advancements provide opportunities for new imaging techniques not only to assist in the diagnosis of LED, based on anatomic changes, but also to assess contractile function and to guide therapeutic intervention...
March 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28214465/acute-and-chronic-lateral-ankle-instability-diagnosis-management-and-new-concepts
#13
Rachel Shakked, Steven Sheskier
Lateral ankle instability is a common entity that can result in degenerative arthritis if left untreated. Acute ligament injuries should primarily be treated nonoperatively with a course of physical therapy and functional bracing. Chronic ankle instability is defined as mechanical or functional and can be diagnosed using a combination of history, physical examination, stress radiographs, and magnetic resonance imaging. After failure of nonoperative treatment, surgical treatment with anatomic ligament repair and inferior extensor retinaculum augmentation has the best clinical outcomes...
January 2017: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/28212385/the-effect-of-tumour-size-on-drug-transport-and-uptake-in-3-d-tumour-models-reconstructed-from-magnetic-resonance-images
#14
Wenbo Zhan, Wladyslaw Gedroyc, Xiao Yun Xu
Drug transport and its uptake by tumour cells are strongly dependent on tumour properties, which vary in different types of solid tumours. By simulating the key physical and biochemical processes, a numerical study has been carried out to investigate the transport of anti-cancer drugs in 3-D tumour models of different sizes. The therapeutic efficacy for each tumour is evaluated by using a pharmacodynamics model based on the predicted intracellular drug concentration. Simulation results demonstrate that interstitial fluid pressure and interstitial fluid loss vary non-linearly with tumour size...
2017: PloS One
https://www.readbyqxmd.com/read/28211647/clinical-characteristics-predicting-abnormal-brain-magnetic-resonance-image-findings-in-hypoxic-ischemic-encephalopathy-infants
#15
Sook K Yum, Cheong-Jun Moon, Young-Ah Youn, In K Sung
BACKGROUND: The aim of this study was to elucidate the specific clinical characteristics associated with abnormal brain magnetic resonance image(MRI) findings in hypoxic ischemic encephalopathy(HIE) infants in order to discern how to predict poorer outcomes more accurately. METHODS: A retrospective data analysis of HIE infants admitted to the neonatal intensive care unit of a tertiary hospital was performed. Baseline perinatal information and physical and neurological findings were compared in HIE infants according to the presence of abnormal brain MRI findings...
February 17, 2017: Minerva Pediatrica
https://www.readbyqxmd.com/read/28210658/patellar-maltracking-persists-in-adolescent-females-with-patellofemoral-pain-a-longitudinal-study
#16
Victor R Carlson, Barry P Boden, Aricia Shen, Jennifer N Jackson, Katharine E Alter, Frances T Sheehan
BACKGROUND: Patellofemoral pain is one of the most common conditions seen in sports medicine practices, particularly among adolescent females. However, the natural history of the underlying pathology in patellofemoral pain during puberty remains poorly understood. PURPOSE: The purpose of this longitudinal study is to assess changes in patellar maltracking patterns in subjects with patellofemoral pain as they mature from mid- to late adolescence. STUDY DESIGN: Cohort study; Level of evidence, 3...
February 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28209767/ideal-cardiovascular-health-cardiovascular-remodeling-and-heart-failure-in-blacks-the-jackson-heart-study
#17
Aferdita Spahillari, Sameera Talegawkar, Adolfo Correa, J Jeffrey Carr, James G Terry, João Lima, Jane E Freedman, Saumya Das, Robb Kociol, Sarah de Ferranti, Donya Mohebali, Stanford Mwasongwe, Katherine L Tucker, Venkatesh L Murthy, Ravi V Shah
BACKGROUND: The lifetime risk of heart failure (HF) is higher in the black population than in other racial groups in the United States. METHODS AND RESULTS: We measured the Life's Simple 7 ideal cardiovascular health metrics in 4195 blacks in the JHS (Jackson Heart Study; 2000-2004). We evaluated the association of Simple 7 metrics with incident HF and left ventricular structure and function by cardiac magnetic resonance (n=1188). Mean age at baseline was 54.4 years (65% women)...
February 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/28208606/ustiloxin-g-a-new-cyclopeptide-mycotoxin-from-rice-false-smut-balls
#18
Xiaohan Wang, Jian Wang, Daowan Lai, Weixuan Wang, Jungui Dai, Ligang Zhou, Yang Liu
Ustiloxins were cyclopeptide mycotoxins from rice false smut balls (FSBs) that formed in rice spikelets infected by the fungal pathogen Ustilaginoidea virens. To investigate the chemical diversity of these metabolites and their bioactivities, one new cyclopeptide, ustiloxin G (1), together with four known congeners-ustiloxins A (2), B (3), D (4), and F (5)-were isolated from water extract of rice FSBs. Their structures were elucidated by analyses of their physical and spectroscopic data, including ultraviolet spectrometry (UV), infrared spectroscopy (IR), 1D and 2D nuclear magnetic resonance (NMR), and high-resolution electrospray ionization-mass spectrometry (HR-ESI-MS)...
February 10, 2017: Toxins
https://www.readbyqxmd.com/read/28205489/quadrilateral-space-syndrome-a-case-report
#19
Takuya Sato, Tsai-Lung Tsai, Anas Altamimi, Tsu-Min Tsai
We present a case of quadrilateral space syndrome (QSS) in a patient with left arm pain. The patient sustained a trauma to his left arm, and QSS was successfully diagnosed by physical examination, magnetic resonance image, electromyographic evaluation, and nerve conduction studies. Surgery was performed to decompress the axillary nerve and the patient recovered fully with minimal residual symptoms.
March 2017: Journal of Hand Surgery Asian-Pacific Volume
https://www.readbyqxmd.com/read/28201839/mr-imaging-in-patients-with-cardiac-pacemakers-and-implantable-cardioverter-defibrillators
#20
Torsten Sommer, Wolfgang Bauer, Katharina Fischbach, Christof Kolb, Roger Luechinger, Uwe Wiegand, Joachim Lotz, Ingo Eitel, Matthias Gutberlet, Holger Thiele, Hans H Schild, Malte Kelm, Harald H Quick, Jeanette Schulz-Menger, Jörg Barkhausen, Dietmar Bänsch
This joint consensus paper of the German Roentgen Society and the German Cardiac Society provides physical and electrophysiological background information and specific recommendations for the procedural management of patients with cardiac pacemakers (PM) and implantable cardioverter defibrillators (ICD) undergoing magnetic resonance (MR) imaging. The paper outlines the responsibilities of radiologists and cardiologists regarding patient education, indications, and monitoring with modification of MR sequences and PM/ICD reprogramming strategies being discussed in particular...
February 15, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
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