keyword
MENU ▼
Read by QxMD icon Read
search

T2 map

keyword
https://www.readbyqxmd.com/read/29352378/can-histogram-analysis-of-mr-images-predict-aggressiveness-in-pancreatic-neuroendocrine-tumors
#1
Riccardo De Robertis, Bogdan Maris, Nicolò Cardobi, Paolo Tinazzi Martini, Stefano Gobbo, Paola Capelli, Silvia Ortolani, Sara Cingarlini, Salvatore Paiella, Luca Landoni, Giovanni Butturini, Paolo Regi, Aldo Scarpa, Giampaolo Tortora, Mirko D'Onofrio
OBJECTIVES: To evaluate MRI derived whole-tumour histogram analysis parameters in predicting pancreatic neuroendocrine neoplasm (panNEN) grade and aggressiveness. METHODS: Pre-operative MR of 42 consecutive patients with panNEN >1 cm were retrospectively analysed. T1-/T2-weighted images and ADC maps were analysed. Histogram-derived parameters were compared to histopathological features using the Mann-Whitney U test. Diagnostic accuracy was assessed by ROC-AUC analysis; sensitivity and specificity were assessed for each histogram parameter...
January 19, 2018: European Radiology
https://www.readbyqxmd.com/read/29352234/bi-exponential-3d-t1%C3%AF-mapping-of-whole-brain-at-3%C3%A2-t
#2
Rajiv G Menon, Azadeh Sharafi, Johannes Windschuh, Ravinder R Regatte
Detection of multiple relaxation pools using MRI is useful in a number of neuro-pathologies including multiple sclerosis (MS), Alzheimer's, and stroke. In this study we evaluate the feasibility of using T1ρ imaging for the detection of bi-exponential decays in the human brain. A prospective T1ρ imaging study was performed on model relaxation phantoms (eggs) and 7 healthy volunteers. The data was fitted using a single pool and a 2-pool model to estimate mono- and bi-exponential T1ρ maps, respectively. Bi-exponential decays were identified in the gray matter (GM) and white matter (WM) of the brain with 40...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29351339/brain-functional-bold-perturbation-modelling-for-forward-fmri-and-inverse-mapping
#3
Zikuan Chen, Jennifer Robinson, Vince Calhoun
PURPOSE: To computationally separate dynamic brain functional BOLD responses from static background in a brain functional activity for forward fMRI signal analysis and inverse mapping. METHODS: A brain functional activity is represented in terms of magnetic source by a perturbation model: χ = χ0 +δχ, with δχ for BOLD magnetic perturbations and χ0 for background. A brain fMRI experiment produces a timeseries of complex-valued images (T2* images), whereby we extract the BOLD phase signals (denoted by δP) by a complex division...
2018: PloS One
https://www.readbyqxmd.com/read/29343659/cardiac-mr-imaging-of-hypertrophic-cardiomyopathy-techniques-findings-and-clinical-relevance
#4
Yasuo Amano, Mitsunobu Kitamura, Hitoshi Takano, Fumi Yanagisawa, Masaki Tachi, Yasuyuki Suzuki, Shinichiro Kumita, Morimasa Takayama
Hypertrophic cardiomyopathy (HCM) is a relatively common myocardial genetic disease having a wide variety of symptoms and prognoses. The most serious complications of HCM are sudden cardiac death induced by ventricular arrhythmia or inappropriate changes in blood pressure, and heart failure. Cardiac MR imaging is a valuable imaging method for detecting HCM because of its accurate measurement of wall thickness and myocardial mass without limited view and the unique ability of late gadolinium enhancement (LGE) to identify myocardial fibrosis related to the prognosis of HCM...
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29342064/minimally-manipulated-bone-marrow-concentrate-compared-with-microfracture-treatment-of-full-thickness-chondral-defects-a-one-year-study-in-an-equine-model
#5
Constance R Chu, Lisa A Fortier, Ashley Williams, Karin A Payne, Taralyn M McCarrel, Megan E Bowers, Diego Jaramillo
BACKGROUND: Microfracture is commonly performed for cartilage repair but usually results in fibrocartilage. Microfracture augmented by autologous bone marrow concentrate (BMC) was previously shown to yield structurally superior cartilage repairs in an equine model compared with microfracture alone. The current study was performed to test the hypothesis that autologous BMC without concomitant microfracture improves cartilage repair compared with microfracture alone. METHODS: Autologous sternal bone marrow aspirate (BMA) was concentrated using a commercial system...
