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https://www.readbyqxmd.com/read/29441423/how-do-mri-detected-subchondral-bone-marrow-lesions-bmls-on-two-different-mri-sequences-correlate-with-clinically-important-outcomes
#1
Siti Maisarah Mattap, Dawn Aitken, Karen Wills, Laura Laslett, Changhai Ding, Jean-Pierre Pelletier, Johanne Martel-Pelletier, Stephen E Graves, Michelle Lorimer, Flavia Cicuttini, Graeme Jones
The aim of this study is to describe the association of bone marrow lesions (BMLs) present on two different MRI sequences with clinical outcomes, cartilage defect progression, cartilage volume loss over 2.7 years, and total knee replacement (TKR) over 13.3 years. 394 participants (50-80 years) were assessed at baseline and 2.7 years. BML presence at baseline was scored on T1-weighted fat-suppressed 3D gradient-recalled acquisition (T1) and T2-weighted fat-suppressed 2D fast spin-echo (T2) sequences. Knee pain, function, and stiffness were assessed using WOMAC...
February 13, 2018: Calcified Tissue International
https://www.readbyqxmd.com/read/29427405/robust-sense-reconstruction-of-simultaneous-multislice-epi-with-low-rank-enhanced-coil-sensitivity-calibration-and-slice-dependent-2d-nyquist-ghost-correction
#2
Mengye Lyu, Markus Barth, Victor B Xie, Yilong Liu, Xin Ma, Yanqiu Feng, Ed X Wu
PURPOSE: To improve simultaneous multislice (SMS) EPI by robust Nyquist ghost correction in both coil sensitivity calibration and SMS reconstruction. METHODS: To derive coil sensitivity and slice-dependent phase difference map between positive- and negative-echo images, single-band EPI reference data are fully sampled with EPI parameters matched to SMS acquisition. First, the reference data are organized into positive- and negative-echo virtual channels where missing data are estimated using low-rank-based simultaneous autocalibrating and k-space estimation (SAKE) at small matrix size...
February 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29427393/dynamic-2d-self-phase-map-nyquist-ghost-correction-for-simultaneous-multi-slice-echo-planar-imaging
#3
Uten Yarach, Yi-Hang Tung, Kawin Setsompop, Myung-Ho In, Itthi Chatnuntawech, Renat Yakupov, Frank Godenschweger, Oliver Speck
PURPOSE: To develop a reconstruction pipeline that intrinsically accounts for both simultaneous multislice echo planar imaging (SMS-EPI) reconstruction and dynamic slice-specific Nyquist ghosting correction in time-series data. METHODS: After 1D slice-group average phase correction, the separate polarity (i.e., even and odd echoes) SMS-EPI data were unaliased by slice GeneRalized Autocalibrating Partial Parallel Acquisition. Both the slice-unaliased even and odd echoes were jointly reconstructed using a model-based framework, extended for SMS-EPI reconstruction that estimates a 2D self-phase map, corrects dynamic slice-specific phase errors, and combines data from all coils and echoes to obtain the final images...
February 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29402657/nonalcoholic-fatty-liver-disease-in-patients-with-type-2-diabetes-mellitus-and-its-association-with-cardiovascular-disease
#4
Sivabal Vanjiappan, Abdoul Hamide, Ramesh Ananthakrishnan, Senthilkumar Gandhipuram Periyasamy, Vadivelan Mehalingam
INTRODUCTION: Non-alcoholic fatty liver disease (NAFLD) encompasses a wide spectrum of liver disease that ranges from hepatic steatosis to non-alcoholic steatohepatitis. Obesity and diabetes mellitus are the prime risk factors for NAFLD. The aim of this study was to find out the prevalence of NAFLD among patients with type 2 diabetes mellitus and to detect the association of NAFLD with cardiovascular disease in them. STUDY DESIGN: Prospective observational study...
January 31, 2018: Diabetes & Metabolic Syndrome
https://www.readbyqxmd.com/read/29399013/the-clinical-value-of-prenatal-3d-ultrasonic-diagnosis-on-fetus-hemivertebra-deformity-a-preliminary-study
#5
Yanting Wen, Guishuang Xiang, Xiaoqiu Liang, Xiaoqian Tong
Objective: The present study is planned to discuss the clinical value of prenatal 3D ultra-sonic diagnosis on fetus hemivertebra deformity through the retrospective analysis of clinical data of fetus hemivertebra deformity. Methods: Selected 9 fetus hemivertebra deformity cases, which have been admitted to our hospital during the period from January, 2010 to January, 2016 as study samples, and analyzed their 2D and 3D ultrasonic examination data. Results: 4 cases of the fetus hemivertebra deformity occurred at lumbar vertebra, 3 cases at thoracic vertebra, and 2 cases at thoracolumbar vertebra...
