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Journal of Magnetic Resonance Imaging: JMRI

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https://www.readbyqxmd.com/read/28940951/instrument-visualization-using-conventional-and-compressed-sensing-semac-for-interventional-mri-at-3t
#1
Lena Sonnow, Wesley D Gilson, Esther Raithel, Mathias Nittka, Frank Wacker, Jan Fritz
BACKGROUND: Interventional magnetic resonance imaging (MRI) at 3T benefits from higher spatial and temporal resolution, but artifacts of metallic instruments are often larger and may obscure target structures. PURPOSE: To test that compressed sensing (CS) slice-encoding metal artifact correction (SEMAC) is feasible for 3T interventional MRI and affords more accurate instrument visualization than turbo spin echo (TSE) and gradient echo (GRE) techniques, and facilitates faster data acquisition than conventional SEMAC...
September 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28940646/chronic-kidney-disease-pathological-and-functional-evaluation-with-intravoxel-incoherent-motion-diffusion-weighted-imaging
#2
Wei Mao, Jianjun Zhou, Mengsu Zeng, Yuqin Ding, Lijie Qu, Caizhong Chen, Xiaoqiang Ding, Yaqiong Wang, Caixia Fu
BACKGROUND: Because chronic kidney disease (CKD) is a worldwide problem, accurate pathological and functional evaluation is required for planning treatment and follow-up. Intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) can assess both capillary perfusion and tissue diffusion and may be helpful in evaluating renal function and pathology. PURPOSE: To evaluate functional and pathological alterations in CKD by applying IVIM-DWI. STUDY TYPE: Prospective study...
September 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28926163/radiomics-signature-a-potential-biomarker-for-the-prediction-of-mgmt-promoter-methylation-in-glioblastoma
#3
Yi-Bin Xi, Fan Guo, Zi-Liang Xu, Chen Li, Wei Wei, Ping Tian, Ting-Ting Liu, Lin Liu, Gang Chen, Jing Ye, Guang Cheng, Long-Biao Cui, Hong-Juan Zhang, Wei Qin, Hong Yin
BACKGROUND: In glioblastoma (GBM), promoter methylation of the DNA repair gene O-methylguanine-DNA methyltransferase (MGMT) is associated with beneficial chemotherapy. PURPOSE/HYPOTHESIS: To analyze radiomics features for utilizing the full potential of medical imaging as biomarkers of MGMT promoter methylation. STUDY TYPE: Retrospective. POPULATION/SUBJECTS: In all, 98 GBM patients with known MGMT (48 methylated and 50 unmethylated tumors)...
September 19, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28925047/voxel-by-voxel-4d-flow-mri-based-assessment-of-regional-reverse-flow-in-the-aorta
#4
Xin Shen, Susanne Schnell, Alex J Barker, Kenichiro Suwa, Lingzi Tashakkor, Kelly Jarvis, James C Carr, Jeremy D Collins, Shyam Prabhakaran, Michael Markl
BACKGROUND: Complex and reverse flow in the aorta has been implicated in aneurysm development and stroke via retrograde embolization. PURPOSE: To evaluate global and regional differences between standard 2D plane-based and volumetric voxel-based quantification of regional forward/reverse flow, and reverse flow fraction (RFF) in the aorta. STUDY TYPE: Retrospective. SUBJECTS: In all, 35 subjects: 10 healthy controls (age: 57 ± 7 years, nine male), nine patients without aortic valve regurgitation (AR) (age: 63 ± 10 years, seven male), six patients with mild AR (age: 66 ± 6 years, five male), and 10 with moderate or severe AR (age: 60 ± 16 years, eight male)...
September 18, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28922524/dynamic-contrast-enhanced-mri-in-orbital-lymphoproliferative-disorders-effects-of-region-of-interest-selection-methods-on-time-efficiency-measurement-reproducibility-and-diagnostic-ability
#5
Wen Qian, Xiao-Quan Xu, Hao Hu, Guo-Yi Su, Jiang-Fen Wu, Hai-Bin Shi, Fei-Yun Wu
BACKGROUND: Previous studies indicated that dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) could serve as a useful biomarker for differentiating malignant from benign orbital lymphoproliferative disorders (OLPDs). PURPOSE: To investigate the influence of different region of interest (ROI) selection methods on the measurements of DCE-MRI parameters, and their diagnostic ability in discriminating malignant from benign OLPDs. STUDY TYPE: Retrospective study...
