keyword
MENU ▼
Read by QxMD icon Read
search

T2 map

keyword
https://www.readbyqxmd.com/read/29788740/multiparametric-mri-analysis-of-morphologico-functional-features-of-dcis-correlation-with-grade-of-nuclear-atypia
#1
V Lehotska, K Rauova, L Vanovcanova
The aim was to analyze morphologico-functional characteristics of ductal carcinoma in situ (DCIS) in breast MRI to assess signs correlating with the degree of nuclear atypia. From 636 malignant lesions, 114 were DCIS (17.92%): 44 cases of high-grade (38.60%), 37 intermediate (32.45%), 33 low-grade (28.95%). MRI characteristics - T2 signal intensity (SI), shape, margins, contrast enhancement, peripheral/ductal enhancement, kinetic curve, presence of restriction of diffusion were correlated with the nuclear grade of DCIS...
March 14, 2018: Neoplasma
https://www.readbyqxmd.com/read/29780855/magnetic-resonance-imaging-and-histopathological-visualization-of-human-dural-lymphatic-vessels
#2
Seung-Kwon Ha, Govind Nair, Martina Absinta, Nicholas J Luciano, Daniel S Reich
In this protocol, we describe a method to visualize and map dural lymphatic vessels in-vivo using magnetic resonance imaging (MRI) and ex-vivo using histopathological techniques. While MRI protocols for routine imaging of meningeal lymphatics include contrast-enhanced T2-FLAIR and T1- weighted black-blood imaging, a more specific 3D mapping of the lymphatic system can be obtained by administering two distinct gadolinium-based MRI contrast agents on different days (gadofosveset and gadobutrol) and subsequently processing images acquired before and after administration of each type of contrast...
April 20, 2018: Bio-protocol
https://www.readbyqxmd.com/read/29774398/improved-detection-of-a-tumorous-involvement-of-the-mesorectal-fascia-and-locoregional-lymph-nodes-in-locally-advanced-rectal-cancer-using-dce-mri
#3
Marco Armbruster, Melvin D'Anastasi, Veronika Holzner, Martin E Kreis, Olaf Dietrich, Bernhard Brandlhuber, Anno Graser, Martina Brandlhuber
PURPOSE: The prediction of an infiltration of the mesorectal fascia (MRF) and malignant lymph nodes is essential for treatment planning and prognosis of patients with rectal cancer. The aim of this study was to assess the additional diagnostic value of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) for the detection of a malignant involvement of the MRF and of mesorectal lymph nodes in patients with locally advanced rectal cancer. METHODS: In this prospective study, 22 patients with locally advanced rectal cancer were examined with 1...
May 17, 2018: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/29772956/lumbar-muscle-structure-predicts-operational-postures-in-active-duty-marines
#4
David B Berry, Bahar Shahidi, Ana E Rodríguez-Soto, Jan M Hughes-Austin, Karen R Kelly, Samuel R Ward
Study Design Cross-sectional. Background The relationship between lumbar spine posture and muscle structure is not well understood. Objectives Investigate the predictive capacity of muscle structure on lumbar spine posture in active duty Marines. Methods Fouty-three Marines were scanned using an upright magnetic resonance imaging (MRI) scanner while standing unloaded and standing, sitting, and prone on elbows with body armor. Cobb, horizontal, and sacral angles were measured. Marines were then scanned unloaded in supine using a supine MRI scanner...
May 17, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29770486/direct-estimation-of-17-o-mr-images-diesis-for-quantification-of-oxygen-metabolism-in-the-human-brain-with-partial-volume-correction
#5
Dmitry Kurzhunov, Robert Borowiak, Marco Reisert, Ali Caglar Özen, Michael Bock
PURPOSE: To provide a data post-processing method that corrects for partial volume effects (PVE) and fast T2* decay in dynamic 17 O MRI for the mapping of cerebral metabolic rates of oxygen consumption (CMRO2 ). METHODS: CMRO2 is altered in neurodegenerative diseases and tumors and can be measured after 17 O gas inhalation using dynamic 17 O MRI. CMRO2 quantification is difficult because of PVE. To correct for PVE, a direct estimation of the MR images (DIESIS) method is proposed and used in 4 dynamic 17 O MRI data sets of a healthy volunteer acquired on a 3T MRI system...
