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https://www.readbyqxmd.com/read/29904489/intracardiac-extension-of-intravenous-leiomyoma-a-rare-phenomenon-a-case-report
#1
Aileen Peña, Marvin Tamaña
Leiomyoma of uterine origin is a common histologically benign neoplasm in women; however, growth intravenously with intracardiac extension is a rare phenomenon. This is a diagnostic challenge that can present with varied clinical manifestations and multiple differential diagnosis. This is a case of a 45-year-old female patient with chest heaviness and an intracardiac mass on 2-dimensional (2D) echocardiogram. Previous history of hysterectomy was likewise noted. Imaging workup, including 2D echocardiogram and contrast-enhanced chest and abdomen computed tomography scans, was performed which demonstrated a large, heterogeneous, elongated filling defect in the right atrium and right ventricle extending to the inferior vena cava, left renal vein, and left gonadal vein...
April 2018: Radiology Case Reports
https://www.readbyqxmd.com/read/29898736/3d-whole-brain-vessel-wall-cardiovascular-magnetic-resonance-imaging-a-study-on-the-reliability-in-the-quantification-of-intracranial-vessel-dimensions
#2
Na Zhang, Fan Zhang, Zixin Deng, Qi Yang, Marcio A Diniz, Shlee S Song, Konrad H Schlick, M Marcel Maya, Nestor Gonzalez, Debiao Li, Hairong Zheng, Xin Liu, Zhaoyang Fan
BACKGROUND: One of the potentially important applications of three-dimensional (3D) intracranial vessel wall (IVW) cardiovascular magnetic resonance (CMR) is to monitor disease progression and regression via quantitative measurement of IVW morphology during medical management or drug development. However, a prerequisite for this application is to validate that IVW morphologic measurements based on the modality are reliable. In this study we performed comprehensive reliability analysis for the recently proposed whole-brain IVW CMR technique...
June 14, 2018: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29895817/when-a-pseudo-infarct-electrocardiogram-ecg-pattern-in-a-posterior-accessory-wolff-parkinson-white-pathway-masks-a-true-inferior-infarct
#3
Muhammad U Butt, Ripa Patel, Yousef H Darrat, Gustavo X Morales, Claude S Elayi
BACKGROUND Wolff-Parkinson-White (WPW) pattern is due to a pre-excitation leading to characteristic ECG changes in sinus rhythm as short PR interval, the presence of delta waves, wide QRS complexes, and potentially Q wave-T wave vector discordance (pseudo-infarct pattern). These later changes can mask the underlying ECG depolarizing solely through the His-Purkinje system. Our case highlights how the ECG of a WPW pattern with a pseudo-infarct pattern can in fact mask a true infarct on the underlying ECG without pre-excitation...
June 13, 2018: American Journal of Case Reports
https://www.readbyqxmd.com/read/29882188/feasibility-of-transthoracic-echocardiography-evaluation-of-pulmonary-arteries-following-arterial-switch-operation
#4
Sean M Lang, R Lee Crawford, Pushpa Shivaram, Joshua A Daily, Elijah H Bolin, Xinyu Tang, R Thomas Collins
Pulmonary artery (PA) stenosis is the most common late sequela following arterial switch for d-transposition of the great arteries. The purpose of this study was to assess the effectiveness of transthoracic echocardiography in evaluating the pulmonary arteries following repair. This was a retrospective, cross-sectional analysis of all echocardiograms performed on patients following arterial switch operation. A numerical scoring system was devised and used to quantify PA visualization based on 2D images, color mapping, and spectral Doppler...
June 7, 2018: Pediatric Cardiology
https://www.readbyqxmd.com/read/29879598/comparing-lesion-detection-of-infratentorial-multiple-sclerosis-lesions-between-t2-weighted-spin-echo-2d-flair-and-3d-flair-sequences
#5
Kevin Y Wang, Tomas A Uribe, Christie M Lincoln
PURPOSE: Infratentorial lesions in patients with multiple sclerosis are associated with long-term disability. Two-dimensional fluid-attenuated inversion recovery demonstrates poor infratentorial lesion detection when compared to T2-weighted spin echo. Evidence of improved detection with 3D fluid-attenuated inversion recovery has been conflicting. This study compares the infratentorial lesion detection performance, observer performance, and signal and contrast properties between T2-weighted spin echo, 2D, and 3D fluid-attenuated inversion recovery...