September 18, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28906567/self-calibrating-wave-encoded-variable-density-single-shot-fast-spin-echo-imaging
#6
Feiyu Chen, Valentina Taviani, Jonathan I Tamir, Joseph Y Cheng, Tao Zhang, Qiong Song, Brian A Hargreaves, John M Pauly, Shreyas S Vasanawala
BACKGROUND: It is highly desirable in clinical abdominal MR scans to accelerate single-shot fast spin echo (SSFSE) imaging and reduce blurring due to T2 decay and partial-Fourier acquisition. PURPOSE: To develop and investigate the clinical feasibility of wave-encoded variable-density SSFSE imaging for improved image quality and scan time reduction. STUDY TYPE: Prospective controlled clinical trial. SUBJECTS: With Institutional Review Board approval and informed consent, the proposed method was assessed on 20 consecutive adult patients (10 male, 10 female, range, 24-84 years)...
September 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28901685/diagnostic-performance-of-ct-gadoxetate-disodium-enhanced-mri-and-pet-ct-for-the-diagnosis-of-colorectal-liver-metastasis-systematic-review-and-meta-analysis
#7
Sang Hyun Choi, So Yeon Kim, Seong Ho Park, Kyung Won Kim, Ja Youn Lee, Seung Soo Lee, Moon-Gyu Lee
BACKGROUND: Imaging studies, including computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography (PET), have an essential role in the detection and localization of colorectal liver metastasis (CRLM). PURPOSE: To systematically determine the diagnostic accuracy of multidetector row CT (MDCT), gadoxetate disodium-enhanced MRI, and PET/CT for diagnosing CRLM and the sources of heterogeneity between the reported results. STUDY TYPE: Systematic review and meta-analysis...
September 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28901655/clinically-insignificant-prostate-cancer-suitable-for-active-surveillance-according-to-prostate-cancer-research-international-active-surveillance-criteria-utility-of-pi-rads-v2
#8
Jae Hyun Yim, Chan Kyo Kim, Jae-Hun Kim
BACKGROUND: Active surveillance (AS) is an important treatment strategy for prostate cancer (PCa). Prostate Imaging-Reporting and Data System (PI-RADS) v2 has been addressed, but few studies have reported the value of PI-RADS v2 for assessing risk stratification in patients with PCa, especially on selecting potential candidates for AS. PURPOSE: To investigate the utility of PI-RADS v2 and apparent diffusion coefficient (ADC) in evaluating patients with insignificant PCa, who are suitable for AS...
September 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28901638/adc-derived-spatial-features-can-accurately-classify-adnexal-lesions
#9
Anahita Fathi Kazerooni, Mahnaz Nabil, Hamidreza Haghighat Khah, Mohammadreza Alviri, Maryam Heidari-Sooreshjaani, Masoumeh Gity, Mahrooz Malek, Hamidreza Saligheh Rad
BACKGROUND: The role of quantitative apparent diffusion coefficient (ADC) maps in differentiating adnexal masses is unresolved. PURPOSE/HYPOTHESIS: To propose an objective diagnostic method devised based on spatial features for predicting benignity/malignancy of adnexal masses in ADC maps. STUDY TYPE: Prospective. POPULATION: In all, 70 women with sonographically indeterminate and histopathologically confirmed adnexal masses (38 benign, 3 borderline, and 29 malignant) were considered for this study...
September 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28901594/quantitative-evaluation-of-breast-cancer-response-to-neoadjuvant-chemotherapy-by-diffusion-tensor-imaging-initial-results
#10
Edna Furman-Haran, Noam Nissan, Verónica Ricart-Selma, Carmen Martinez-Rubio, Hadassa Degani, Julia Camps-Herrero
BACKGROUND: Diffusion tensor imaging (DTI) yields several parameters that have not been tested in response evaluation to neoadjuvant chemotherapy (NAC). PURPOSE: To evaluate and compare in reference to histopathology findings the ability of DTI and dynamic contrast-enhanced (DCE) MRI to monitor response to NAC. STUDY TYPE: Retrospective. POPULATION: Twenty patients treated with neoadjuvant chemotherapy. FIELD STRENGTH/SEQUENCE: 1...