January 17, 2018: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/29341356/all-over-the-map-an-interobserver-agreement-study-of-tumor-location-based-on-the-pi-radsv2-sector-map
#6
Matthew D Greer, Joanna H Shih, Tristan Barrett, Sandra Bednarova, Ismail Kabakus, Yan Mee Law, Haytham Shebel, Maria J Merino, Bradford J Wood, Peter A Pinto, Peter L Choyke, Baris Turkbey
BACKGROUND: Prostate imaging reporting and data system version 2 (PI-RADSv2) recommends a sector map for reporting findings of prostate cancer mulitparametric MRI (mpMRI). Anecdotally, radiologists may demonstrate inconsistent reproducibility with this map. PURPOSE: To evaluate interobserver agreement in defining prostate tumor location on mpMRI using the PI-RADSv2 sector map. STUDY TYPE: Retrospective. POPULATION: Thirty consecutive patients who underwent mpMRI between October, 2013 and March, 2015 and who subsequently underwent prostatectomy with whole-mount processing...
January 17, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29339314/surface-based-characteristics-of-the-cerebellar-cortex-visualized-with-ultra-high-field-mri
#7
Yohan Boillat, Pierre-Louis Bazin, Kieran O'Brien, Mário João Fartaria, Guillaume Bonnier, Gunnar Krueger, Wietske Van der Zwaag, Cristina Granziera
Although having a relatively homogeneous cytoarchitectonic organization, the cerebellar cortex is a heterogeneous region characterized by different amounts of myelin, iron and protein expression profiles. In this study, we used quantitative T1 and T2* mapping at ultra-high field (7T) MRI to investigate the tissue characteristics of the cerebellar gray matter surface and its layers. Detailed subject-specific surfaces were generated at three different cortical depths and averaged across subjects to create averaged T1 and T2* maps on the cerebellar surface...
January 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29337367/correlation-of-simulation-finite-element-analysis-to-the-separation-of-intrinsically-magnetic-spores-and-red-blood-cells-using-a-microfluidic-magnetic-deposition-system
#8
Jianxin Sun, L Moore, Wei Xue, James Kim, Maciej Zborowski, Jeffrey J Chalmers
Magnetic separation of cells has been, and continues to be, widely used in a variety of applications, ranging from healthcare diagnostics to detection of food contamination. Typical, these technologies require cells labeled with antibody magnetic particle conjugate and a high magnetic energy gradient created in the flow containing the labeled cells (i.e. a column packed with magnetically inducible material), or dense packing of magnetic particles next to the flow cell. Such designs while creating high magnetic energy gradients, are not amenable to easy, highly detailed, mathematic characterization...
January 16, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29336387/dexmedetomidine-for-prevention-of-skeletal-muscle-ischaemia-reperfusion-injury-in-patients-with-chronic-limb-ischaemia-undergoing-aortobifemoral-bypass-surgery-a-prospective-double-blind-randomized-controlled-study
#9
Tanveer Singh Kundra, Ashwini Thimmarayappa, Manasa Dhananjaya, N Manjunatha
BACKGROUND: Dexmedetomidine is a selective α-2 agonist used for sedation. It has also been shown to have myocardial protective effect and prevent ischemia-reperfusion injury in off-pump coronary artery bypass patients. The aim of our study was to assess the effect of dexmedetomidine for prevention of skeletal muscle ischemia-reperfusion injury in patients undergoing aortobifemoral bypass surgery. METHODOLOGY: Sixty adult patients (Group dexmedetomidine n = 30, Group normal saline n = 30) undergoing aortobifemoral bypass surgery were recruited over 3 months...
January 2018: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/29325780/longitudinal-atlas-for-normative-human-brain-development-and-aging-over-the-lifespan-using-quantitative-susceptibility-mapping
#10
Yuyao Zhang, Hongjiang Wei, Matthew J Cronin, Naying He, Fuhua Yan, Chunlei Liu
Longitudinal brain atlases play an important role in the study of human brain development and cognition. Existing atlases are mainly based on anatomical features derived from T1-and T2-weighted MRI. A 4D developmental quantitative susceptibility mapping (QSM) atlas may facilitate the estimation of age-related iron changes in deep gray matter nuclei and myelin changes in white matter. To this end, group-wise co-registered QSM templates were generated over various age intervals from age 1-83 years old. Registration was achieved by combining both T1-weighted and QSM images...
