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https://www.readbyqxmd.com/read/29051996/diffusion-weighted-mri-stroke-volume-following-recanalization-treatment-is-threshold-dependent
#1
Rani Gupta Sah, Christopher D d'Esterre, Michael D Hill, Moiz Hafeez, Sana Tariq, Nils D Forkert, Andrew M Demchuk, Mayank Goyal, Philip A Barber
PURPOSE: Infarct lesion segmentation has been problematic as there are a wide range of relative and absolute diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) thresholds that have been used for this purpose. We examined differences of stroke lesion volume and evolution evaluated by magnetic resonance imaging (MRI) during the immediate post-treatment phase (<5 h) and at 24 h. METHODS: In this study 33 acute ischemic stroke patients were imaged with MRI <5 h and 24 h post-reperfusion treatment...
October 19, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29050345/differential-diagnosis-of-hemangiomas-from-spinal-osteolytic-metastases-using-3-0-t-mri-comparison-of-t1-weighted-imaging-chemical-shift-imaging-diffusion-weighted-and-contrast-enhanced-imaging
#2
Yan-Jie Shi, Xiao-Ting Li, Xiao-Yan Zhang, Yu-Liang Liu, Lei Tang, Ying-Shi Sun
The retrospective study investigated accuracy of quantitative evaluation of T1-weighted imaging (T1WI) with and without fat suppression (FS), chemical-shift, diffusion-weighted imaging (DWI) and enhanced imaging at 3.0 T MRI for distinguishing spinal hemangiomas from metastases. 27 patients with 33 spinal hemangiomas (15 atypical hemangiomas) and 26 patients with 71 metastases were recruited. T1WI, FS T1WI, in- and out-phase, DWI and enhanced T1WI were acquired. Signal intensities (SIs) of lesions were obtained...
September 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29050160/-value-of-mdixon-quant-sequence-diffusion-weighted-imaging-in-quantitatively-diagnosing-the-sacroiliitis-stages
#3
Y Y An, H X Li, Y Zhan, X W Lei
Objective: To evaluate the value of mDIXON-Quant sequence, diffusion-weighted imaging (DWI) in quantitative diagnosing of the sacroiliitis stages in patients with ankylosing spondylitis (AS). Methods: Based on the Bath Ankylosing Spondylitis Activity Index (BASDAI) and laboratory parameters, a total of 51 patients were diagnosed with AS. They were divided into two groups as early active group (n=20) and chronic active group (n=31), and at the same time, 25 healthy people from Tianjin were included as control group...
October 10, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29050159/-value-of-diffusion-weighted-imaging-in-differentiating-sellar-malignant-germ-cell-tumors-from-raniopharyngioma
#4
Y F Guo, J L Cheng, Y Zhang, C Y Zhang, W J Wang
Objective: To investigate the diagnostic value of diffusion-weighted imaging (DWI) and apparent diffusion coefficient(ADC) values in the differentiation of sellar malignant germ cell tumors and raniopharyngioma. Methods: This retrospective study included 36 patients(14 cases of malignant germ cell tumor and 22 patients with raniopharyngioma) with histopathologically-confirmed sellar tumors from January 2013 to April 2017 in the First Affiliated Hospital of Zhengzhou University.All patients underwent conventional MRI and DWI before the treatment...
October 10, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29045185/apparent-diffusion-coefficient-values-of-prostate-cancer-comparison-of-2d-and-3d-rois
#5
Tsutomu Tamada, Chenchan Huang, Justin M Ream, Myles Taffel, Samir S Taneja, Andrew B Rosenkrantz
OBJECTIVE: The purpose of this study was to compare the reproducibility and diagnostic performance of 2D and 3D ROIs for prostate apparent diffusion coefficient (ADC) measurements. MATERIALS AND METHODS: The study included 56 patients with prostate cancer undergoing 3-T MRI including DWI (b = 50 and 1000 s/mm(2)) before radical prostatectomy. Histologic findings from prostatectomy specimens were reviewed to denote each patient's dominant tumor and a benign region with visually decreased ADC...