September 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28884957/long-term-sequelae-of-hippocampal-lesions-in-patients-with-transient-global-amnesia-a-multiparametric-mri-study
#11
Xiaochuan Wang, Ran Zhang, Wenping Wei, Haibo Jiang, Zhongming Gao, Jianzhong Lin, Jiaxing Zhang
BACKGROUND: MRI signal diffusion-weighted imaging (DWI) hyperintensity in the hippocampus in patients with transient global amnesia (TGA) are resolved within several days after the onset of TGA. PURPOSE: To use multiparametric MRI to unravel the sequelae of TGA. STUDY TYPE: A prospective longitudinal study. POPULATION: Eight TGA patients. FIELD STRENGTH/SEQUENCE: A 3.0T Siemens Tim Trio MRI scanner with T1 -weighted MPRAGE, diffusion-weighted echo planar imaging, and multiecho gradient-recalled echo sequences...
September 7, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28872226/prebiopsy-multiparametric-mri-based-risk-score-for-predicting-prostate-cancer-in-biopsy-naive-men-with-prostate-specific-antigen-between-4-10%C3%A2-ng-ml
#12
Durgesh Kumar Dwivedi, Rajeev Kumar, Alok Kumar Dwivedi, Girdhar S Bora, Sanjay Thulkar, Sanjay Sharma, Siddhartha Datta Gupta, Naranamangalam R Jagannathan
BACKGROUND: Risk calculators have traditionally utilized serum prostate-specific antigen (PSA) values in addition to clinical variables to predict the likelihood of prostate cancer (PCa). PURPOSE: To develop a prebiopsy multiparametric MRI (mpMRI)-based risk score (RS) and a statistical equation for predicting the risk of PCa in biopsy-naive men with serum PSA between 4-10 ng/mL that may help reduce unnecessary biopsies. STUDY TYPE: Prospective cross-sectional study...
September 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28861934/indirect-mri-of-17-o-labeled-water-using-steady-state-sequences-signal-simulation-and-preclinical-experiment
#13
Kohsuke Kudo, Taisuke Harada, Hiroyuki Kameda, Ikuko Uwano, Fumio Yamashita, Satomi Higuchi, Kunihiro Yoshioka, Makoto Sasaki
BACKGROUND: Few studies have been reported for T2 -weighted indirect (17) O imaging. PURPOSE/HYPOTHESIS: To evaluate the feasibility of steady-state sequences for indirect (17) O brain imaging. STUDY TYPE: Signal simulation, phantom measurements, and prospective animal experiments were performed in accordance with the institutional guidelines for animal experiments. POPULATION/SUBJECTS/PHANTOM/SPECIMEN/ANIMAL MODEL: Signal simulations of balanced steady-state free precession (bSSFP) were performed for concentrations of (17) O ranging from 0...
August 31, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28861929/myelin-content-changes-in-probable-alzheimer-s-disease-and-mild-cognitive-impairment-associations-with-age-and-severity-of-neuropsychiatric-impairment
#14
Eleftherios Kavroulakis, Panagiotis G Simos, Georgios Kalaitzakis, Thomas G Maris, Dimitra Karageorgou, Ioannis Zaganas, Simeon Panagiotakis, Maria Basta, Alexandros Vgontzas, Efrosini Papadaki
BACKGROUND: Existing indices of white matter integrity such as fractional anisotropy and magnetization transfer ratio may not provide optimal specificity to myelin content. In contrast, myelin water fraction (MWF) derived from the multiecho T2 relaxation time technique may serve as a more direct measure of myelin content. PURPOSE/HYPOTHESIS: The goal of the present study was to identify markers of regional demyelination in patients with probable Alzheimer's disease (AD) and mild cognitive impairment (MCI) in relation to age and severity of neuropsychiatric impairment...
August 31, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28851124/mri-proton-density-fat-fraction-is-robust-across-the-biologically-plausible-range-of-triglyceride-spectra-in-adults-with-nonalcoholic-steatohepatitis
#15
Cheng William Hong, Adrija Mamidipalli, Jonathan C Hooker, Gavin Hamilton, Tanya Wolfson, Dennis H Chen, Soudabeh Fazeli Dehkordy, Michael S Middleton, Scott B Reeder, Rohit Loomba, Claude B Sirlin
BACKGROUND: Proton density fat fraction (PDFF) estimation requires spectral modeling of the hepatic triglyceride (TG) signal. Deviations in the TG spectrum may occur, leading to bias in PDFF quantification. PURPOSE: To investigate the effects of varying six-peak TG spectral models on PDFF estimation bias. STUDY TYPE: Retrospective secondary analysis of prospectively acquired clinical research data. POPULATION: Forty-four adults with biopsy-confirmed nonalcoholic steatohepatitis...