May 16, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29763672/using-3d-spatial-correlations-to-improve-the-noise-robustness-of-multi-component-analysis-of-3d-multi-echo-quantitative-t2-relaxometry-data
#6
Dushyant Kumar, Hari Hariharan, Tobias D Faizy, Patrick Borchert, Susanne Siemonsen, Jens Fiehler, Ravinder Reddy, Jan Sedlacik
PURPOSE: We present a computationally feasible and iterative multi-voxel spatially regularized algorithm for myelin water fraction (MWF) reconstruction. This method utilizes 3D spatial correlations present in anatomical/pathological tissues and underlying B1+ -inhomogeneity or flip angle inhomogeneity to enhance the noise robustness of the reconstruction while intrinsically accounting for stimulated echo contributions using T2-distribution data alone. METHODS: Simulated data and in vivo data acquired using 3D non-selective multi-echo spin echo (3DNS-MESE) were used to compare the reconstruction quality of the proposed approach against those of the popular algorithm (the method by Prasloski et al...
May 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29762089/juvenile-osteochondritis-dissecans-cartilage-t2-mapping-of-stable-medial-femoral-condyle-lesions
#7
Jie C Nguyen, Fang Liu, Donna G Blankenbaker, Kaitlin M Woo, Richard Kijowski
Purpose To determine whether a T2 mapping sequence could depict early changes in the composition and microstructure of cartilage overlying stable lesions of the medial femoral condyle in patients with juvenile osteochondritis dissecans (JOCD). Materials and Methods This retrospective study analyzed a sagittal T2 mapping sequence performed between September 1, 2015, and March 31, 2017, on 16 patients (10 boys and six girls; median age, 11.5 years) with 18 stable medial femoral condyle JOCD lesions and 18 age-, sex-, and skeletal maturation-matched control participants (11 boys and seven girls; median age, 11...
May 15, 2018: Radiology
https://www.readbyqxmd.com/read/29761595/radiomics-analysis-of-apparent-diffusion-coefficient-in-cervical-cancer-a-preliminary-study-on-histological-grade-evaluation
#8
Ying Liu, Yuwei Zhang, Runfen Cheng, Shichang Liu, Fangyuan Qu, Xiaoyu Yin, Qin Wang, Bohan Xiao, Zhaoxiang Ye
BACKGROUND: The role of apparent diffusion coefficient (ADC)-based radiomics features in evaluating histopathological grade of cervical cancer is unresolved. PURPOSE: To determine if there is a difference between radiomics features derived from center-slice 2D versus whole-tumor volumetric 3D for ADC measurements in patients with cervical cancer regarding tumor histopathological grade, and systematically assess the impact of the b value on radiomics analysis in ADC quantifications...
May 14, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29756609/impact-of-resection-margin-status-on-oncological-outcomes-after-co2-laser-cordectomy
#9
P Aluffi Valletti, F Taranto, A Chiesa, F Pia, G Valente
The management of positive resection margins in micro-endoscopic glottic laser surgery remains a controversial and critical point. This study aims to assess the impact of margin status after transoral laser surgery on local control, survival and organ preservation rates; the decision-making process and treatment options in cases with positive margins are also discussed. We retrospectively reviewed the clinical and histological records of 308 consecutive patients with primary early glottic carcinoma (T1a, T1b, selected T2) and treated with endoscopic laser cordectomy...
February 2018: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/29756231/susceptibility-mri-captures-nigral-pathology-in-patients-with-parkinsonian-syndromes
#10
Mechelle M Lewis, Guangwei Du, Jennifer Baccon, Amanda M Snyder, Ben Murie, Felicia Cooper, Christy Stetter, Lan Kong, Christopher Sica, Richard B Mailman, James R Connor, Xuemei Huang
BACKGROUND: Parkinsonisms are neurodegenerative disorders characterized pathologically by α-synuclein-positive (e.g., PD, diffuse Lewy body disease, and MSA) and/or tau-positive (e.g., PSP, cortical basal degeneration) pathology. Using R2* and quantitative susceptibility mapping, susceptibility changes have been reported in the midbrain of living parkinsonian patients, although the exact underlying pathology of these alterations is unknown. OBJECTIVE: The current study investigated the pathological correlates of these susceptibility MRI measures...
May 14, 2018: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/29755652/correlation-of-mdr1-gene-polymorphism-with-propofol-combined-with-remifentanil-anesthesia-in-pediatric-tonsillectomy
#11
YunLong Zhang, Yongpei Li, Hongfa Wang, Fang Cai, Sheliang Shen, Xiaopan Luo
The motive of this study was to investigate the interaction between polymorphisms in the MDR1 gene and anesthetic effects following pediatric tonsillectomy. In total, 240 children undergoing tonsillectomy with preoperative propofol-remifentanil anesthesia were selected. Genomic DNA was extracted from the peripheral blood of children after operation, and the MDR1 gene polymorphisms of 2677 G>T/A, 1236 C>T and 3435 C>T were detected by direct sequencing. We tested mean arterial pressure, diastolic blood pressure, systolic blood pressure, and heart rate at several time-points: T0 (5 mins after the repose), T1 (0 min after tracheal intubation), T2 (5 mins after the tracheal intubation), T3 (0 min after the tonsillectomy), T4 (0 min after removal of the mouth-gag) and T5 (5 min after the extubation)...