October 18, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29044908/tumor-radiomic-heterogeneity-multiparametric-functional-imaging-to-characterize-variability-and-predict-response-following-cervical-cancer-radiation-therapy
#6
Stephen R Bowen, William T C Yuh, Daniel S Hippe, Wei Wu, Savannah C Partridge, Saba Elias, Guang Jia, Zhibin Huang, George A Sandison, Dennis Nelson, Michael V Knopp, Simon S Lo, Paul E Kinahan, Nina A Mayr
BACKGROUND: Robust approaches to quantify tumor heterogeneity are needed to provide early decision support for precise individualized therapy. PURPOSE: To conduct a technical exploration of longitudinal changes in tumor heterogeneity patterns on dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI), diffusion-weighted imaging (DWI) and FDG positron emission tomography / computed tomography (PET/CT), and their association to radiation therapy (RT) response in cervical cancer...
October 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29044896/support-vector-machine-for-breast-cancer-classification-using-diffusion-weighted-mri-histogram-features-preliminary-study
#7
Igor Vidić, Liv Egnell, Neil P Jerome, Jose R Teruel, Torill E Sjøbakk, Agnes Østlie, Hans E Fjøsne, Tone F Bathen, Pål Erik Goa
BACKGROUND: Diffusion-weighted MRI (DWI) is currently one of the fastest developing MRI-based techniques in oncology. Histogram properties from model fitting of DWI are useful features for differentiation of lesions, and classification can potentially be improved by machine learning. PURPOSE: To evaluate classification of malignant and benign tumors and breast cancer subtypes using support vector machine (SVM). STUDY TYPE: Prospective. SUBJECTS: Fifty-one patients with benign (n = 23) and malignant (n = 28) breast tumors (26 ER+, whereof six were HER2+)...
October 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29038934/characterisation-of-fibrosis-in-chemically-induced-rat-mammary-carcinomas-using-multi-modal-endogenous-contrast-mri-on-a-1-5t-clinical-platform
#8
Neil P Jerome, Jessica K R Boult, Matthew R Orton, James A d'Arcy, Ashutosh Nerurkar, Martin O Leach, Dow-Mu Koh, David J Collins, Simon P Robinson
OBJECTIVES: To determine the ability of multi-parametric, endogenous contrast MRI to detect and quantify fibrosis in a chemically-induced rat model of mammary carcinoma. METHODS: Female Sprague-Dawley rats (n=18) were administered with N-methyl-N-nitrosourea; resulting mammary carcinomas underwent nine-b-value diffusion-weighted (DWI), ultrashort-echo (UTE) and magnetisation transfer (MT) magnetic resonance imaging (MRI) on a clinical 1.5T platform, and associated quantitative MR parameters were calculated...
October 16, 2017: European Radiology
https://www.readbyqxmd.com/read/29034496/clinical-impact-of-the-microembolic-signal-burden-during-catheter-ablation-for-atrial-fibrillation-just-a-lot-of-noise
#9
Christian von Bary, Thomas Deneke, Thomas Arentz, Anja Schade, Heiko Lehrmann, Susanne Schwab-Malek, Sabine Fredersdorf, Dobri Baldaranov, Lars Maier, Felix Schlachetzki
OBJECTIVES: Microembolic signal detection by transcranial Doppler ultrasonography may be considered a surrogate for cerebral events during invasive cardiac procedures. However, the impact of the microembolic signal count during pulmonary vein isolation on the clinical outcome is not well evaluated. We investigated the effect of the microembolic signal count on the occurrence of new silent cerebral embolism measured by diffusion-weighted imaging (DWI)-magnetic resonance imaging (MRI), changes in neuropsychological testing, and the occurrence of clinical events during long-term follow-up after pulmonary vein isolation...
