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Segmented MRI

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https://www.readbyqxmd.com/read/29166129/initial-observations-of-intra-and-inter-fractional-motion-variation-in-mr-guided-lung-sbrt
#1
David H Thomas, Anand Santhanam, Amar U Kishan, Minsong Cao, James Lamb, Yugang Min, Dylan O'Connell, Yingli Yang, Nzhde Agazaryan, Percy Lee, Daniel Low
OBJECTIVE: To evaluate variations in intra- and inter-fractional tumor motion, and the effect on ITV contour accuracy, using deformable image registration of real-time 2D-sagital cine-mode MRI acquired during lung SBRT treatments. METHODS: Five lung tumor patients underwent free breathing SBRT treatments on the ViewRay system, with dose prescribed to a planning target volume (PTV; defined as a 3-6 mm expansion of the 4DCT-ITV). Sagittal slice cine-MR images (3.5x3...
November 22, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29164584/cardiac-magnetic-resonance-in-systemic-sclerosis-patients-with-cardiac-symptoms
#2
A Meduri, D V Di Molfetta, L Natale, R Manfredi
OBJECTIVE: Systemic sclerosis (SSc) is characterized by widespread vascular lesions and skin and internal organs fibrosis, including the heart; all cardiac layers, endocardium, myocardium, and pericardium, may be involved. We report the relevance of cardiac MRI findings in scleroderma patients with cardiac symptoms. PATIENTS AND METHODS: 50 patients, all fulfilling the ACR SSc criteria (19 with limited and 31 with diffused skin involvement) were evaluated using a 1...
November 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29159960/mapping-the-structural-and-functional-network-architecture-of-the-medial-temporal-lobe-using-7t-mri
#3
Preya Shah, Danielle S Bassett, Laura E M Wisse, John A Detre, Joel M Stein, Paul A Yushkevich, Russell T Shinohara, John B Pluta, Elijah Valenciano, Molly Daffner, David A Wolk, Mark A Elliott, Brian Litt, Kathryn A Davis, Sandhitsu R Das
Medial temporal lobe (MTL) subregions play integral roles in memory function and are differentially affected in various neurological and psychiatric disorders. The ability to structurally and functionally characterize these subregions may be important to understanding MTL physiology and diagnosing diseases involving the MTL. In this study, we characterized network architecture of the MTL in healthy subjects (n = 31) using both resting state functional MRI and MTL-focused T2-weighted structural MRI at 7 tesla...
November 20, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29159937/diffusion-weighted-mri-and-intravoxel-incoherent-motion-model-for-diagnosis-of-pediatric-solid-abdominal-tumors
#4
Emma M Meeus, Niloufar Zarinabad, Karen A Manias, Jan Novak, Heather E L Rose, Hamid Dehghani, Katharine Foster, Bruce Morland, Andrew C Peet
BACKGROUND: Pediatric retroperitoneal tumors in the renal bed are often large and heterogeneous, and their diagnosis based on conventional imaging alone is not possible. More advanced imaging methods, such as diffusion-weighted (DW) MRI and the use of intravoxel incoherent motion (IVIM), have the potential to provide additional biomarkers that could facilitate their noninvasive diagnosis. PURPOSE: To assess the use of an IVIM model for diagnosis of childhood malignant abdominal tumors and discrimination of benign from malignant lesions...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29159467/the-use-of-multiparametric-quantitative-magnetic-resonance-imaging-for-evaluating-visually-assigned-lesion-groups-in-patients-with-multiple-sclerosis
#5
Christian Thaler, Tobias D Faizy, Jan Sedlacik, Maxim Bester, Jan-Patrick Stellmann, Christoph Heesen, Jens Fiehler, Susanne Siemonsen
In multiple sclerosis (MS), inflammatory lesions present a broad spectrum of histopathologic processes. For a better discrimination, lesions are visually defined into different lesion groups according to their appearance on conventional magnetic resonance imaging (MRI). The aim of this study was to investigate the properties of different MS lesion groups using multiparametric quantitative MRI. 35 patients diagnosed with relapsing-remitting MS received 3 Tesla MRI including magnetization-prepared 2 rapid acquisition gradient echo, diffusion tensor imaging and magnetization transfer imaging...