January 8, 2018: NeuroImage
https://www.readbyqxmd.com/read/29323549/predicting-parametrial-invasion-in-cervical-carcinoma-stages-ib1-ib2-and-iia-diagnostic-accuracy-of-t2-weighted-imaging-combined-with-dwi-at-3-t
#11
Jin-Rong Qu, Lei Qin, Xiang Li, Jun-Peng Luo, Jing Li, Hong-Kai Zhang, Li Wang, Nan-Nan Shao, Shou-Ning Zhang, Yan-Le Li, Cui-Cui Liu, Hai-Liang Li
OBJECTIVE: The objective of our study was to retrospectively evaluate the efficacy of combined analysis of T2-weighted imaging and DWI in the diagnosis of parametrial invasion (PMI) in cervical carcinoma. MATERIALS AND METHODS: The clinical records of 192 patients with cervical carcinoma who met the study requirements were reviewed for this retrospective study. The signal intensities of suspicious PMI tissue were assessed on T2-weighted images, DW images, and apparent diffusion coefficient maps independently by two experienced radiologists...
January 11, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29322233/high-isotropic-resolution-t2-mapping-of-the-lumbosacral-plexus-with-t2-prepared-3d-turbo-spin-echo
#12
Nico Sollmann, Dominik Weidlich, Barbara Cervantes, Elisabeth Klupp, Carl Ganter, Hendrik Kooijman, Ernst J Rummeny, Claus Zimmer, Jan S Kirschke, Dimitrios C Karampinos
PURPOSE: Isotropic high-resolution three-dimensional (3D) magnetic resonance neurography (MRN) is increasingly used to depict even small and highly oblique nerves of the lumbosacral plexus (LSP). The present study introduces a T2 mapping sequence (T2-prepared 3D turbo spin echo) that is B1-insensitive and enables quantitative assessment of LSP nerves. METHODS: In this study 15 healthy subjects (mean age 28.5 ± 3.8 years) underwent 3 T MRN of the LSP area three times...
January 10, 2018: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29319208/image-registration-to-compensate-for-epi-distortion-in-patients-with-brain-tumors-an-evaluation-of-tract-specific-effects
#13
Angela Albi, Antonio Meola, Fan Zhang, Pegah Kahali, Laura Rigolo, Chantal M W Tax, Pelin Aksit Ciris, Walid I Essayed, Prashin Unadkat, Isaiah Norton, Yogesh Rathi, Olutayo Olubiyi, Alexandra J Golby, Lauren J O'Donnell
BACKGROUND AND PURPOSE: Diffusion magnetic resonance imaging (dMRI) provides preoperative maps of neurosurgical patients' white matter tracts, but these maps suffer from echo-planar imaging (EPI) distortions caused by magnetic field inhomogeneities. In clinical neurosurgical planning, these distortions are generally not corrected and thus contribute to the uncertainty of fiber tracking. Multiple image processing pipelines have been proposed for image-registration-based EPI distortion correction in healthy subjects...
January 10, 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29318429/effect-of-intra-articular-injection-of-intermediate-weight-hyaluronic-acid-on-hip-and-knee-cartilage-in-vivo-evaluation-using-t2-mapping
#14
Giulio Ferrero, Luca Maria Sconfienza, Francesco Fiz, Emanuele Fabbro, Angelo Corazza, Daniele Dettore, Davide Orlandi, Carlo Castellazzo, Stefano Tornago, Giovanni Serafini
OBJECTIVES: We used T2 mapping to quantify the effect of intra-articular hyaluronic acid administration (IAHAA) on cartilage with correlation to clinical symptoms. METHODS: One hundred two patients with clinical and MRI diagnosis of hip or knee grade I-III chondropathy were prospectively included. All patients received a standard MRI examination of the affected hip/knee (one joint/patient) and T2-mapping multiecho sequence for cartilage evaluation. T2 values of all slices were averaged and used for analysis...
January 9, 2018: European Radiology
https://www.readbyqxmd.com/read/29315817/dynamic-measurement-of-oxygen-extraction-fraction-using-a-multiecho-asymmetric-spin-echo-mase-pulse-sequence
#15
Yayan Yin, Yaoyu Zhang, Jia-Hong Gao
PURPOSE: The oxygen extraction fraction (OEF), an important parameter for assessing brain oxygen metabolism, is a key marker of brain health. Dynamic measurement of the OEF is currently limited by the long acquisition time. In this study, a noninvasive method for rapidly and effectively assessing dynamic changes in the OEF during brain stimulation is proposed. METHODS: A novel pulse sequence using the multi-echo asymmetric spin echo with an echo-planar imaging acquisition scheme was developed to improve the temporal resolution of functional OEF measurements...
