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Susceptibility Weighted Imaging

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https://www.readbyqxmd.com/read/28210800/preservation-of-the-endometrial-enhancement-after-magnetic-resonance-imaging-guided-high-intensity-focused-ultrasound-ablation-of-submucosal-uterine-fibroids
#1
Young-Sun Kim, Tae-Joong Kim, Hyo Keun Lim, Hyunchul Rhim, Sin-Ho Jung, Joong Hyun Ahn, Jeong-Won Lee, Byoung-Gie Kim
OBJECTIVE: To evaluate the integrity of endometrial enhancement after magnetic resonance imaging-guided high-intensity focused ultrasound (MR-HIFU) ablation of submucosal uterine fibroids based on contrast-enhanced MRI findings, and to identify the risk factors for endometrial impairment. METHODS: In total, 117 submucosal fibroids (diameter: 5.9 ± 3.0 cm) in 101 women (age: 43.6 ± 4.4 years) treated with MR-HIFU ablation were retrospectively analysed...
February 16, 2017: European Radiology
https://www.readbyqxmd.com/read/28207389/an-efficient-reconstruction-algorithm-based-on-the-alternating-direction-method-of-multipliers-for-joint-estimation-of-r2-and-off-resonance-in-fmri
#2
Chenxi Hu, Stanley Reeves, Dana Peters, Donald Twieg
R 2 mapping is a useful tool in blood-oxygen-level dependent (BOLD) fMRI due to its quantitative nature. However, like T 2 -weighted imaging, standard R 2 mapping based on multiecho EPI suffers from geometric distortion, due to strong offresonance near the air-tissue interface. Joint mapping of R 2 and off-resonance can correct the geometric distortion and is less susceptible to motion artifacts. Single-shot joint mapping of R 2 and off-resonance is possible with a rosette trajectory due to its frequent sampling of the k-space center...
February 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28207200/a-pet-guided-framework-supports-a-multiple-arterial-input-functions-approach-in-dsc-mri-in-acute-stroke
#3
Michelle Livne, Vince I Madai, Peter Brunecker, Olivier Zaro-Weber, Walter Moeller-Hartmann, Wolf-Dieter Heiss, Kim Mouridsen, Jan Sobesky
BACKGROUND AND PURPOSE: In acute stroke, arterial-input-function (AIF) determination is essential for obtaining perfusion estimates with dynamic susceptibility-weighted contrast-enhanced magnetic resonance imaging (DSC-MRI). Standard DSC-MRI postprocessing applies single AIF selection, ie, global AIF. Physiological considerations, however, suggest that a multiple AIFs selection method would improve perfusion estimates to detect penumbral flow. In this study, we developed a framework based on comparable DSC-MRI and positron emission tomography (PET) images to compare the two AIF selection approaches and assess their performance in penumbral flow detection in acute stroke...
February 16, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28196123/correction-cerebral-hemodynamics-in-patients-with-hemolytic-uremic-syndrome-assessed-by-susceptibility-weighted-imaging-and-four-dimensional-non-contrast-mr-angiography
#4
Ulrike Löbel, Nils Daniel Forkert, Peter Schmitt, Thorsten Dohrmann, Maria Schroeder, Tim Magnus, Stefan Kluge, Christina Weiler-Normann, Xiaoming Bi, Jens Fiehler, Jan Sedlacik
[This corrects the article DOI: 10.1371/journal.pone.0164863.].
2017: PloS One
https://www.readbyqxmd.com/read/28188873/an-improved-fsl-first-pipeline-for-subcortical-gray-matter-segmentation-to-study-abnormal-brain-anatomy-using-quantitative-susceptibility-mapping-qsm
#5
Xiang Feng, Andreas Deistung, Michael G Dwyer, Jesper Hagemeier, Paul Polak, Jessica Lebenberg, Frédérique Frouin, Robert Zivadinov, Jürgen R Reichenbach, Ferdinand Schweser
Accurate and robust segmentation of subcortical gray matter (SGM) nuclei is required in many neuroimaging applications. FMRIB's Integrated Registration and Segmentation Tool (FIRST) is one of the most popular software tools for automated subcortical segmentation based on T1-weighted (T1w) images. In this work, we demonstrate that FIRST tends to produce inaccurate SGM segmentation results in the case of abnormal brain anatomy, such as present in atrophied brains, due to a poor spatial match of the subcortical structures with the training data in the MNI space as well as due to insufficient contrast of SGM structures on T1w images...