October 16, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29034282/differentiation-of-prostate-cancer-lesions-in-the-transition-zone-by-diffusion-weighted-mri
#10
Jie Bao, Ximing Wang, Chunhong Hu, Jianquan Hou, Fenglin Dong, Lingchuan Guo
OBJECTIVE: To differentiate prostate cancer lesions in transition zone by diffusion-weighted-MRI (DW-MRI). METHODS: Data from a total of 63 patients who underwent preoperative DWI (b of 0-1000 s/mm(2)) were prospectively collected and processed by a monoexponential (DWI) model and compared with a biexponential (IVIM) model for quantitation of apparent diffusion coefficients (ADCs), perfusion fraction f, diffusivity D and pseudo-diffusivity D*. Histogram analyses were performed by outlining entire-tumor regions of interest (ROIs)...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/29031584/validation-of-diffusion-measurements-obtained-on-a-0-35t-mr-in-malawi-important-insights-for-radiologists-in-low-income-settings-with-low-field-mri
#11
Yuchuan Zhuang, Michael J Potchen, Samuel D Kampondeni, Madalina Tivarus, Gretchen L Birbeck, Jianhui Zhong
PURPOSE: To investigate the reliability of diffusion weighted image (DWI) measurements obtained on a 0.35T MR scanner in Malawi for malaria research. MATERIALS AND METHODS: The same healthy volunteers (n=6) were scanned on a 0.35T MR scanner in Malawi and a 3T scanner in the US. Three subjects had two repeated DWI scans at 0.35T. Due to scanner constraints, only three diffusion gradient directions for DWI on 0.35T could be obtained. An apparent diffusion coefficient (ADC) map was reconstructed from the 0...
October 12, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29031583/model-selection-for-high-b-value-diffusion-weighted-mri-of-the-prostate
#12
Yousef Mazaheri, Andreas M Hötker, Amita Shukla-Dave, Oguz Akin, Hedvig Hricak
PURPOSE: To assess the abilities of the standard mono-exponential (ME), bi-exponential (BE), diffusion kurtosis (DK) and stretched exponential (SE) models to characterize diffusion signal in malignant and prostatic tissues and determine which of the four models best characterizes these tissues on a per-voxel basis. MATERIALS AND METHODS: This institutional-review-board-approved, HIPAA-compliant, retrospective study included 55 patients (median age, 61years; range, 42-77years) with untreated, biopsy-proven PCa who underwent endorectal coil MRI at 3-Tesla, diffusion-weighted MRI acquired at eight b-values from 0 to 2000s/mm(2)...
October 11, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29029532/11c-choline-pet-ct-and-whole-body-mri-including-diffusion-weighted-imaging-for-patients-with-recurrent-prostate-cancer
#13
Hinrich Wieder, Ambros J Beer, Konstantin Holzapfel, Martin Henninger, Tobias Maurer, Sarah Schwarzenboeck, Ernst J Rummeny, Matthias Eiber, Jens Stollfuss
PURPOSE: To compare the detection efficacy of 11C-choline positron emission tomography and computed tomography (PET/CT) with whole-body magnetic resonance imaging (MRI) including diffusion-weighted imaging (DWI) in patients with suspected recurrent prostate cancer. MATERIALS AND METHODS: Fifty-seven patients (mean age 68, range 54-80 years) underwent 11C-choline PET/CT and MRI using T1-weighted (T1w), short-tau inversion recovery (STIR), and DWI. Two readers visually rated suspicious lesions on a 5-point scale in 20 different regions...
September 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/29026583/a-case-of-hypersomnia-due-to-bilateral-thalamic-stroke
#14
Mohammed Osman, Ahmed Abdalla, Mohammed Al-Qasmi, Ghassan Bachuwa
Bilateral thalamic infarction (BTI) can present as sleep-like coma without focal neurological signs which can lead to delay in the diagnosis. Due to the diagnostic challenge, treatment is often delayed. The early use of DWI-MRI in suspected cases can help in the early diagnosis and treatment.
October 2017: Clinical Case Reports
https://www.readbyqxmd.com/read/29025422/readout-segmented-multi-shot-diffusion-weighted-mri-of-the-knee-joint-in-patients-with-juvenile-idiopathic-arthritis
#15
Alexander Sauer, Mengxia Li, Annette Holl-Wieden, Thomas Pabst, Henning Neubauer
BACKGROUND: Diffusion-weighted MRI has been proposed as a new technique for imaging synovitis without intravenous contrast application. We investigated diagnostic utility of multi-shot readout-segmented diffusion-weighted MRI (multi-shot DWI) for synovial imaging of the knee joint in patients with juvenile idiopathic arthritis (JIA). METHODS: Thirty-two consecutive patients with confirmed or suspected JIA (21 girls, median age 13 years) underwent routine 1.5 T MRI with contrast-enhanced T1w imaging (contrast-enhanced MRI) and with multi-shot DWI (RESOLVE, b-values 0-50 and 800 s/mm(2))...