February 2018: Current Medical Imaging Reviews
https://www.readbyqxmd.com/read/29398137/prognostic-impact-of-leaflet-to-annulus-index-in-patients-treated-with-transapical-off-pump-echo-guided-mitral-valve-repair-with-neochord-implantation
#6
Andrea Colli, Laura Besola, Matteo Montagner, Danila Azzolina, Nicola Soriani, Erica Manzan, Eleonora Bizzotto, Fabio Zucchetta, Roberto Bellu, Demetrio Pittarello, Gino Gerosa
BACKGROUND: The transapical echo-guided NeoChord repair is a procedure to correct mitral regurgitation (MR) without the need for concomitant annuloplasty for degenerative mitral valve (MV) disease. Lacking strict criteria to define normal annular dimensions for patients undergoing MV repair, we consequently missed having precise selection criteria to identify patients who can benefit from a ringless procedure with respect to who would need a combined annular and leaflet repair. The aim of this study is to identify whether a new preoperative echocardiographic index may predict postoperative outcomes after NeoChord repair...
January 31, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29396694/feasibility-of-using-an-inversion-recovery-ultrashort-echo-time-ute-sequence-for-quantification-of-glenoid-bone-loss
#7
Ya-Jun Ma, Justin West, Amin Nazaran, Xin Cheng, Heinz Hoenecke, Jiang Du, Eric Y Chang
OBJECTIVE: To utilize the 3D inversion recovery prepared ultrashort echo time with cones readout (IR-UTE-Cones) MRI technique for direct imaging of lamellar bone with comparison to the gold standard of computed tomography (CT). MATERIALS AND METHODS: CT and MRI was performed on 11 shoulder specimens and three patients. Five specimens had imaging performed before and after glenoid fracture (osteotomy). 2D and 3D volume-rendered CT images were reconstructed and conventional T1-weighted and 3D IR-UTE-Cones MRI techniques were performed...
February 2, 2018: Skeletal Radiology
https://www.readbyqxmd.com/read/29390418/evaluation-of-carotid-arterial-elasticity-in-patients-with-obstructive-sleep-apnea-hypopnea-syndrome-by-two-dimensional-speckle-tracking-imaging
#8
Manjie You, Li Zhang, Lingyun Fang, Jie Li, Mingxing Xie
The objective is to evaluate carotid arterial elasticity in patients with obstructive sleep apnea hypopnea syndrome (OSAHS) by two-dimensional speckle tracking imaging (2D-STI).Sixty-two hospitalized patients with OSAHS and 20 healthy subjects were studied. The OSAHS patients were divided into 3 subgroups: a mild group, a moderate group, and severe group. All subjects underwent complete left common carotid artery (LCCA) examination by echo-tacking technique and 2D-STI. The stiffness parameter (β), elastic modulus (Eρ), stiffness β single pulse wave velocity (PWVβ), and arterial compliance (AC) were automatically calculated by echo-tracking technique...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29388254/wave-caipi-vista-highly-accelerated-whole-brain-direct-myelin-water-imaging-with-zero-padding-reconstruction
#9
Zhe Wu, Berkin Bilgic, Hongjian He, Qiqi Tong, Yi Sun, Yiping Du, Kawin Setsompop, Jianhui Zhong
PURPOSE: This study introduces a highly accelerated whole-brain direct visualization of short transverse relaxation time component (ViSTa) imaging using a wave controlled aliasing in parallel imaging (CAIPI) technique, for acquisition within a clinically acceptable scan time, with the preservation of high image quality and sufficient spatial resolution, and reduced residual point spread function artifacts. METHODS: Double inversion RF pulses were applied to preserve the signal from short T1 components for directly extracting myelin water signal in ViSTa imaging...
February 1, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29383263/intracardiac-ultrasound-to-detect-aneurysm-in-arrhythmogenic-right-ventricular-dysplasia-cardiomyopathy
#10
Cismaru Gabriel, Mihai Puiu, Radu Rosu, Lucian Muresan, Raluca Rancea, Gabriel Gusetu, Dana Pop, Dumitru Zdrenghea
Arrhythmogenic right ventricular dysplasia/cardiomyopathy is a genetic disorder characterized by fibrofattty replacement of the right ventricular myocardium. In the revised 2010 Task Force Criteria, a major criteria for ARVD/C is the presence of RV aneurysm by 2D echo. Our report demonstrates that intracardiac ultrasound can detect RV aneurysms and also focal absence of trabeculations which brings additional value to the diagnosis of ARVD/C. A 26-year-old male patient suffering from multiple sustained episodes of ventricular tachycardia was implanted with an internal cardiac defibrillator after confirmation of the disease by cardiac magnetic resonance imaging...