November 20, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/29159042/evaluation-of-a-deep-learning-approach-for-the-segmentation-of-brain-tissues-and-white-matter-hyperintensities-of-presumed-vascular-origin-in%C3%A2-mri
#6
Pim Moeskops, Jeroen de Bresser, Hugo J Kuijf, Adriënne M Mendrik, Geert Jan Biessels, Josien P W Pluim, Ivana Išgum
Automatic segmentation of brain tissues and white matter hyperintensities of presumed vascular origin (WMH) in MRI of older patients is widely described in the literature. Although brain abnormalities and motion artefacts are common in this age group, most segmentation methods are not evaluated in a setting that includes these items. In the present study, our tissue segmentation method for brain MRI was extended and evaluated for additional WMH segmentation. Furthermore, our method was evaluated in two large cohorts with a realistic variation in brain abnormalities and motion artefacts...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29158516/prostate-shapes-on-pre-treatment-mri-between-prostate-cancer-patients-who-do-and-do-not-undergo-biochemical-recurrence-are-different-preliminary-findings
#7
Soumya Ghose, Rakesh Shiradkar, Mirabela Rusu, Jhimli Mitra, Rajat Thawani, Michael Feldman, Amar C Gupta, Andrei S Purysko, Lee Ponsky, Anant Madabhushi
Early identification of PCa patients at risk for biochemical recurrence (BCR) post-therapy will potentially complement definitive therapy with either neo- or adjuvant therapy to improve prognosis. BCR post definitive therapy is often associated with disease progression that might cause a bulge in the prostate gland. In this work we explored if an atlas-based comparison approach reveals shape differences in the prostate capsule as observed on pre-treatment T2-weighted MRI between prostate cancer patients who do (BCR (+)) and do not (BCR (-)) have BCR following definitive therapy...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158158/magnetic-resonance-enterography-to-assess-multifocal-and-multicentric-bowel-endometriosis
#8
Krystel Nyangoh Timoh, Zelda Stewart, Mikhael Benjoar, Selma Beldjord, Marcos Ballester, Marc Bazot, Isabelle Thomassin-Naggara, Emile Daraï
STUDY OBJECTIVE: To prospectively determine the accuracy of magnetic resonance enterography (MRE) compared with conventional magnetic resonance imaging (MRI) for multifocal (i.e., multiple lesions affecting the same digestive segment) and multicentric (i.e., multiple lesions affecting several digestive segments) bowel endometriosis. DESIGN: Prospective study (Canadian Task Force classification II-2). SETTING: Tenon University Hospital, Paris, France...
November 17, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/29157745/differential-diagnosis-of-parkinsonian-syndromes-using-dopamine-transporter-and-perfusion-spect
#9
Shigetoshi Takaya, Nobukatsu Sawamoto, Tomohisa Okada, Gosuke Okubo, Sei Nishida, Kaori Togashi, Hidenao Fukuyama, Ryosuke Takahashi
OBJECTIVE: We aimed to assess whether a combined analysis of dopamine transporter (DAT)- and perfusion-SPECT images (or either) could: (1) distinguish atypical parkinsonian syndromes (APS) from Lewy body diseases (LBD; majority Parkinson disease [PD]), and (2) differentiate among APS subgroups (progressive supranuclear palsy [PSP], corticobasal syndrome [CBS], and multiple system atrophy [MSA]). METHODS: We recruited consecutive patients with neurodegenerative parkinsonian syndromes (LBD, n = 46; APS, n = 33)...
November 14, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29157260/high-resolution-and-accelerated-multi-parametric-mapping-with-automated-characterization-of-vessel-disease-using-intravascular-mri
#10
Guan Wang, Yi Zhang, Shashank Sathyanarayana Hegde, Paul A Bottomley
BACKGROUND: Atherosclerosis is prevalent in cardiovascular disease, but present imaging modalities have limited capabilities for characterizing lesion stage, progression and response to intervention. This study tests whether intravascular magnetic resonance imaging (IVMRI) measures of relaxation times (T1, T2) and proton density (PD) in a clinical 3 Tesla scanner could characterize vessel disease, and evaluates a practical strategy for accelerated quantification. METHODS: IVMRI was performed in fresh human artery segments and swine vessels in vivo, using fast multi-parametric sequences, 1-2 mm diameter loopless antennae and 200-300 μm resolution...
