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https://www.readbyqxmd.com/read/28092848/the-initial-use-of-arterial-spin-labeling-perfusion-and-diffusion-weighted-magnetic-resonance-images-in-the-diagnosis-of-nonconvulsive-partial-status-epileptics
#1
Takafumi Shimogawa, Takato Morioka, Tetsuro Sayama, Sei Haga, Yuka Kanazawa, Kei Murao, Shuji Arakawa, Ayumi Sakata, Koji Iihara
BACKGROUND: In the diagnosis of nonconvulsive status epilepticus (NCSE), capture of ongoing ictal electroencephalographic (EEG) findings is the gold standard; however, this is practically difficult without continuous EEG monitoring facilities. Magnetic resonance imaging (MRI), including diffusion-weighted imaging (DWI) and perfusion MRI with arterial spin labeling (ASL), have been applied mainly in emergency situations. Recent reports have described that ictal MRI findings, including ictal hyperperfusion on ASL and cortical hyperintensity of cytotoxic edema on DWI, can be obtained from epileptically activated cortex...
December 21, 2016: Epilepsy Research
https://www.readbyqxmd.com/read/28092638/mr-elastography-to-measure-the-effects-of-cancer-and-pathology-fixation-on-prostate-biomechanics-and-comparison-with-t-1-t-2-and-adc
#2
Deirdre M McGrath, Jenny Lee, Warren D Foltz, Navid Samavati, Theo van der Kwast, Michael A S Jewett, Peter Chung, Cynthia Ménard, Kristy K Brock
MRI is under evaluation for image-guided intervention for prostate cancer. The sensitivity and specificity of MRI parameters is determined via correlation with the gold-standard of histopathology. Whole-mount histopathology of prostatectomy specimens can be digitally registered to in vivo imaging for correlation. When biomechanical-based deformable registration is employed to account for deformation during histopathology processing, the ex vivo biomechanical properties are required. However, these properties are altered by pathology fixation, and vary with disease...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28092543/a-robust-wrap-reduction-algorithm-for-fringe-projection-profilometry-and-applications-in-magnetic-resonance-imaging
#3
Miguel Arevalillo-Herraez, Maximo Cobos, Miguel Garcia Pineda
In this paper, we present an effective algorithm to reduce the number of wraps in a two-dimensional (2-D) phase signal provided as input. The technique is based on an accurate estimate of the fundamental frequency of a 2-D complex signal with the phase given by the input, and the removal of a dependent additive term from the phase map. Unlike existing methods based on the Discrete Fourier Transform (DFT), the frequency is computed by using noise-robust estimates that are not restricted to integer values. Then, to deal with the problem of a non-integer shift in the frequency domain, an equivalent operation is carried out on the original phase signal...
January 10, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28092528/low-rank-and-adaptive-sparse-signal-lassi-models-for-highly-accelerated-dynamic-imaging
#4
Saiprasad Ravishankar, Brian Moore, Raj Nadakuditi, Jeffrey Fessler
Sparsity-based approaches have been popular in many applications in image processing and imaging. Compressed sensing exploits the sparsity of images in a transform domain or dictionary to improve image recovery from undersampled measurements. In the context of inverse problems in dynamic imaging, recent research has demonstrated the promise of sparsity and low-rank techniques. For example, the patches of the underlying data are modeled as sparse in an adaptive dictionary domain, and the resulting image and dictionary estimation from undersampled measurements is called dictionary-blind compressed sensing, or the dynamic image sequence is modeled as a sum of low-rank and sparse (in some transform domain) components (L+S model) that are estimated from limited measurements...
January 10, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28092495/nonhypervascular-pancreatic-neuroendocrine-tumors-differential-diagnosis-from-pancreatic-ductal-adenocarcinomas-at-mr-imaging-retrospective-cross-sectional-study
#5
Sun Kyung Jeon, Jeong Min Lee, Ijin Joo, Eun Sun Lee, Hyun Jeong Park, Jin-Young Jang, Ji Kon Ryu, Kyung Bun Lee, Joon Koo Han
Purpose To determine useful magnetic resonance (MR) imaging features to differentiate nonhypervascular pancreatic neuroendocrine tumors (PNETs) from pancreatic ductal adenocarcinomas (PDACs). Materials and Methods The institutional review board approved this retrospective study and waived the informed consent requirement. Seventy-four patients with surgically confirmed PNETs and 82 patients with PDACs who underwent gadobutrol-enhanced MR imaging were included. Two radiologists independently evaluated the morphologic characteristics and temporal enhancement patterns of each tumor...