January 2018: Oxford Medical Case Reports
https://www.readbyqxmd.com/read/29344979/in-vivo-estimation-of-transverse-relaxation-time-constant-t2-of-17-human-brain-metabolites-at-3t
#11
Patrik O Wyss, Claudio Bianchini, Milan Scheidegger, Ioannis A Giapitzakis, Andreas Hock, Alexander Fuchs, Anke Henning
PURPOSE: The transverse relaxation times T2 of 17 metabolites in vivo at 3T is reported and region specific differences are addressed. METHODS: An echo-time series protocol was applied to one, two, or three volumes of interest with different fraction of white and gray matter including a total number of 106 healthy volunteers and acquiring a total number of 128 spectra. The data were fitted with the 2D fitting tool ProFit2, which included individual line shape modeling for all metabolites and allowed the T2 calculation of 28 moieties of 17 metabolites...
January 17, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29330619/mr-arthrography-of-the-hip-diagnostic-performance-and-image-quality-of-3d-steady-state-free-precession-versus-2d-turbo-spin-echo-sequences
#12
Mareen Sarah Kraus, Mike Notohamiprodjo, Sasan Partovi, Ahmed Sobieh, Andrea Baur-Melnyk, Joerg Hausdorf, Ulrich Grosse
OBJECTIVE: To retrospectively compare the diagnostic performance of isotropic 3D steady-state free precession (3D-SSFP) sequences with 2D turbo spin-echo proton density-weighted fat-saturated (2D-TSE-PD fs) images in hip magnetic resonance arthrography; arthroscopy was a standard of reference. METHODS: Eighty-one patients with suspected labral tears who underwent hip MR arthrography (3-T scanner) were included. 2D-TSE-PD fs sequences were acquired in three planes and a singular sagittal 3D-SSFP...
January 12, 2018: Skeletal Radiology
https://www.readbyqxmd.com/read/29324754/fast-quantitative-murine-cardiac-19f-mri-mrs-of-pfce-labeled-progenitor-stem-cells-and-macrophages-at-9-4t
#13
Christakis Constantinides, Mahon Maguire, Eileen McNeill, Ricardo Carnicer, Edyta Swider, Mangala Srinivas, Carolyn A Carr, Jurgen E Schneider
PURPOSE: To a) achieve cardiac 19F-Magnetic Resonance Imaging (MRI) of perfluoro-crown-ether (PFCE) labeled cardiac progenitor stem cells (CPCs) and bone-derived bone marrow macrophages, b) determine label concentration and cellular load limits, and c) achieve spectroscopic and image-based quantification. METHODS: Theoretical simulations and experimental comparisons of spoiled-gradient echo (SPGR), rapid acquisition with relaxation enhancement (RARE), and steady state at free precession (SSFP) pulse sequences, and phantom validations, were conducted using 19F MRI/Magnetic Resonance Spectroscopy (MRS) at 9...
2018: PloS One
https://www.readbyqxmd.com/read/29322551/improving-parallel-imaging-by-jointly-reconstructing-multi-contrast-data
#14
Berkin Bilgic, Tae Hyung Kim, Congyu Liao, Mary Kate Manhard, Lawrence L Wald, Justin P Haldar, Kawin Setsompop
PURPOSE: To develop parallel imaging techniques that simultaneously exploit coil sensitivity encoding, image phase prior information, similarities across multiple images, and complementary k-space sampling for highly accelerated data acquisition. METHODS: We introduce joint virtual coil (JVC)-generalized autocalibrating partially parallel acquisitions (GRAPPA) to jointly reconstruct data acquired with different contrast preparations, and show its application in 2D, 3D, and simultaneous multi-slice (SMS) acquisitions...
January 10, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29305613/optimized-time-resolved-echo-piv-ptv-measurements-elucidate-blood-flow-in-patients-with-left-ventricular-thrombus
#15
Kaushik Sampath, Thura T Harfi, Ricard/T George, Joseph Katz
Contrast ultrasound is a widely used clinical tool to obtain real-time qualitative blood flow assessments in the heart, liver, etc. Echocardiographic particle image velocimetry (echo-PIV) is a technique for obtaining quantitative velocity maps from contrast ultrasound images. However, unlike optical PIV, routine echo images are prone to non-uniform spatiotemporal variations in tracer distribution, making analysis difficult for standard PIV algorithms. This study introduces optimized procedures that integrate image enhancement, PIV and particle tracking velocimetry (PTV) to obtain reliable time-resolved 2D velocity distributions...