April 17, 2018: Oncotarget
https://www.readbyqxmd.com/read/29751322/gait-deviations-in-duchenne-muscular-dystrophy-part-2-statistical-non-parametric-mapping-to-analyze-gait-deviations-in-children-with-duchenne-muscular-dystrophy
#12
Marije Goudriaan, Marleen Van den Hauwe, Cristina Simon-Martinez, Catherine Huenaerts, Guy Molenaers, Nathalie Goemans, Kaat Desloovere
BACKGROUND: Prolonged ambulation is considered important in children with Duchenne muscular dystrophy (DMD). However, previous studies analyzing DMD gait were sensitive to false positive outcomes, caused by uncorrected multiple comparisons, regional focus bias, and inter-component covariance bias. Also, while muscle weakness is often suggested to be the main cause for the altered gait pattern in DMD, this was never verified. RESEARCH QUESTION: Our research question was twofold: 1) are we able to confirm the sagittal kinematic and kinetic gait alterations described in a previous review with statistical non-parametric mapping (SnPM)? And 2) are these gait deviations related to lower limb weakness? METHODS: We compared gait kinematics and kinetics of 15 children with DMD and 15 typical developing (TD) children (5-17 years), with a two sample Hotelling's T2 test and post-hoc two-tailed, two-sample t-test...
April 30, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29748204/a-qualitative-and-quantitative-correlation-study-of-lumbar-intervertebral-disc-degeneration-using-glycosaminoglycan-chemical-exchange-saturation-transfer-pfirrmann-grade-and-t1-%C3%AF
#13
O Togao, A Hiwatashi, T Wada, K Yamashita, K Kikuchi, C Tokunaga, J Keupp, M Yoneyama, H Honda
BACKGROUND AND PURPOSE: Glycosaminoglycan chemical exchange saturation transfer (gagCEST) imaging allows the direct measurement and mapping of glycosaminoglycans. In this study, we aimed to evaluate the usefulness of gagCEST imaging in the quantitative assessment of intervertebral disc degeneration in a comparison with Pfirrmann grade and T1-ρ measurements. MATERIALS AND METHODS: Ninety-six lumbar intervertebral discs in 24 volunteers (36.0 ± 8.5 years of age, 21 men and 3 women) were examined with both gagCEST imaging and T1-ρ measurements...
May 10, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29748200/extent-of-microstructural-tissue-damage-correlates-with-hemodynamic-failure-in-high-grade-carotid-occlusive-disease-an-mri-study-using-quantitative-t2-and-dsc-perfusion
#14
A Seiler, R Deichmann, U Nöth, A Lauer, W Pfeilschifter, O C Singer, M Wagner
BACKGROUND AND PURPOSE: Chronic hemodynamic impairment in high-grade carotid occlusive disease is thought to cause microstructural abnormalities that might be subclinical or lead to subtle symptoms including cognitive impairment. Quantitative MR imaging allows assessing pathologic structural changes beyond macroscopically visible tissue damage. In this study, high-resolution quantitative T2 mapping combined with DSC-based PWI was used to investigate quantitative T2 changes as a potential marker of microstructural damage in relation to hemodynamic impairment in patients with unilateral high-grade carotid occlusive disease...
May 10, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29747290/-the-relationship-between-arterial-blood-lactate-clearance-prognosis-and-myocardial-damage-in-patients-with-septic-shock-after-early-goal-directed-therapy
#15
X L Shang, D W Liu, X T Wang, H W He, H M Zhang, L X Su, P Pan
Objective: To evaluate the prognostic value of arterial blood lactate clearance based on central venous oxygen saturation and perfusion index in patients with septic shock related myocardial injury after early goal-directed therapy. Methods: One hundred and fifty-seven patients with septic shock after early resuscitation were enrolled from August 2013 to July 2016 in ICU at Peking Union Medical College Hospital. Parameters indicating early resuscitation included central venous pressure (CVP) 8-12 mmHg (1 mmHg=0...
May 1, 2018: Zhonghua Nei Ke za Zhi [Chinese Journal of Internal Medicine]
https://www.readbyqxmd.com/read/29744935/fast-magnetic-resonance-fingerprinting-for-dynamic-contrast-enhanced-studies-in-mice
#16
Yuning Gu, Charlie Y Wang, Christian E Anderson, Yuchi Liu, He Hu, Mette L Johansen, Dan Ma, Yun Jiang, Ciro Ramos-Estebanez, Susann Brady-Kalnay, Mark A Griswold, Chris A Flask, Xin Yu
PURPOSE: The goal of this study was to develop a fast MR fingerprinting (MRF) method for simultaneous T1 and T2 mapping in DCE-MRI studies in mice. METHODS: The MRF sequences based on balanced SSFP and fast imaging with steady-state precession were implemented and evaluated on a 7T preclinical scanner. The readout used a zeroth-moment-compensated variable-density spiral trajectory that fully sampled the entire k-space and the inner 10 × 10 k-space with 48 and 4 interleaves, respectively...