August 29, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28845594/textural-features-of-dynamic-contrast-enhanced-mri-derived-model-free-and-model-based-parameter-maps-in-glioma-grading
#16
Tian Xie, Xiao Chen, Jingqin Fang, Houyi Kang, Wei Xue, Haipeng Tong, Peng Cao, Sumei Wang, Yizeng Yang, Weiguo Zhang
BACKGROUND: Presurgical glioma grading by dynamic contrast-enhanced MRI (DCE-MRI) has unresolved issues. PURPOSE: The aim of this study was to investigate the ability of textural features derived from pharmacokinetic model-based or model-free parameter maps of DCE-MRI in discriminating between different grades of gliomas, and their correlation with pathological index. STUDY TYPE: Retrospective. SUBJECTS: Forty-two adults with brain gliomas...
August 28, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28842937/optimization-of-region-of-interest-sampling-strategies-for-hepatic-mri-proton-density-fat-fraction-quantification
#17
Cheng William Hong, Tanya Wolfson, Ethan Z Sy, Alexandra N Schlein, Jonathan C Hooker, Soudabeh Fazeli Dehkordy, Gavin Hamilton, Scott B Reeder, Rohit Loomba, Claude B Sirlin
BACKGROUND: Clinical trials utilizing proton density fat fraction (PDFF) as an imaging biomarker for hepatic steatosis have used a laborious region-of-interest (ROI) sampling strategy of placing an ROI in each hepatic segment. PURPOSE: To identify a strategy with the fewest ROIs that consistently achieves close agreement with the nine-ROI strategy. STUDY TYPE: Retrospective secondary analysis of prospectively acquired clinical research data...
August 26, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28842935/quantification-of-the-salivary-volume-flow-rate-in-the-parotid-duct-using-the-time-spatial-labeling-inversion-pulse-time-slip-technique-at-mri-a-feasibility-study
#18
Wataru Fukumoto, Toru Higaki, Yoshiko Matsuoka, Fuminari Tatsugami, Yasutaka Baba, Makoto Iida, Kazuo Awai
BACKGROUND: We developed a method to quantify the volume flow rate (VFR) using the time-spatial labeling inversion pulse (Time-SLIP) technique to evaluate salivary function. PURPOSE/HYPOTHESIS: To investigate the accuracy of quantification of the salivary VFR using the Time-SLIP technique in phantoms and to examine the feasibility of its use in human subjects. STUDY TYPE: This was a prospective phantom and volunteer study. POPULATION/SUBJECTS/PHANTOM/SPECIMEN/ANIMAL MODEL: A phantom and 23 normal volunteers who fasted at least 2 hours study was performed...
August 26, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28836310/deep-neural-network-based-computer-assisted-detection-of-cerebral-aneurysms-in-mr-angiography
#19
Takahiro Nakao, Shouhei Hanaoka, Yukihiro Nomura, Issei Sato, Mitsutaka Nemoto, Soichiro Miki, Eriko Maeda, Takeharu Yoshikawa, Naoto Hayashi, Osamu Abe
BACKGROUND: The usefulness of computer-assisted detection (CAD) for detecting cerebral aneurysms has been reported; therefore, the improved performance of CAD will help to detect cerebral aneurysms. PURPOSE: To develop a CAD system for intracranial aneurysms on unenhanced magnetic resonance angiography (MRA) images based on a deep convolutional neural network (CNN) and a maximum intensity projection (MIP) algorithm, and to demonstrate the usefulness of the system by training and evaluating it using a large dataset...
August 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28833914/patellofemoral-and-tibiofemoral-alignment-in-a-fully-weight-bearing-upright-mr-implementation-and-repeatability
#20
Erin M Macri, Kay M Crossley, Agnes G d'Entremont, Harvi F Hart, Bruce B Forster, David R Wilson, Charles R Ratzlaff, Anne M Walsh, Karim M Khan
PURPOSE: To develop methods for evaluating 3D patellofemoral and tibiofemoral alignment in vertical open-bore magnetic resonance (MR) scanners, with participants upright and fully weight-bearing; and to evaluate the repeatability of these methods in individuals with patellofemoral osteoarthritis (OA) and in asymptomatic knees. MATERIALS AND METHODS: Our methods extend previously validated, reliable methods for evaluating alignment into an upright MR environment...
August 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
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