February 7, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28182304/benign-prostatic-hyperplasia-after-prostatic-arterial-embolization-in-a-canine-model-a-3t-multiparametric-mri-and-whole-mount-step-section-pathology-correlated-longitudinal-study
#6
Basen Li, Anhui Xu, Nan Wang, Xiangde Min, Zhaoyan Feng, Ming Deng, Liang Li, Jie Cai, Zhen Kang, Kehua Jiang, Dong Kuang, Liang Wang
PURPOSE: To explore the morphological and functional characteristics of prostatic arterial embolization (PAE) in a canine model of benign prostatic hyperplasia (BPH) with 3T multiparametric magnetic resonance imaging (mp-MRI) and whole-mount step-section pathology correlation. MATERIALS AND METHODS: Eight adult male beagle dogs with hormone-induced BPH underwent 3T mp-MRI before and 1, 3, and 6 months after PAE, with subsequent whole-mount step-section pathologic assessment...
February 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28178170/use-of-susceptibility-weighted-imaging-in-assessing-ischemic-penumbra-a-case-report
#7
Xiujuan Wu, Song Luo, Ying Wang, Yang Chen, Jun Liu, Jing Bai, Jiachun Feng, Hongliang Zhang
RATIONALE: The ischemic penumbra assessment is essential for the subsequent therapy and prediction of evolution in patients with acute ischemic infraction. Although controversial as a perfect equivalence to penumbra, perfusion-weighted imaging (PWI)-diffusion-weighted imaging (DWI) mismatch may predict the response to thrombolysis. Due to the reliance of PWI on contrast agents, noninvasive alternatives remain an unmet need. PATIENT CONCERNS: We reported a 65-year-old man complained of paroxysmal hemiplegia of his right limbs and anepia for 2 days, whereas the symptoms lasted for about 12 hours when he admitted to the hospital...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28170136/intracranial-posterior-circulation-large-artery-thrombi-visualized-using-susceptibility-weighted-mri
#8
Naidong Wang, Qimin Hu, Qiaoshu Wang, Jinglong Zhao, Nikita Dedhia, Louis R Caplan
PURPOSE: To identify thrombi in patients with posterior circulation large artery occlusion using susceptibility-weighted magnetic resonance imaging (MRI). METHODS: All patients hospitalized with intracranial posterior circulation occlusion from January 2003 to September 2013 were included. MRI and computed tomography angiography were reviewed to determine the presence of arterial occlusion and identify thrombi. Eighty-one patients were analyzed to investigate susceptibility vessel sign (SVS) that was identified as blooming artifact (BA) on T2*-weighted gradient echo imaging...
February 7, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28162166/-difference-in-imaging-and-metal-metabolism-between-hepatic-and-cerebral-type-wilson-disease
#9
X X Zhou, X H Li, X Y Pu, H L Qin, X B Li, J P Chu, Z Y Yang, H W Huang, X L Liang
Objective: To evaluate the difference of metal metabolism, damage to structure and functional activity in brains between hepatic and cerebral type Wilson disease (WD). Methods: Forty patients with WD, including 20 with cerebral type and 20 with hepatic type, and 20 age-matched healthy controls in the First Affiliated Hospital, Sun Yat-sen University between Jul 2013 and May 2016 were enrolled.All study subjects underwent diffusion tensor imaging (DTI), resting state functional MRI (rs-fMRI) and susceptibility weighted imaging (SWI) of the brain...
January 17, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28151734/rapid-diffusion-weighted-magnetic-resonance-imaging-of-the-brain-without-susceptibility-artifacts-single-shot-steam-with-radial-undersampling-and-iterative-reconstruction
#10
Andreas Merrem, Sabine Hofer, Dirk Voit, K-Dietmar Merboldt, Jakob Klosowski, Markus Untenberger, Julius Fleischhammer, Jens Frahm
OBJECTIVE: The aim of this study was to develop a rapid diffusion-weighted (DW) magnetic resonance imaging (MRI) technique for whole-brain studies without susceptibility artifacts and measuring times below 3 minutes. MATERIALS AND METHODS: The proposed method combines a DW spin-echo module with a single-shot stimulated echo acquisition mode MRI sequence. Previous deficiencies in image quality due to limited signal-to-noise ratio are compensated for (1) by radial undersampling to enhance the flip angle and thus the signal strength of stimulated echoes; (2) by defining the image reconstruction as a nonlinear inverse problem, which is solved by the iteratively regularized Gauss-Newton method; and (3) by denoising with use of a modified nonlocal means filter...
