Results 21 to 30 of about 423 (47)

Improving the Sensitivity of Task-Based Multi-Echo Functional Magnetic Resonance Imaging via T₂* Mapping Using Synthetic Data-Driven Deep Learning

Brain Sciences
(1) Background: Functional magnetic resonance imaging (fMRI) utilizing multi-echo gradient echo-planar imaging (ME-GE-EPI) has demonstrated higher sensitivity and stability compared to utilizing single-echo gradient echo-planar imaging (SE-GE-EPI).
Yinghe Zhao, Qinqin Yang, Shiting Qian, Jiyang Dong, Shuhui Cai, Zhong Chen, Congbo Cai   +6 more
doaj   +1 more source

A Rotational Cylindrical fMRI Phantom for Image Quality Control. [PDF]

PLoS ONE, 2015
A novel phantom for image quality testing for functional magnetic resonance imaging (fMRI) scans is described.The cylindrical, rotatable, ~4.5L phantom, with eight wedge-shaped compartments, is used to simulate rest and activated states. The compartments
David A Tovar, Wang Zhan, Sunder S Rajan
doaj   +1 more source

Turbo Gradient and Spin Echo PROPELLER-Diffusion Weighted Imaging for Orbital Tumors: A Comparative Study With Readout-Segmented Echo-Planar Imaging

Frontiers in Neuroscience, 2021
Purpose: To qualitatively and quantitatively compare the image quality and diagnostic performance of turbo gradient and spin echo PROPELLER diffusion-weighted imaging (TGSE-PROPELLER-DWI) vs.
Qing Fu, Qing Fu, Xiang-chuang Kong, Xiang-chuang Kong, Ding-Xi Liu, Ding-Xi Liu, Kun Zhou, Yi-hao Guo, Zi-Qiao Lei, Zi-Qiao Lei, Chuan-sheng Zheng, Chuan-sheng Zheng, Fan Yang, Fan Yang   +13 more
doaj   +1 more source

Fast B1 mapping based on double-angle method with T1 correction using standard pulse sequence

Journal of Medical Physics, 2022
Radiofrequency (RF) field (B1) mapping by combining the double-angle method (DAM) and T1 correction was investigated. The signal intensities S1 and S2 acquired by flip angle (FA) α and double FA 2α at short repetition time (TR) were converted to a signal
Yoshiyuki Ishimori, Takeshi Shimanuki, Tomoya Kobayashi, Masahiko Monma   +3 more
doaj   +1 more source

Echo-Planar J-resolved Spectroscopic Imaging using Dual Read-outs: Implementation and Quantitation of Human Brain Metabolites

Scientific Reports, 2017
Attempts have been made to reduce the total scan time in multi-dimensional J-resolved spectroscopic imaging (JRESI) using an echo-planar (EP) readout gradient, but acquisition duration remains a limitation for routine clinical use in the brain.
Manoj K. Sarma, Rajakumar Nagarajan, Zohaib Iqbal, Paul M. Macey, M. Albert Thomas   +4 more
doaj   +1 more source

Locally advanced rectal cancer: 3D diffusion-prepared stimulated-echo turbo spin-echo versus 2D diffusion-weighted echo-planar imaging

European Radiology Experimental, 2020
Background Diffusion-weighted imaging (DWI) has shown great value in rectal cancer imaging. However, traditional DWI with echo-planar imaging (DW-EPI) often suffers from geometrical distortions.
Qinwei Zhang, Petra J. van Houdt, Doenja M. J. Lambregts, Baukelien van Triest, Marnix P. M. Kop, Bram F. Coolen, Gustav J. Strijkers, Uulke A. van der Heide, Aart J. Nederveen   +8 more
doaj   +1 more source

Myocardial first-pass perfusion imaging with hybrid-EPI: frequency-offsets and potential artefacts

Journal of Cardiovascular Magnetic Resonance, 2012
Background First-pass myocardial perfusion is often imaged with a tailored hybrid centric interleaved echo-planar-imaging sequence, providing rapid image acquisition with good contrast enhancement. The centric interleaved phase-encode order minimises the
Ferreira Pedro F, Gatehouse Peter D, Firmin David N   +2 more
doaj   +1 more source

Diagnostic performance of multishot echo-planar imaging (RESOLVE) and non-echo-planar imaging (HASTE) diffusion-weighted imaging in cholesteatoma with an emphasis on signal intensity ratio measurement

Diagnostic and Interventional Radiology
PURPOSE: To evaluate the diagnostic efficacy of multishot echo-planar imaging (EPI) [RESOLVE (RS)] and non-EPI (HASTE) diffusion-weighted imaging (DWI) in detecting cholesteatoma (CHO), and to explore the role of signal intensity (SI) ratio measurements ...
Ahmet Bozer, Zehra Hilal Adıbelli, Yeşim Yener, Abdullah Dalgıç   +3 more
doaj   +1 more source

Ultrafast bold fMRI using single-shot spin-echo echo planar imaging

Journal of Medical Physics, 2009
The choice of imaging parameters for functional MRI can have an impact on the accuracy of functional localization by affecting the image quality and the degree of blood oxygenation-dependent (BOLD) contrast achieved.
Boujraf Said, Summers Paul, Belahsen Faouzi, Prussmann Klaas, Kollias Spyros   +4 more
doaj  

The Use of Serial Non EPI DWI MRI Scans to Determine the Growth of Cholesteatoma

Bengal Journal of Otolaryngology and Head Neck Surgery, 2021
Introduction  It is an established practice to use non-EPI DWI MRI scans to detect the presence of cholesteatoma post operatively.  In the present era of Covid-19 where routine surgery to remove cholesteatoma has been suspended resulting in ...
Wendy K Smith, Leena Naidu, Hemanth Kowdley Subrahmanyam   +2 more
doaj   +1 more source