November 20, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29156413/anterior-posterior-gradient-differences-in-lobar-and-cingulate-cortex-cerebral-blood-flow-in-late-life-depression
#11
Margarita Abi Zeid Daou, Brian D Boyd, Manus J Donahue, Kimberly Albert, Warren D Taylor
Vascular pathology is common in late-life depression, contributing to changes in cerebral function. We examined whether late-life depression was associated with differences in cerebral blood flow (CBF) and whether such differences were related to vascular risk and cerebrovascular pathology, specifically white matter hyperintensity (WMH) volumes. Twenty-three depressed elders and 20 age- and sex-matched elders with no psychiatric history completed cranial 3T MRI. MRI procedures included a pseudo-continuous Arterial Spin Labeling (pcASL) acquisition obtained while on room air and during a hypercapnia challenge allowing for calculation of cerebrovascular reactivity (CVR)...
November 11, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29154312/significant-mri-indicators-of-malignancy-for-breast-non-mass-enhancement
#12
Quan-Xin Yang, Xing Ji, Lin-Lin Feng, Long Zheng, Xiao-Qian Zhou, Qian Wu, Xin Chen
OBJECTIVE: To explore and evaluate new malignant predictors of breast non-mass enhancement lesions using the new BI-RADS MRI lexicon. METHODS: A dataset involving 422 consecutive women underwent breast 3.0 T MRI between January 2014 and July 2016 was assembled for this study. Each case was retrospectively reviewed by 3 radiologists. Eighty-four lesions that present non-mass enhancement in 79 patients were identified in the study. Dynamic contrast-enhanced MRI features were analyzed using univariate and multivariate analyses to identify significant indicators of malignancy...
November 16, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29153369/retrospective-comparison-of-three-dimensional-imaging-sequences-in-the-visualization-of-posterior-fossa-cranial-nerves
#13
Suna Ors, Ercan Inci, Rustu Turkay, Atilla Kokurcan, Elif Hocaoglu
PURPOSE: To compare efficancy of three-dimentional SPACE (sampling perfection with application-optimized contrasts using different flip-angle evolutions) and CISS (constructive interference in steady state) sequences in the imaging of the cisternal segments of cranial nerves V-XII. METHODS: Temporal MRI scans from 50 patients (F:M ratio, 27:23; mean age, 44.5±15.9 years) admitted to our hospital with vertigo, tinnitus, and hearing loss were retrospectively analyzed...
December 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29151041/assessment-of-thrombus-length-in-acute-ischemic-stroke-by-post-contrast-magnetic-resonance-angiography
#14
Ramanan Ganeshan, Alexander H Nave, Jan F Scheitz, Katharina A Schindlbeck, Karl Georg Haeusler, Christian H Nolte, Kersten Villringer, Jochen B Fiebach
OBJECTIVES: Post-contrast magnetic resonance angiography (PC-MRA) enables visualization of vessel segments distal to an intra-arterial thrombus in acute ischemic stroke. We hypothesized that PC-MRA also allows clot length measurement in different intracranial vessels. METHODS: Patients with MRI-confirmed ischemic stroke and intracranial artery occlusion within 24 hours of symptom onset were prospectively evaluated. PC-MRA was added to a standard stroke MRI protocol...
November 18, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29150799/a-hybrid-approach-based-on-logistic-classification-and-iterative-contrast-enhancement-algorithm-for-hyperintense-multiple-sclerosis-lesion-segmentation
#15
Antonio Carlos da Silva Senra Filho
Multiple sclerosis (MS) is a neurodegenerative disease with increasing importance in recent years, in which the T2 weighted with fluid attenuation inversion recovery (FLAIR) MRI imaging technique has been addressed for the hyperintense MS lesion assessment. Many automatic lesion segmentation approaches have been proposed in the literature in order to assist health professionals. In this study, a new hybrid lesion segmentation approach based on logistic classification (LC) and the iterative contrast enhancement (ICE) method is proposed (LC+ICE)...
November 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29148253/quantification-of-vascular-damage-in-acute-kidney-injury-with-fluorine-magnetic-resonance-imaging-and-spectroscopy
#16
Jeremy K Moore, Junjie Chen, Hua Pan, Joseph P Gaut, Sanjay Jain, Samuel A Wickline
PURPOSE: To design a fluorine MRI/MR spectroscopy approach to quantify renal vascular damage after ischemia-reperfusion injury, and the therapeutic response to antithrombin nanoparticles (NPs) to protect kidney function. METHODS: A total of 53 rats underwent 45 min of bilateral renal artery occlusion and were treated at reperfusion with either plain perfluorocarbon NPs or NPs functionalized with a direct thrombin inhibitor (PPACK:phenyalanine-proline-arginine-chloromethylketone)...