May 29, 2018: Clinical Imaging
https://www.readbyqxmd.com/read/29866123/a-pilot-study-of-short-t2-measurements-with-ultrashort-echo-time-imaging-at-0-35-t
#6
Xiuyuan Chen, Bensheng Qiu
PURPOSE: Ultrashort echo time (UTE) sequences play a key role in imaging and quantifying short T2 species. However, almost all of the relevant studies was conducted at relatively high fields. The purpose of this work was to further explore the feasibility of UTE imaging and T2* measurement for short T2 species at low fields. METHODS: A 2D UTE sequence with an echo time (TE) of 0.37 ms was developed on a 0.35 T permanent magnet scanner. This sequence acquires multiecho images to fit the monoexponential signal decay model for quantitative T2* calculations...
June 4, 2018: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29861348/using-synthetic-ct-for-partial-brain-radiation-therapy-impact-on-image-guidance
#7
Eric D Morris, Ryan G Price, Joshua Kim, Lonni Schultz, M Salim Siddiqui, Indrin Chetty, Carri Glide-Hurst
PURPOSE: Recent advancements in synthetic computed tomography (synCT) from magnetic resonance (MR) imaging data have made MRI-only treatment planning feasible in the brain, although synCT performance for image guided radiation therapy (IGRT) is not well understood. This work compares geometric equivalence of digitally reconstructed radiographs (DRRs) from CTs and synCTs for brain cancer patients and quantifies performance for partial brain IGRT. METHODS AND MATERIALS: Ten brain cancer patients (12 lesions, 7 postsurgical) underwent MR-SIM and CT-SIM...
April 6, 2018: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29857871/acceleration-techniques-and-their-impact-on-arterial-input-function-sampling-non-accelerated-versus-view-sharing-and-compressed-sensing-sequences
#8
Matthias R Benz, Georg Bongartz, Johannes M Froehlich, David Winkel, Daniel T Boll, Tobias Heye
PURPOSE: The aim was to investigate the variation of the arterial input function (AIF) within and between various DCE MRI sequences. MATERIAL AND METHODS: A dynamic flow-phantom and steady signal reference were scanned on a 3T MRI using fast low angle shot (FLASH) 2d, FLASH3d (parallel imaging factor (P) = P0, P2, P4), volumetric interpolated breath-hold examination (VIBE) (P = P0, P3, P2 × 2, P2 × 3, P3 × 2), golden-angle radial sparse parallel imaging (GRASP), and time-resolved imaging with stochastic trajectories (TWIST)...
July 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29845659/assessment-of-renal-fibrosis-in-murine-diabetic-nephropathy-using-quantitative-magnetization-transfer-mri
#9
Feng Wang, Daisuke Katagiri, Ke Li, Keiko Takahashi, Suwan Wang, Shinya Nagasaka, Hua Li, C Chad Quarles, Ming-Zhi Zhang, Akira Shimizu, John C Gore, Raymond C Harris, Takamune Takahashi
PURPOSE: Renal fibrosis is a hallmark of progressive renal disease; however, current clinical tests are insufficient for assessing renal fibrosis. Here we evaluated the utility of quantitative magnetization transfer MRI in detecting renal fibrosis in a murine model of progressive diabetic nephropathy (DN). METHODS: The db/db eNOS-/- mice, a well-recognized model of progressive DN, and normal wild-type mice were imaged at 7T. The quantitative magnetization transfer data were collected in coronal plane using a 2D magnetization transfer prepared spoiled gradient echo sequence with a Gaussian-shaped presaturation pulse...