February 1, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28149758/defining-the-endpoints-how-to-measure-the-efficacy-of-drugs-that-are-active-against-central-nervous-system-metastases
#11
REVIEW
Alessandra Fabi, Antonello Vidiri
Brain metastases (BMs) are the most common cause of malignant central nervous system (CNS) tumors in adults. In the recent past, patients with BMs were excluded from clinical trials, but now, with the advent of new biological and immunological drugs, their inclusion is more common. In the last era response and progression criteria used across clinical trials have defined the importance to consider not only measurement changes of brain lesions but also the modification of parameters related to the metastases such as metabolism of tissue and its pathological features...
December 2016: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/28143574/feasibility-of-real-time-mr-thermal-dose-mapping-for-predicting-radiofrequency-ablation-outcome-in-the-myocardium-in-vivo
#12
Solenn Toupin, Pierre Bour, Matthieu Lepetit-Coiffé, Valéry Ozenne, Baudouin Denis de Senneville, Rainer Schneider, Alexis Vaussy, Arnaud Chaumeil, Hubert Cochet, Frédéric Sacher, Pierre Jaïs, Bruno Quesson
BACKGROUND: Clinical treatment of cardiac arrhythmia by radiofrequency ablation (RFA) currently lacks quantitative and precise visualization of lesion formation in the myocardium during the procedure. This study aims at evaluating thermal dose (TD) imaging obtained from real-time magnetic resonance (MR) thermometry on the heart as a relevant indicator of the thermal lesion extent. METHODS: MR temperature mapping based on the Proton Resonance Frequency Shift (PRFS) method was performed at 1...
January 25, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28139701/the-value-of-resting-state-functional-mri-in-subacute-ischemic-stroke-comparison-with-dynamic-susceptibility-contrast-enhanced-perfusion-mri
#13
Ling Ni, Jingwei Li, Weiping Li, Fei Zhou, Fangfang Wang, Christopher G Schwarz, Renyuan Liu, Hui Zhao, Wenbo Wu, Xin Zhang, Ming Li, Haiping Yu, Bin Zhu, Arno Villringer, Yufeng Zang, Bing Zhang, Yating Lv, Yun Xu
To evaluate the potential clinical value of the time-shift analysis (TSA) approach for resting-state fMRI (rs-fMRI) blood oxygenation level-dependent (BOLD) data in detecting hypoperfusion of subacute stroke patients through comparison with dynamic susceptibility contrast perfusion weighted imaging (DSC-PWI). Forty patients with subacute stroke (3-14 days after neurological symptom onset) underwent MRI examination. Cohort A: 31 patients had MRA, DSC-PWI and BOLD data. Cohort B: 9 patients had BOLD and MRA data...
January 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28137548/intraoperative-mr-imaging-of-cerebral-oxygen-metabolism-during-resection-of-brain-lesions
#14
REVIEW
Andreas Stadlbauer, Andreas Merkel, Max Zimmermann, Björn Sommer, Michael Buchfelder, Anke Meyer-Bäse, Karl Rössler
OBJECTIVE: Tissue oxygen tension is an important parameter for brain tissue viability and its non-invasive intraoperative monitoring in the whole brain is of highly clinical relevance. The purpose of this study was the introduction of a multiparametric quantitative blood oxygenation dependent (qBOLD) MRI approach for intraoperative examination of oxygen metabolism during the resection of brain lesions. METHODS: Sixteen patients suffering from brain lesions were intraoperatively examined twice (before craniotomy and after gross-total resection) using the qBOLD technique and a 1...
January 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28123513/wilson-s-disease-patient-with-iron-metabolism-discharge-barriers-a-case-report
#15
Guoen Cai, Xinming Huang, Qinyong Ye, Wenting Xiong, Qing Duan
Wilson's disease (WD) is an autosomal genetic disease. In the present study, the patient was a 35-year-old woman who exhibited drinking bucking (bulbar paralysis) and dysphagia for a period of nine years. Genetic analysis of the patient identified the Thr935Met and Pro992Leu mutations, which lead to copper metabolism discharge barriers. Moreover, magnetic resonance imaging revealed a susceptibility-weighted imaging (SWI) hyperintense area in the bilateral substantia nigra and lenticular nuclei. These SWI observations indicated that 'mineral deposits' were present...