January 13, 2017: Radiology
https://www.readbyqxmd.com/read/28092414/dce-mri-of-the-prostate-using-shutter-speed-vs-tofts-model-for-tumor-characterization-and-assessment-of-aggressiveness
#6
Stefanie J Hectors, Cecilia Besa, Mathilde Wagner, Guido H Jajamovich, George K Haines, Sara Lewis, Ashutosh Tewari, Ardeshir Rastinehad, Wei Huang, Bachir Taouli
PURPOSE: To quantify Tofts model (TM) and shutter-speed model (SSM) perfusion parameters in prostate cancer (PCa) and noncancerous peripheral zone (PZ) and to compare the diagnostic performance of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) to Prostate Imaging and Reporting and Data System (PI-RADS) classification for the assessment of PCa aggressiveness. MATERIALS AND METHODS: Fifty PCa patients (mean age 60 years old) who underwent MRI at 3...
January 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28092411/measurement-of-arterial-transit-time-and-renal-blood-flow-using-pseudocontinuous-asl-mri-with-multiple-post-labeling-delays-feasibility-reproducibility-and-variation
#7
Dong Won Kim, Woo Hyun Shim, Seong Kuk Yoon, Jong Yeong Oh, Jeong Kon Kim, Hoesu Jung, Tsuyoshi Matsuda, Dongeun Kim
PURPOSE: To evaluate the feasibility, reproducibility, and variation of renal perfusion and arterial transit time (ATT) using pseudocontinuous arterial spin labeling magnetic resonance imaging (PCASL MRI) in healthy volunteers. MATERIALS AND METHODS: PCASL MRI at 3T was performed in 25 healthy volunteers on two different occasions. The ATT and ATT-corrected renal blood flow (ATT-cRBF) were calculated at four different post-labeling delay points (0.5, 1.0, 1.5, and 2...
January 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28092330/prediction-of-anastomotic-leakage-after-laparoscopic-low-anterior-resection-in-male-rectal-cancer-by-pelvic-measurement-in-magnetic-resonance-imaging
#8
Atsushi Tsuruta, Jo Tashiro, Toshimasa Ishii, Yasuo Oka, Asami Suzuki, Hiroka Kondo, Shigeki Yamaguchi
OBJECTIVE: Anastomotic leakage after laparoscopic low anterior resection in male rectal cancer patients with a narrow pelvis cannot be easily resolved. The objective of this study is to assess numerical information of narrow pelvis and to determine whether prediction of morbidity can be possible. METHODS: Retrospective medical record review was performed. From July 2007 to January 2013, 43 consecutive male patients with low rectal cancer who underwent laparoscopic low anterior resection were divided into the anastomotic leakage-negative group and anastomotic leakage-positive group...
January 13, 2017: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
https://www.readbyqxmd.com/read/28092321/dexmedetomidine-disrupts-the-local-and-global-efficiencies-of-large-scale-brain-networks
#9
Javeria A Hashmi, Marco L Loggia, Sheraz Khan, Lei Gao, Jieun Kim, Vitaly Napadow, Emery N Brown, Oluwaseun Akeju
BACKGROUND: A clear understanding of the neural basis of consciousness is fundamental to research in clinical and basic neuroscience disciplines and anesthesia. Recently, decreased efficiency of information integration was suggested as a core network feature of propofol-induced unconsciousness. However, it is unclear whether this finding can be generalized to dexmedetomidine, which has a different molecular target. METHODS: Dexmedetomidine was administered as a 1-μg/kg bolus over 10 min, followed by a 0...
January 16, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28092291/diagnosing-myocarditis-with-magnetic-resonance
#10
Chiara Bucciarelli-Ducci
No abstract text is available yet for this article.