May 30, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29804801/retrospective-self-sorted-4d-mri-for-the-liver
#10
Tessa N van de Lindt, Martin F Fast, Uulke A van der Heide, Jan-Jakob Sonke
PURPOSE: Daily MRI-guidance for liver radiotherapy is becoming possible on an MR-Linac. The purpose of this study was to develop a 4D-MRI strategy using an image-based respiratory signal with an acquisition-reconstruction time <5 min, providing T2-weighting for non-contrast enhanced tumor visibility. MATERIALS AND METHODS: Images were acquired using an axial multi-slice 2D Turbo Spin Echo (TSE) sequence, repeated a variable number of times (dynamics). A self-sorting signal (SsS) was retrieved from the data by computing correlation coefficients between all acquired slices...
May 24, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29799635/comparison-of-functional-localization-accuracy-with-different-co-registration-strategies-in-presurgical-fmri-for-brain-tumor-patients
#11
Mu-Lan Jen, Islam Hassan, Ping Hou, Guang Li, Ashok J Kumar, Sujit S Prabhu, Rivka R Colen, Ho-Ling Liu
PURPOSE: Presurgical fMRI is an important tool for surgery navigation in achieving maximum resection of a brain tumor. However, the functional localization accuracy may be compromised by spatial transformation from echo-planar images to high-resolution structural images. We evaluated functional localization errors associated with the spatial transformation process by using three algorithms commonly applied to the presurgical fMRI in the clinic. METHODS: MR images of 20 brain tumor patients for presurgical evaluation of eloquent areas near motor cortices were analyzed...
May 25, 2018: Medical Physics
https://www.readbyqxmd.com/read/29785460/rapid-measurement-of-long-range-distances-in-proteins-by-multidimensional-13-c-19-f-redor-nmr-under-fast-magic-angle-spinning
#12
Alexander A Shcherbakov, Mei Hong
The ability to simultaneously measure many long-range distances is critical to efficient and accurate determination of protein structures by solid-state NMR (SSNMR). So far, the most common distance constraints for proteins are 13 C-15 N distances, which are usually measured using the rotational-echo double-resonance (REDOR) technique. However, these measurements are restricted to distances of up to ~ 5 Å due to the low gyromagnetic ratios of 15 N and 13 C. Here we present a robust 2D 13 C-19 F REDOR experiment to measure multiple distances to ~ 10 Å...
May 21, 2018: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/29783724/quadratic-frequency-modulation-signals-parameter-estimation-based-on-two-dimensional-product-modified-parameterized-chirp-rate-quadratic-chirp-rate-distribution
#13
Zhiyu Qu, Fuxin Qu, Changbo Hou, Fulong Jing
In an inverse synthetic aperture radar (ISAR) imaging system for targets with complex motion, the azimuth echo signals of the target are always modeled as multicomponent quadratic frequency modulation (QFM) signals. The chirp rate (CR) and quadratic chirp rate (QCR) estimation of QFM signals is very important to solve the ISAR image defocus problem. For multicomponent QFM (multi-QFM) signals, the conventional QR and QCR estimation algorithms suffer from the cross-term and poor anti-noise ability. This paper proposes a novel estimation algorithm called a two-dimensional product modified parameterized chirp rate-quadratic chirp rate distribution (2D-PMPCRD) for QFM signals parameter estimation...
May 19, 2018: Sensors
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
#14
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/29748204/a-qualitative-and-quantitative-correlation-study-of-lumbar-intervertebral-disc-degeneration-using-glycosaminoglycan-chemical-exchange-saturation-transfer-pfirrmann-grade-and-t1-%C3%AF
#15
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/29736835/value-of-two-dimensional-shear-wave-elastography-for-assessing-acute-liver-congestion-in-a-bama-mini-pig-model
#16
Li-Ting Xie, Dan-Xia Xu, Guo Tian, Li-Yun Zhong, Qi-Yu Zhao, Qing-Hong Ke, Tian-An Jiang
BACKGROUND: To date, liver congestion is one of the most significant clinical diseases. However, few studies have profoundly investigated the development, pathology, and prognosis of the important problems associated with acute hepatic congestion. AIMS: To explore the value of noninvasive two-dimensional shear wave elastography (2D-SWE) for assessing acute liver congestion in an animal model. METHODS: Six healthy Bama mini-pigs were used for this research and randomly divided into the experimental group and control group...