January 8, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29315714/brain-abnormalities-in-cognition-anxiety-and-depression-regulatory-regions-in-adolescents-with-single-ventricle-heart-disease
#16
Nancy A Pike, Bhaswati Roy, Ritika Gupta, Sadhana Singh, Mary A Woo, Nancy J Halnon, Alan B Lewis, Rajesh Kumar
BACKGROUND: Single ventricle heart disease (SVHD) adolescents show cognitive impairments and anxiety and depressive symptoms, indicating the possibility of brain injury in regions that control these functions. However, brain tissue integrity in cognition, anxiety, and depression regulatory sites in SVHD remains unclear. We examined brain tissue changes in SVHD compared to controls using T2-relaxometry procedures, which measure free water content and show tissue injury. METHODS: Proton-density and T2-weighted images, using a 3...
January 6, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29314235/accurate-t1-mapping-of-short-t2-tissues-using-a-three-dimensional-ultrashort-echo-time-cones-actual-flip-angle-imaging-variable-repetition-time-3d-ute-cones-afi-vtr-method
#17
Ya-Jun Ma, Xing Lu, Michael Carl, Yanchun Zhu, Nikolaus M Szeverenyi, Graeme M Bydder, Eric Y Chang, Jiang Du
PURPOSE: To develop an accurate T1 measurement method for short T2 tissues using a combination of a 3-dimensional ultrashort echo time cones actual flip angle imaging technique and a variable repetition time technique (3D UTE-Cones AFI-VTR) on a clinical 3T scanner. METHODS: First, the longitudinal magnetization mapping function of the excitation pulse was obtained with the 3D UTE-Cones AFI method, which provided information about excitation efficiency and B1 inhomogeneity...
January 3, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29301780/multiparametric-analysis-of-permeability-and-adc-histogram-metrics-for-classification-of-pediatric-brain-tumors-by-tumor-grade
#18
S Vajapeyam, D Brown, P R Johnston, K I Ricci, M W Kieran, H G W Lidov, T Y Poussaint
BACKGROUND AND PURPOSE: Accurate tumor grading is essential for treatment planning of pediatric brain tumors. We hypothesized that multiparametric analyses of a combination of permeability metrics and ADC histogram metrics would differentiate high- and low-grade tumors with high accuracy. MATERIALS AND METHODS: DTI and dynamic contrast-enhanced MR imaging using T1-mapping with flip angles of 2°, 5°, 10°, and 15°, followed by a 0.1-mmol/kg body weight gadolinium-based bolus was performed on all patients in addition to standard MR imaging...
January 4, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29298564/diffusion-tensor-imaging-of-scarring-necrosis-and-cavitation-based-on-histopathological-findings-in-dogs-with-chronic-spinal-cord-injury-evaluation-of-multiple-diffusion-parameters-and-their-correlations-with-histopathological-findings
#19
Hakyoung Yoon, Won-Jin Moon, Sang-Soep Nahm, Jaehwan Kim, Kidong Eom
The use of diffusion tensor imaging (DTI) for the characterization of various lesion types in dogs with spinal cord injury (SCI) has not been investigated. The purpose of this study was to characterize scarring [loose immature scarring (LIMS), intermediate mature scarring (IMS), and dense mature scarring (DMS)], necrosis, cavitation, and acute hemorrhage using multiple DTI parameters and determine the correlations between the DTI parameters and histopathological finding in dogs with controlled SCI. All imaging data were obtained from the lumbar spinal cord (from L1 to L3) of normal and SCI dogs using a 3-Tesla magnetic resonance imaging scanner...
January 3, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29296631/features-of-mri-stromal-enhancement-with-neoadjuvant-chemotherapy-a-subgroup-analysis-of-the-acrin-6657-i-spy-trial
#20
Adam Olshen, Denise Wolf, Ella F Jones, David Newitt, Laura van 't Veer, Christina Yau, Laura Esserman, Julia D Wulfkuhle, Rosa I Gallagher, Lisa Singer, Emanuel F Petricoin, Nola Hylton, Catherine C Park
Although the role of cancer-activated stroma in malignant progression has been well investigated, the influence of an activated stroma in therapy response is not well understood. Using retrospective pilot cohorts, we previously observed that MRI detected stromal contrast enhancement was associated with proximity to the tumor and was predictive for relapse-free survival in patients with breast cancer receiving neoadjuvant chemotherapy. Here, to evaluate the association of stromal contrast enhancement to therapy, we applied an advanced tissue mapping technique to evaluate stromal enhancement patterns within 71 patients enrolled in the I-SPY 1 neoadjuvant breast cancer trial...
January 2018: Journal of Medical Imaging
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"