May 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29740964/white-matter-tract-network-disruption-explains-reduced-conscientiousness-in-multiple-sclerosis
#17
Tom A Fuchs, Michael G Dwyer, Amy Kuceyeski, Sanjeevani Choudhery, Keith Carolus, Xian Li, Matthew Mallory, Bianca Weinstock-Guttman, Dejan Jakimovski, Deepa Ramasamy, Robert Zivadinov, Ralph H B Benedict
Quantifying white matter (WM) tract disruption in people with multiple sclerosis (PwMS) provides a novel means for investigating the relationship between defective network connectivity and clinical markers. PwMS exhibit perturbations in personality, where decreased Conscientiousness is particularly prominent. This trait deficit influences disease trajectory and functional outcomes such as work capacity. We aimed to identify patterns of WM tract disruption related to decreased Conscientiousness in PwMS. Personality assessment and brain MRI were obtained in 133 PwMS and 49 age- and sex-matched healthy controls (HC)...
May 8, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29738908/rodent-cerebral-blood-volume-cbv-changes-during-hypercapnia-observed-using-magnetic-particle-imaging-mpi-detection
#18
Clarissa Zimmerman Cooley, Joseph B Mandeville, Erica E Mason, Emiri T Mandeville, Lawrence L Wald
Magnetic Particle Imaging (MPI) is a rapidly developing imaging modality that directly measures and maps the concentration of injected superparamagnetic iron oxide nanoparticles (SPIOs). Since the agent does not cross the blood-brain barrier, cerebral SPIO concentration provides a direct probe of Cerebral Blood Volume (CBV). Here we provide an initial demonstration of the ability of MPI to detect functional CBV changes (fCBV) by monitoring SPIO concentration during hypercapnic manipulation in a rat model. As a tracer detection method, MPI offers a more direct probe of agent concentration and therefore fCBV than MRI measurements in which the agent is indirectly detected through perturbation of water relaxation time constants such as T2 ∗ ...
May 5, 2018: NeuroImage
https://www.readbyqxmd.com/read/29734491/oxygenation-sensitive-cardiovascular-magnetic-resonance-in-hypertensive-heart-disease-with-left-ventricular-myocardial-hypertrophy-and-non-left-ventricular-myocardial-hypertrophy-insight-from-altered-mechanics-and-cardiac-bold-imaging
#19
Bing-Hua Chen, Rui Wu, Dong-Aolei An, Ruo-Yang Shi, Qiu-Ying Yao, Qing Lu, Jiani Hu, Meng Jiang, James Deen, Ankush Chandra, Jian-Rong Xu, Lian-Ming Wu
BACKGROUND: BOLD (blood oxygen level dependent) MRI can detect regional condition of myocardial oxygen supply and demand by means of paramagnetic properties. PURPOSE: Noninvasive assessment of myocardial oxygenation by BOLD MRI in hypertensive patients with hypertension (HTN) left ventricular myocardial hypertrophy (LVMH) and HTN non-LVMH and its correlation with myocardial mechanics were performed. STUDY TYPE: Prospective. POPULATION: Twenty patients with HTN LVMH, 21 patients with HTN non-LVMH, and 23 normotensive controls were enrolled...
May 7, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29734489/diagnostic-performance-of-intravoxel-incoherent-motion-diffusion-weighted-imaging-in-the-assessment-of-the-dynamic-status-of-myocardial-perfusion
#20
Dong-Aolei An, Bing-Hua Chen, Rui-Wu, Ruo-Yang Shi, Jun Bu, Heng Ge, Jiani Hu, Jian-Rong Xu, Lian-Ming Wu
BACKGROUND: Acute myocardial infarction (AMI) is a major cause of morbidity and mortality worldwide and places a significant financial burden on our society. PURPOSE: To determine the feasibility of cardiac intravoxel incoherent motion (IVIM) in the consecutive evaluation of myocardial perfusion in myocardial infarction patients postpercutaneous coronary intervention (PCI) and to investigate the dynamic biological phenomena in myocardial perfusion after AMI. STUDY TYPE: Prospective observational study...
May 7, 2018: Journal of Magnetic Resonance Imaging: JMRI
keyword
keyword
82905
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"