October 12, 2017: Pediatric Rheumatology Online Journal
https://www.readbyqxmd.com/read/29023986/evaluation-of-short-and-long-term-efficacy-of-chemoradiotherapy-for-advanced-cervical-cancer-using-hsp70-protein-combined-with-multimodal-mri
#16
Yun-Xiang Qi, Kun Liu, Jun Yin, Lu Li
This study aims to evaluate the efficacy of chemoradiotherapy for advanced cervical cancer using heat shock protein 70 (HSP70) combined with multimodal MRI. The protein expressions of HSP70 in biopsy specimens obtained from 101 patients with cervical cancer were detected by immunohistochemistry. Plain MRI scan, DWI, DCE-MR and MRS were performed before and after a period of six months of chemoradiotherapy. All patients were assigned into the complete response (CR) and partial response (PR) groups. HSP70 protein expression, tumor diameter and tumor volume were lower in the CR group than in the PR group...
October 11, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29023154/diagnostic-performance-of-dwi-for-differentiating-high-from-low-grade-clear-cell-renal-cell-carcinoma-a-systematic-review-and-meta-analysis
#17
Sungmin Woo, Chong Hyun Suh, Sang Youn Kim, Jeong Yeon Cho, Seung Hyup Kim
OBJECTIVE: The purpose of our study was to review the diagnostic performance of DWI for differentiating high- from low-grade clear cell renal cell carcinoma (RCC). MATERIALS AND METHODS: MEDLINE, EMBASE, and Cochrane library databases were searched up to March 15, 2017. We included diagnostic accuracy studies that used DWI for differentiating high- from low-grade clear cell RCC compared with histopathologic results of Fuhrman grade based on nephrectomy or biopsy specimens in original research articles...
October 12, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29023142/diffusion-weighted-imaging-in-ectopic-pregnancy-ring-of-restriction-sign
#18
Afak Durur Karakaya, Mehmet Seker, İrmak Durur-Subaşı
OBJECTIVE: To demonstrate the diffusion weighted imaging (DWI) findings of ectopic pregnancy (EP) and introduce the "ring of restriction" sign by discussing possible causes. METHODS: Between January 2014 and January 2017, patients with EP and examined by magnetic resonance imaging (MRI) on a 3-T scanner were retrospectively evaluated. MRI and DWI findings were recorded. RESULTS: A total of 40 patients were diagnosed with EP at our university hospital, eight of whom (20%) were evaluated by MRI and DWI...
October 12, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29018942/evaluation-of-an-abbreviated-screening-mri-protocol-for-patients-at-risk-for-hepatocellular-carcinoma
#19
Jennifer Y Lee, Eugene J Huo, Stefanie Weinstein, Charmaine Santos, Alexander Monto, Carlos U Corvera, Judy Yee, Thomas A Hope
PURPOSE: In this study, we compare an abbreviated screening MRI protocol (aMRI), utilizing only dynamic contrast-enhanced images, to a conventional liver MRI (cMRI) for the characterization of observations in at-risk patients. MATERIALS AND METHODS: 164 consecutive HCC screening MRIs were retrospectively analyzed. Two sets of de-identified image sets were created: one with all acquired sequences including T2- and diffusion-weighted sequences (cMRI), and one with only T1-weighted precontrast and dynamic post-contrast images utilizing an extracellular gadolinium contrast agent (aMRI)...
October 10, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/29018499/differentiating-benign-from-malignant-sinonasal-lesions-feasibility-of-diffusion-weighted-mri
#20
Khaled M El-Gerby, Mohammad Waheed El-Anwar
Introduction  Appearance of nasal masses on routine CT and MRI are not pathognomonic. We utilized the apparent diffusion coefficient (ADC) value obtained from diffusion weighted image (DWI) to detect the differences in the microstructures of tumor and non-tumor tissues. Objective  The objective of our study was to evaluate the diagnostic role of DWI and ADC values in differentiating between malignant and benign sinonasal lesions and its correlation with histopathological results as the reference standard...
October 2017: International Archives of Otorhinolaryngology
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