keyword
MENU ▼
Read by QxMD icon Read
search

T1 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/29352231/the-direction-of-tumour-growth-in-glioblastoma-patients
#2
Morteza Esmaeili, Anne Line Stensjøen, Erik Magnus Berntsen, Ole Solheim, Ingerid Reinertsen
Generating MR-derived growth pattern models for glioblastoma multiforme (GBM) has been an attractive approach in neuro-oncology, suggesting a distinct pattern of lesion spread with a tendency in growing along the white matter (WM) fibre direction for the invasive component. However, the direction of growth is not much studied in vivo. In this study, we sought to study the dominant directions of tumour expansion/shrinkage pre-treatment. We examined fifty-six GBMs at two time-points: at radiological diagnosis and as part of the pre-operative planning, both with contrast-enhanced T1-weighted MRIs...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29344721/post-mortem-mr-angiography-quantitative-investigation-and-intravascular-retention-of-perfusates-in-ex-situ-porcine-hearts
#3
Bridgette Webb, Thomas Widek, Sylvia Scheicher, Thorsten Schwark, Rudolf Stollberger
As the implementation of minimally invasive imaging techniques in both forensic and pathological practice increases, research in this area focuses on addressing recognised diagnostic weaknesses of current approaches. Assessment of sudden cardiac death (SCD) can be considered one such area in which post-mortem imaging still shows diagnostic weaknesses. We hypothesise that magnetic resonance imaging (MRI) with an angiographic adjunct may improve the visualisation and interpretation of cardiac pathologies in a post-mortem setting...
January 18, 2018: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29343710/phenotypic-diversity-identified-by-cardiac-magnetic-resonance-in-a-large-hypertrophic-cardiomyopathy-family-with-a-single-myh7-mutation
#4
Jie Wang, Ke Wan, Jiayu Sun, Weihao Li, Hong Liu, Yuchi Han, Yucheng Chen
Limited data is available on phenotypic variations with the same genotype in hypertrophic cardiomyopathy (HCM). The present study aims to explore the relationship between genotype and phenotype characterized by cardiovascular magnetic resonance (CMR) in a large Chinese family. A proband diagnosed with HCM from a multigenerational family underwent next-generation sequencing based on a custom sureSelect panel, including 117 candidate pathogenic genes associated with cardiomyopathies. All genetic results were confirmed by the Sanger sequencing method...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343659/cardiac-mr-imaging-of-hypertrophic-cardiomyopathy-techniques-findings-and-clinical-relevance
#5
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/29343657/combining-segmented-grey-and-white-matter-images-improves-voxel-based-morphometry-for-the-case-of-dilated-lateral-ventricles
#6
Masami Goto, Osamu Abe, Shigeki Aoki, Koji Kamagata, Masaaki Hori, Tosiaki Miyati, Tsutomu Gomi, Tohoru Takeda
PURPOSE: To evaluate the error in segmented tissue images and to show the usefulness of the brain image in voxel-based morphometry (VBM) using Statistical Parametric Mapping (SPM) 12 software and 3D T1-weighted magnetic resonance images (3D-T1WIs) processed to simulate idiopathic normal pressure hydrocephalus (iNPH). MATERIALS AND METHODS: VBM analysis was performed on sagittal 3D-T1WIs obtained in 22 healthy volunteers using a 1.5T MR scanner. Regions of interest for the lateral ventricles of all subjects were carefully outlined on the original 3D-T1WIs, and two types of simulated 3D-T1WI were also prepared (non-dilated 3D-T1WI as normal control and dilated 3D-T1WI to simulate iNPH)...
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
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/29336598/quantitative-mr-evaluation-of-chronic-pancreatitis-extracellular-volume-fraction-and-mr-relaxometry
#8
Temel Tirkes, Chen Lin, Enming Cui, Yu Deng, Paul R Territo, Kumaresan Sandrasegaran, Fatih Akisik
OBJECTIVE: The purpose of this study was to determine if extracellular volume fraction and T1 mapping can be used to diagnose chronic pancreatitis (CP). MATERIALS AND METHODS: This HIPAA-compliant study analyzed 143 consecutive patients with and without CP who underwent MR imaging between May 2016 and February 2017. Patients were selected for the study according to inclusion and exclusion criteria that considered history and clinical and laboratory findings. Eligible patients (n = 119) were grouped as normal (n = 60) or with mild (n = 22), moderate (n = 27), or severe (n = 10) CP on the basis of MRCP findings using the Cambridge classification as the reference standard...