November 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29145838/mri-characteristics-for-phantom-scratching-in-canine-syringomyelia
#17
Zoe R Nalborczyk, Angus K McFadyen, Jelena Jovanovik, Anna Tauro, Colin J Driver, Noel Fitzpatrick, Susan P Knower, Clare Rusbridge
BACKGROUND: A classic sign of canine syringomyelia (SM) is scratching towards one shoulder. Using magnetic resonance imaging (MRI) we investigate the spinal cord lesion relating to this phenomenon which has characteristics similar to fictive scratch secondary to spinal cord transection. Medical records were searched for Cavalier King Charles spaniels with a clinical and MRI diagnosis of symptomatic SM associated with Chiari-like malformation (CM). The cohort was divided into SM with phantom scratching (19 dogs) and SM but no phantom scratching (18 dogs)...
November 16, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29145754/cortical-and-subcortical-brain-morphometry-differences-between-patients-with-autism-spectrum-disorder-and-healthy-individuals-across-the-lifespan-results-from-the-enigma-asd-working-group
#18
Daan van Rooij, Evdokia Anagnostou, Celso Arango, Guillaume Auzias, Marlene Behrmann, Geraldo F Busatto, Sara Calderoni, Eileen Daly, Christine Deruelle, Adriana Di Martino, Ilan Dinstein, Fabio Luis Souza Duran, Sarah Durston, Christine Ecker, Damien Fair, Jennifer Fedor, Jackie Fitzgerald, Christine M Freitag, Louise Gallagher, Ilaria Gori, Shlomi Haar, Liesbeth Hoekstra, Neda Jahanshad, Maria Jalbrzikowski, Joost Janssen, Jason Lerch, Beatriz Luna, Mauricio Moller Martinho, Jane McGrath, Filippo Muratori, Clodagh M Murphy, Declan G M Murphy, Kirsten O'Hearn, Bob Oranje, Mara Parellada, Alessandra Retico, Pedro Rossa, Katya Rubia, Devon Shook, Margot Taylor, Paul M Thompson, Michela Tosetti, Gregory L Wallace, Fengfeng Zhou, Jan K Buitelaar
OBJECTIVE: Neuroimaging studies show structural differences in both cortical and subcortical brain regions in children and adults with autism spectrum disorder (ASD) compared with healthy subjects. Findings are inconsistent, however, and it is unclear how differences develop across the lifespan. The authors investigated brain morphometry differences between individuals with ASD and healthy subjects, cross-sectionally across the lifespan, in a large multinational sample from the Enhancing Neuroimaging Genetics Through Meta-Analysis (ENIGMA) ASD working group...
November 17, 2017: American Journal of Psychiatry
https://www.readbyqxmd.com/read/29141363/-characteristics-of-high-resolution-diffusion-weighted-imaging-apparent-diffusion-coefficient-histogram-and-its-correlations-with-cancer-stages-in-patients-with-nasopharyngeal-carcinoma
#19
G J Wang, Y Wang, Y Ye, F Chen, Y T Lu, S L Li
Objective: To investigate the features of apparent diffusion coefficient (ADC) histogram parameters based on entire tumor volume data in high resolution diffusion weighted imaging of nasopharyngeal carcinoma (NPC) and to evaluate its correlations with cancer stages. Methods: This retrospective study included 154 cases of NPC patients[102 males and 52 females, mean age (48±11) years]who had received readout segmentation of long variable echo trains of MRI scan before radiation therapy. The area of tumor was delineated on each section of axial ADC maps to generate ADC histogram by using Image J...
November 7, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29140576/comparison-between-qualitative-and-quantitative-assessment-of-background-parenchymal-enhancement-on-breast-mri
#20
Akshat C Pujara, Artem Mikheev, Henry Rusinek, Yiming Gao, Chloe Chhor, Kristine Pysarenko, Harikrishna Rallapalli, Jerzy Walczyk, Melanie Moccaldi, James S Babb, Amy N Melsaether
BACKGROUND: Potential clinical implications of the level of background parenchymal enhancement (BPE) on breast MRI are increasing. Currently, BPE is typically evaluated subjectively. Tests of concordance between subjective BPE assessment and computer-assisted quantified BPE have not been reported. PURPOSE OR HYPOTHESIS: To compare subjective radiologist assessment of BPE with objective quantified parenchymal enhancement (QPE). STUDY TYPE: Cross-sectional observational study...
November 15, 2017: Journal of Magnetic Resonance Imaging: JMRI
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