January 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28114441/assessment-of-early-evidence-of-multiple-sclerosis-in-a-prospective-study-of-asymptomatic-high-risk-family-members
#16
Zongqi Xia, Sonya U Steele, Anshika Bakshi, Sarah R Clarkson, Charles C White, Matthew K Schindler, Govind Nair, Blake E Dewey, Lauren R Price, Joan Ohayon, Lori B Chibnik, Irene C M Cortese, Philip L De Jager, Daniel S Reich
Importance: Subclinical inflammatory demyelination and neurodegeneration often precede symptom onset in multiple sclerosis (MS). Objective: To investigate the prevalence of brain magnetic resonance imaging (MRI) and subclinical abnormalities among asymptomatic individuals at risk for MS. Design, Setting, and Participants: The Genes and Environment in Multiple Sclerosis (GEMS) project is a prospective cohort study of first-degree relatives of people with MS...
January 17, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28113841/quantitative-susceptibility-mapping-using-structural-feature-based-collaborative-reconstruction-sfcr-in-the-human-brain
#17
Lijun Bao, Xu Li, Congbo Cai, Zhong Chen, Peter van Zijl
The reconstruction of MR quantitative susceptibility mapping (QSM) from local phase measurements is an ill posed inverse problem and different regularization strategies incorporating a priori information extracted from magnitude and phase images have been proposed. However, the anatomy observed in magnitude and phase images does not always coincide spatially with that in susceptibility maps, which could give erroneous estimation in the reconstructed susceptibility map. In this paper, we develop a structural feature based collaborative reconstruction (SFCR) method for QSM including both magnitude and susceptibility based information...
March 22, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28106942/assessment-of-intracranial-meningioma-associated-calcifications-using-susceptibility-weighted-mri
#18
Lisa C Adams, Sarah M Böker, Yvonne Y Bender, Eva M Fallenberg, Moritz Wagner, Ralph Buchert, Bernd Hamm, Marcus R Makowski
PURPOSE: To determine the diagnostic accuracy of susceptibility-weighted MRI (SW-MRI) for the detection of intracranial meningioma-associated calcifications compared with standard MR sequences, using computed tomography (CT) as a reference standard. MATERIALS AND METHODS: 354 patients, who had received both a CT and a 1.5 Tesla clinical brain MRI with SW-MRI sequences between January 2014 and July 2016, were retrospectively evaluated and 316 patients were included...
January 20, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28105503/using-swallow-tail-sign-and-putaminal-hypointensity-as-biomarkers-to-distinguish-multiple-system-atrophy-from-idiopathic-parkinson-s-disease-a-susceptibility-weighted-imaging-study
#19
Na Wang, HuaGuang Yang, ChengBo Li, GuoGuang Fan, XiaoGuang Luo
OBJECTIVE: To investigate the value of 'swallow-tail' sign and putaminal hypointensity on 3 T susceptibility-weighted imaging (SWI) for distinguishing multiple system atrophy (MSA) from idiopathic Parkinson's disease (IPD). METHODS: Three groups - 39 MSA patients, 18 IPD patients,and 31 healthy controls (HCs) - were administered a 3 T SWI sequence to evaluate 'swallow-tail' sign and putaminal hypointensity using visual scales from 0 to 2 and 0 to 3 scores, respectively...
January 19, 2017: European Radiology
https://www.readbyqxmd.com/read/28096729/advanced-mri-for-pediatric-brain-tumors-with-emphasis-on-clinical-benefits
#20
REVIEW
Hyun Woo Goo, Young-Shin Ra
Conventional anatomic brain MRI is often limited in evaluating pediatric brain tumors, the most common solid tumors and a leading cause of death in children. Advanced brain MRI techniques have great potential to improve diagnostic performance in children with brain tumors and overcome diagnostic pitfalls resulting from diverse tumor pathologies as well as nonspecific or overlapped imaging findings. Advanced MRI techniques used for evaluating pediatric brain tumors include diffusion-weighted imaging, diffusion tensor imaging, functional MRI, perfusion imaging, spectroscopy, susceptibility-weighted imaging, and chemical exchange saturation transfer imaging...
January 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
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