January 16, 2018: AJR. American Journal of Roentgenology
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/29328539/early-detection-of-myocardial-involvement-by-t1-mapping-of-cardiac-mri-in-idiopathic-inflammatory-myopathy
#10
Liuyu Yu, Jianhong Sun, Jiayu Sun, Jiangbo Li, Yang Dong, Xiaoyue Zhou, Andreas Greiser, Yuchi Han, Qing Zhang, Qibing Xie, Yucheng Chen
BACKGROUND: Polymyositis (PM) and dermatomyositis (DM) are common types of idiopathic inflammatory myopathy (IIM), wherein patients are prone to adverse cardiovascular events. PURPOSE: To explore the value of cardiac magnetic resonance imaging (MRI) for detecting cardiac involvement in PM/DM patients using a T1 mapping technique. STUDY TYPE: Prospective observational study. POPULATION: In all, 25 PM/DM patients free of cardiovascular symptoms and preserved ventricular systolic function and 25 healthy volunteers matched for age and sex served as controls...
January 12, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29325780/longitudinal-atlas-for-normative-human-brain-development-and-aging-over-the-lifespan-using-quantitative-susceptibility-mapping
#11
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/29323247/leakage-correction-improves-prognosis-prediction-of-dynamic-susceptibility-contrast-perfusion-mri-in-primary-central-nervous-system-lymphoma
#12
Yeon Soo Kim, Seung Hong Choi, Roh-Eul Yoo, Koung Mi Kang, Tae Jin Yun, Ji-Hoon Kim, Chul-Ho Sohn, Sung-Hye Park, Jae-Kyung Won, Tae Min Kim, Chul-Kee Park, Il Han Kim
To evaluate whether the cerebral blood volume (CBV) measurement with leakage correction from dynamic susceptibility contrast perfusion weighted imaging can be useful in predicting prognosis for primary central nervous system lymphoma (PCNSL). 46 PCNSL patients were included and classified by radiation therapy (RT) stratification into RT (n = 30) and non-RT (n = 16) groups. The corresponding histogram parameters of normalized CBV (nCBV) maps with or without leakage correction were calculated on contrast-enhanced T1 weighted image (CE T1WI) or on fluid attenuated inversion recovery image...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29322264/cerebral-gray-matter-volume-in-patients-with-chronic-migraine-correlations-with-clinical-features
#13
Gianluca Coppola, Barbara Petolicchio, Antonio Di Renzo, Emanuele Tinelli, Cherubino Di Lorenzo, Vincenzo Parisi, Mariano Serrao, Valentina Calistri, Stefano Tardioli, Gaia Cartocci, Anna Ambrosini, Francesca Caramia, Vittorio Di Piero, Francesco Pierelli
BACKGROUND: To date, few MRI studies have been performed in patients affected by chronic migraine (CM), especially in those without medication overuse. Here, we performed magnetic resonance imaging (MRI) voxel-based morphometry (VBM) analyses to investigate the gray matter (GM) volume of the whole brain in patients affected by CM. Our aim was to investigate whether fluctuations in the GM volumes were related to the clinical features of CM. METHODS: Twenty untreated patients with CM without a past medical history of medication overuse underwent 3-Tesla MRI scans and were compared to a group of 20 healthy controls (HCs)...
December 8, 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/29321323/hiv-1-vif-s-capacity-to-manipulate-the-cell-cycle-is-species-specific
#14
Edward L Evans, Jordan T Becker, Stephanie L Fricke, Kishan Patel, Nathan M Sherer
Cells derived from mice and other rodents exhibit profound blocks to HIV-1 virion production reflecting species-specific incompatibilities between viral Tat and Rev proteins and essential host factors Cyclin T1 (CCNT1) and Exportin-1 (XPO1, also known as CRM1), respectively. To determine if mouse cell blocks other than CCNT1 and XPO1 affect HIV's post-integration stages, we studied HIV-1NL4-3 gene expression in mouse NIH 3T3 cells modified to constitutively express HIV-1 compatible versions of CCNT1 and XPO1 (3T3...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29320888/comparative-studies-with-epr-and-mri-on-the-in-vivo-tissue-redox-status-estimation-using-redox-sensitive-nitroxyl-probes-influence-of-the-choice-of-the-region-of-interest
#15
Ken-Ichiro Matsumoto, James B Mitchell, Murali C Krishna
In vivo decay rates of a nitroxyl contrast agent were estimated by a MR redox imaging (MRRI) technique and compared with the decay rates obtained by the electron paramagnetic resonance spectroscopy (EPRS) and imaging (EPRI). MRRI is a dynamic imaging technique employing T1-weighted pulse sequence, which can visualize a nitroxyl-induced enhancement of signal intensity by T1-weighted contrast. EPR techniques can directly measure the paramagnetic nitroxyl radical. Both the squamous cell carcinoma (SCC) tumor-bearing and normal legs of a female C3H mouse were scanned by T1-weighted SPGR sequence at 4...