January 13, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28092290/clinical-recommendations-of-cardiac-magnetic-resonance-part-ii-inflammatory-and-congenital-heart-disease-cardiomyopathies-and-cardiac-tumors-a-position-paper-of-the-working-group-applicazioni-della-risonanza-magnetica-of-the-italian-society-of-cardiology
#11
Gianluca Pontone, Gianluca Di Bella, Castelletti Silvia, Viviana Maestrini, Pierluigi Festa, Lamia Ait-Ali, Pier Giorgio Masci, Lorenzo Monti, Gabriella di Giovine, Manuel De Lazzari, Alberto Cipriani, Andrea I Guaricci, Santo Dellegrottaglie, Alessia Pepe, Martina Perazzolo Marra, Giovanni Donato Aquaro
The current document was developed by the working group on the 'application of cardiac magnetic resonance' of the Italian Society of Cardiology to provide a perspective on the current state of technical advances and clinical cardiac magnetic resonance applications and to inform cardiologists how to implement their clinical and diagnostic pathway with the introduction of this technique in the clinical practice. Appropriateness criteria were defined using a score system: score 1-3 = inappropriate (test is not generally acceptable and is not a reasonable approach for the indication), score 4-6 = uncertain (test may be generally acceptable and may be a reasonable approach for the indication but more research and/or patient information is needed to classify the indication definitively) and score 7-9 = appropriate (test is generally acceptable and is a reasonable approach for the indication)...
January 13, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28092272/material-dependent-implant-artifact-reduction-using-semac-vat-and-mavric-a-prospective-mri-phantom-study
#12
Lukas Filli, Lukas Jud, Roger Luechinger, Daniel Nanz, Gustav Andreisek, Val M Runge, Sebastian Kozerke, Nadja A Farshad-Amacker
OBJECTIVE: The aim of this study was to compare the degree of artifact reduction in magnetic resonance imaging achieved with slice encoding for metal artifact correction (SEMAC) in combination with view angle tilting (VAT) and multiacquisition variable resonance image combination (MAVRIC) for standard contrast weightings and different metallic materials. METHODS: Four identically shaped rods made of the most commonly used prosthetic materials (stainless steel, SS; titanium, Ti; cobalt-chromium-molybdenum, CoCr; and oxidized zirconium, oxZi) were scanned at 3 T...
January 13, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28092203/machine-learning-of-three-dimensional-right-ventricular-motion-enables-outcome-prediction-in-pulmonary-hypertension-a-cardiac-mr-imaging-study
#13
Timothy J W Dawes, Antonio de Marvao, Wenzhe Shi, Tristan Fletcher, Geoffrey M J Watson, John Wharton, Christopher J Rhodes, Luke S G E Howard, J Simon R Gibbs, Daniel Rueckert, Stuart A Cook, Martin R Wilkins, Declan P O'Regan
Purpose To determine if patient survival and mechanisms of right ventricular failure in pulmonary hypertension could be predicted by using supervised machine learning of three-dimensional patterns of systolic cardiac motion. Materials and Methods The study was approved by a research ethics committee, and participants gave written informed consent. Two hundred fifty-six patients (143 women; mean age ± standard deviation, 63 years ± 17) with newly diagnosed pulmonary hypertension underwent cardiac magnetic resonance (MR) imaging, right-sided heart catheterization, and 6-minute walk testing with a median follow-up of 4...
January 16, 2017: Radiology
https://www.readbyqxmd.com/read/28092068/differential-diagnosis-of-pituitary-masses-at-magnetic-resonance-imaging
#14
EDITORIAL
Salvatore Maria Corsello, Rosa Maria Paragliola
No abstract text is available yet for this article.