January 5, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29287134/prenatal-diagnosis-of-total-anomalous-pulmonary-venous-connection-by-2d-and-3d-fetal-echocardiography
#16
Ye Zhang, Qin Shao, Lin Sun, Shuping Ge, Yihua He
OBJECTIVE: Prenatal diagnosis of total anomalous pulmonary venous connection (TAPVC) by fetal echocardiography (FE) remains a challenge. We sought to ascertain the diagnostic accuracy of 2D and 3D spatiotemporal image correlation (STIC) FE and the potential incremental value of 3D STIC FE for prenatal diagnosis and assessment of TAPVC. METHODS: This study was conducted retrospectively in a single tertiary referral center. The study population consisted of 74 TAPVC from 17 063 fetuses by FE from August 2010 to April 2016...
December 2017: Echocardiography
https://www.readbyqxmd.com/read/29279148/3d-hybrid-profile-order-technique-in-a-single-breath-hold-3d-t2-weighted-fast-spin-echo-sequence-usefulness-in-diagnosis-of-small-liver-lesions
#17
Kenichiro Hirata, Takeshi Nakaura, Tomoyuki Okuaki, Noriko Tsuda, Narumi Taguchi, Seitaro Oda, Daisuke Utsunomiya, Yasuyuki Yamashita
PURPOSE: We compared the efficacy of three-dimensional (3D) isotropic T2-weighted fast spin-echo imaging using a 3D hybrid profile order technique with a single-breath-hold (3D-Hybrid BH) with a two-dimensional (2D) T2-weighted fast spin-echo conventional respiratory-gated (2D-Conventional RG) technique for visualising small liver lesions. MATERIALS AND METHODS: This study was approved by our institutional review board. The requirement to obtain written informed consent was waived...
January 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29276628/effect-of-slice-excitation-profile-on-ungated-steady-state-cardiac-perfusion-imaging
#18
Haonan Wang, Edward V R DiBella, Ganesh Adluru, Daniel J Park, Meredith I Taylor, Neal K Bangerter
In cardiac perfusion imaging, choice of flip angle is an important factor for steady state acquisition. This work focuses on presenting an analytical framework for understanding how non-ideal slice excitation profiles affect contrast in ungated 2D steady state cardiac perfusion studies, and to study a technique for estimating flip angle that maximizes enhanced/unenhanced myocardial contrast-to-noise ratio (CNR) in single slice and multi-slice acquisitions. A numerical simulation of ungated 2D golden ratio radial spoiled gradient echo (SPGR) was created that takes into consideration the actual (Bloch simulated) slice excitation profile...
April 2017: Biomedical Physics & Engineering Express
https://www.readbyqxmd.com/read/29260880/comparison-of-two-dimensional-fast-spin-echo-t2-weighted-sequences-and-three-dimensional-volume-isotropic-t2-weighted-fast-spin-echo-vista-mri-in-the-evaluation-of-triangular-fibrocartilage-of-the-wrist
#19
Hee Jin Park, So Yeon Lee, Kyung A Kang, Eun Young Kim, Hun Kyu Shin, Se Jin Park, Jai Hyung Park, Eugene Kim
OBJECTIVE: To compare image quality of three-dimensional volume isotropic T2-weighted fast spin-echo (3D VISTA) and 2D T2 weighted images (T2WI) for evaluation of triangular fibrocartilage (TFC) and to investigate whether 3D VISTA can replace 2D T2WI in evaluating TFC injury. METHODS: This retrospective study included 69 patients who received wrist MRIs using both 2D T2WI and 3D VISTA techniques for assessment of wrist pathology, including TFC injury. Two radiologists measured the signal-to-noise ratio (SNR) and the contrast-to-noise ratio (CNR) of the two sequences...
December 20, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29236342/longitudinal-assessment-of-rabbit-renal-fibrosis-induced-by-unilateral-ureteral-obstruction-using-two-dimensional-susceptibility-weighted-imaging
#20
Jing-Gang Zhang, Zhao-Yu Xing, Ting-Ting Zha, Xiao-Juan Tian, Ya-Nan Du, Jie Chen, Wei Xing
BACKGROUND: Previous studies indicated that two-dimensional-susceptibility weighted imaging (2D-SWI) could serve as a useful biomarker for differentiating the grade of liver fibrosis. PURPOSE: To evaluate the feasibility of 2D-SWI in the dynamic quantification of renal fibrosis in a rabbit model. STUDY TYPE: Longitudinal study. ANIMAL MODEL: Twenty-Four New Zealand White Rabbits including control group (n = 4); and renal fibrosis group (n = 20), by means of a unilateral ureteral obstruction (UUO) model...
December 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
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