January 10, 2018: Free Radical Research
https://www.readbyqxmd.com/read/29316081/alterations-of-the-cerebellum-and-basal-ganglia-in-bipolar-disorder-mood-states-detected-by-quantitative-t1%C3%AF-mapping
#16
Casey P Johnson, Gary E Christensen, Jess G Fiedorowicz, Merry Mani, Joseph J Shaffer, Vincent A Magnotta, John A Wemmie
OBJECTIVES: Quantitative mapping of T1 relaxation in the rotating frame (T1ρ) is a magnetic resonance imaging technique sensitive to pH and other cellular and microstructural factors, and is a potentially valuable tool for identifying brain alterations in bipolar disorder. Recently, this technique identified differences in the cerebellum and cerebral white matter of euthymic patients vs healthy controls that were consistent with reduced pH in these regions, suggesting an underlying metabolic abnormality...
January 7, 2018: Bipolar Disorders
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/29314198/nonrigid-active-shape-model-based-registration-framework-for-motion-correction-of-cardiac-t1-mapping
#18
Hossam El-Rewaidy, Maryam Nezafat, Jihye Jang, Shiro Nakamori, Ahmed S Fahmy, Reza Nezafat
PURPOSE: Accurate reconstruction of myocardial T1 maps from a series of T1 -weighted images consists of cardiac motions induced from breathing and diaphragmatic drifts. We propose and evaluate a new framework based on active shape models to correct for motion in myocardial T1 maps. METHODS: Multiple appearance models were built at different inversion time intervals to model the blood-myocardium contrast and brightness changes during the longitudinal relaxation. Myocardial inner and outer borders were automatically segmented using the built models, and the extracted contours were used to register the T1 -weighted images...
January 3, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29313039/photodissociation-dynamics-of-acetone-studied-by-time-resolved-ion-imaging-and-photofragment-excitation-spectroscopy
#19
Benjamin W Toulson, Dmitry A Fishman, Craig Murray
The photodissociation dynamics of acetone has been investigated using velocity-map ion imaging and photofragment excitation (PHOFEX) spectroscopy across a range of wavelengths spanning the first absorption band (236-308 nm). The radical products of the Norrish Type I dissociation, methyl and acetyl, as well as the molecular product ketene have been detected by single-photon VUV ionization at 118 nm. Ketene appears to be formed with non-negligible yield at all wavelengths, with a maximum value of Φ ≈ 0.3 at 280 nm...
January 9, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29305739/quantitative-inversion-time-prescription-for-myocardial-late-gadolinium-enhancement-using-t1-mapping-based-synthetic-inversion-recovery-imaging-reducing-subjectivity-in-the-estimation-of-inversion-time
#20
Sebastian Gassenmaier, Rob J van der Geest, U Joseph Schoepf, Pal Suranyi, Wolfgang G Rehwald, Carlo N De Cecco, Domenico Mastrodicasa, Moritz H Albrecht, Domenico De Santis, Virginia W Lesslie, Balazs Ruzsics, Akos Varga-Szemes
To develop a quantitative T1-mapping-based synthetic inversion recovery (IRsynth) approach to calculate the optimal inversion time (TI0) for late gadolinium enhancement (LGE) imaging. Prospectively enrolled patients (n = 130, 58 ± 16 years) underwent cardiac MRI on a 1.5T system including Look-Locker TI-scout (LL), modified LL IR (MOLLI)-based T1-mapping, and LGE acquisitions. Patients were randomized into two groups: LL group (TI-scout followed T1-mapping) or MOLLI group (T1-mapping followed TI-scout)...
January 5, 2018: International Journal of Cardiovascular Imaging
keyword
keyword
82906
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"