May 8, 2018: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/29724768/identification-of-chronic-active-multiple-sclerosis-lesions-on-3t-mri
#17
M Absinta, P Sati, A Fechner, M K Schindler, G Nair, D S Reich
BACKGROUND AND PURPOSE: MR imaging-pathologic studies have reported that paramagnetic rims on 7T susceptibility-based MR imaging identify, in vivo, the subset of MS lesions with compartmentalized inflammation at the lesion edge and associated remyelination failure. Here, we assessed the reliability of detecting these rims on high-resolution 3T phase images. MATERIALS AND METHODS: High-resolution T2* and phase MR imaging was collected in 20 patients with MS at 3T (3D segmented EPI, 0...
May 3, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29724583/evaluation-of-tricuspid-annular-plane-systolic-excursion-measured-by-two-dimensional-echocardiography-in-healthy-dogs-repeatability-reference-intervals-and-comparison-with-m-mode-assessment
#18
L C Visser, D J Sintov, M S Oldach
INTRODUCTION: We sought to determine the feasibility, measurement variability, and within-day repeatability of tricuspid annular plane systolic excursion (TAPSE) measured by two-dimensional echocardiography (2D TAPSE), generate reference intervals for 2D TAPSE, assess agreement and correlation between 2D TAPSE and the conventional TAPSE measured by M-mode echocardiography (MM TAPSE), and to assess the ability of 2D TAPSE to track a drug-induced decrease in right ventricular (RV) function compared with MM TAPSE...
April 30, 2018: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/29707845/ultra-high-b-radial-diffusion-weighted-imaging-uhb-rdwi-of-human-cervical-spinal-cord
#19
Bijaya Thapa, Nabraj Sapkota, YouJung Lee, Kyle Jeong, John Rose, Lubdha M Shah, Erica Bisson, Eun-Kee Jeong
BACKGROUND: Injury in the cervical spinal cord (CSC) can lead to varying degrees of neurologic deficit and persistent disability. Diffusion tensor imaging (DTI) is a promising method to evaluate white matter integrity and pathology. However, the conventional DTI results are limited with respect to the specific details of neuropathology and microstructural architecture. In this study we used ultrahigh-b radial-DWI (UHb-rDWI) with b-values ranging from 0 to ∼7500 s/mm2 and calculated decay constant (DH ) at the high b-values, which gives much deeper insight about the microscopic environment of CSC white matter...
April 29, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29700129/regional-myocardial-perfusion-disturbance-in-experimental-chronic-chagas-cardiomyopathy
#20
Luciano F L Oliveira, James T Thackeray, José A Marin Neto, Minna M D Romano, Eduardo E V Carvalho, Jorge Mejia, Denise M Tanaka, Grace K Silva, Douglas R Abdalla, Carlos Malamut, Frank M Bengel, Maria L Higuchi, André Schmidt, Edécio Cunha-Neto, Marcus V Simões
Background: Altered myocardial perfusion is a common finding in chronic Chagas cardiomyopathy (CCC), but its underlying histologic changes have not been elucidated. We investigated the occurrence of myocardial perfusion defects (MPD) and the correlated regional changes to histology in an experimental model of CCC in hamsters. Methods: Female Syrian hamsters ( n = 34) were infected with 3.5x104 to 105 trypomastigote forms of T. cruzi Y-strain and 6 to 10 months afterwards were submitted to in vivo imaging including: rest 99m Tc-sestamibi SPECT imaging, segmental and global left ventricular (LV) function assessment by using 2D-echocardiogram, and 18 F-FDG PET for evaluation of myocardial viability...
April 26, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
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