January 16, 2017: Endocrine
https://www.readbyqxmd.com/read/28092038/nmr-chemical-shift-mapping-of-sh2-peptide-interactions
#15
Marissa A McKercher, Deborah S Wuttke
Heteronuclear single quantum coherence (HSQC) nuclear magnetic resonance (NMR) experiments offer a rapid and high resolution approach to gaining binding and conformational insights into a protein-peptide interaction. By tracking (1)H and (15)N chemical shift changes over the course of a peptide titration into isotopically labeled protein, amide NH pairs of amino acids whose chemical environment changes upon peptide binding can be identified. When mapped onto a structure of the protein, this approach can identify the peptide-binding interface or regions undergoing conformation changes within a protein upon ligand binding...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28092037/structural-characterization-of-monomeric-dimeric-state-of-p59-fyn-sh2-domain
#16
Radu Huculeci, Fabien Kieken, Abel Garcia-Pino, Lieven Buts, Nico van Nuland, Tom Lenaerts
Src homology 2 (SH2) domains are key modulators in various signaling pathways allowing the recognition of phosphotyrosine sites of different proteins. Despite the fact that SH2 domains acquire their biological functions in a monomeric state, a multitude of reports have shown their tendency to dimerize. Here, we provide a technical description on how to isolate and characterize by gel filtration, circular dichroism (CD), and nuclear magnetic resonance (NMR) each conformational state of p59(fyn) SH2 domain.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28092022/relevance-of-neuroimaging-for-neurocognitive-and-behavioral-outcome-after-pediatric-traumatic-brain-injury
#17
Marsh Königs, Petra Jw Pouwels, L W Ernest van Heurn, Roel Bakx, R Jeroen Vermeulen, J Carel Goslings, Bwee Tien Poll-The, Marleen van der Wees, Coriene E Catsman-Berrevoets, Jaap Oosterlaan
This study aims to (1) investigate the neuropathology of mild to severe pediatric TBI and (2) elucidate the predictive value of conventional and innovative neuroimaging for functional outcome. Children aged 8-14 years with trauma control (TC) injury (n = 27) were compared to children with mild TBI and risk factors for complicated TBI (mild(RF+), n = 20) or moderate/severe TBI (n = 17) at 2.8 years post-injury. Neuroimaging measures included: acute computed tomography (CT), volumetric analysis on post-acute conventional T1-weighted magnetic resonance imaging (MRI) and post-acute diffusion tensor imaging (DTI, analyzed using tract-based spatial statistics and voxel-wise regression)...
January 14, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28091836/assessment-of-edema-using-stir-via-3d-cardiovascular-magnetic-resonance-imaging-in-patients-with-suspected-myocarditis
#18
Michael Jeserich, Bela Merkely, Pascal Schlosser, Simone Kimmel, Gabor Pavlik, Stephan Achenbach
OBJECTIVE: To evaluate three-dimensional T2-weighted fast spin echo triple inversion recovery sequences (STIR+) for the diagnosis of myocardial edema in patients with suspected early myocarditis after respiratory or gastrointestinal tract viral infection and at follow-up. MATERIALS AND METHODS: We prospectively examined 28 patients with suspected myocarditis and 37 controls matched for gender and age. An ECG-triggered STIR+ was used to cover the entire left ventricle in short-axis images with 10-mm slice thickness and no interslice gap...
January 16, 2017: Magma
https://www.readbyqxmd.com/read/28091817/teratomas-of-the-cranial-vault-a-systematic-analysis-of-clinical-outcomes-stratified-by-histopathological-subtypes
#19
Carlito Lagman, Timothy T Bui, Brittany L Voth, Lawrance K Chung, David J Seo, Courtney Duong, Mark R Libowitz, Naomi E Walker, Daniel T Nagasawa, Isaac Yang
BACKGROUND: Teratomas of the cranial vault are divided into histopathological subtypes and grouped by prognoses: mature (good prognosis), mixed/malignant and immature teratomas (intermediate prognosis). This schema also includes non-teratomatous tumors. The authors of this study sought to elucidate histologically dependent predictors of survival and further clarify the classification system of intracranial teratomas. METHODS: We performed a systematic analysis of the published literature to identify studies describing patients with intracranial teratomas diagnosed with magnetic resonance imaging (MRI) and presenting definite information on histologies, therapies, and outcomes at a minimum follow-up of 2 years...
January 14, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28091734/level-of-conus-medullaris-termination-in-adult-population-analyzed-by-kinetic-magnetic-resonance-imaging
#20
An Liu, Kaixiang Yang, Daling Wang, Changqing Li, Zhiwei Ren, Shigui Yan, Zorica Buser, Jeffrey C Wang
PURPOSE: To investigate the change of conus medullaris termination (CMT) level in neutral, flexion and extension positions and to analyze the effects of age and gender on the CMT level. METHODS: The midline sagittal T2-weighted kinetic magnetic resonance imaging (kMRI) study of 585 patients was retrospectively reviewed to identify the level of CMT. All patients were in an upright position. A straight line perpendicular to the long axis of the cord was drawn from the tip of the cord and then subtended to the adjacent vertebra or disk space...
January 16, 2017: Surgical and Radiologic Anatomy: SRA
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