Journal of magnetic resonance imaging : JMRI
-
J Magn Reson Imaging · Nov 2013
Application of time-resolved angiography with stochastic trajectories (TWIST)-Dixon in dynamic contrast-enhanced (DCE) breast MRI.
To evaluate a magnetic resonance imaging (MRI) technique that integrates time-resolved angiography with stochastic trajectories (TWIST) view sharing and Dixon for a breast dynamic contrast-enhanced (DCE)-MRI application. ⋯ With proper parameters, TWIST-Dixon provides higher perceived SNR, more accurate fat suppression, and better overall image quality for breast DCE-MRI without sacrificing accuracy in the enhancement estimation.
-
J Magn Reson Imaging · Nov 2013
Comparative StudyUsefulness of the SPACE pulse sequence at 1.5T MR cholangiography: comparison of image quality and image acquisition time with conventional 3D-TSE sequence.
To prospectively evaluate the image quality and image acquisition time at 3D magnetic resonance cholangiopancreatography (MRCP) using sampling perfection with application optimized contrasts (SPACE) and conventional turbo-spin-echo (TSE) sequences. ⋯ On the 1.5T MR scanner, 3D-MRCP with the SPACE sequence significantly improved the contrast and CNR of CBD. In addition, it yielded images of better quality at 30% shorter acquisition time than constant refocusing pulse flip angle TSE.
-
J Magn Reson Imaging · Nov 2013
Comparative StudyEffects of the use of multiple scanners and of scanner upgrade in longitudinal voxel-based morphometry studies.
To evaluate the effects of inter-scanner variability (bias) and of scanner upgrade on longitudinal changes in regional gray matter volume. ⋯ The results of our study indicate that, even with scanners of the exact same model, the use of different scanners at different time points significantly influences longitudinal morphometric results, and that scanner upgrade has effects comparable to those of using different scanners at different time points.
-
J Magn Reson Imaging · Nov 2013
Accuracy of equilibrium magnetization mapping in sliced two-dimensional spoiled gradient-recalled echo pulse sequence with variable flip angle.
To evaluate the accuracy of an equilibrium magnetization (M0 ) map obtained using a two-dimensional (2D) spoiled gradient-recalled echo (SPGR) pulse sequence with variable flip angle (VFA). ⋯ M0 values calculated from 2D SPGR-VFA images are highly quantitative.
-
J Magn Reson Imaging · Nov 2013
Cerebral blood flow quantification in swine using pseudo-continuous arterial spin labeling.
To develop quantitative cerebral blood flow (CBF) imaging using pseudo-continuous arterial spin labeling (PCASL) in swine, accounting for their cerebrovascular anatomy and physiology. ⋯ This study demonstrates the feasibility of PCASL for CBF quantification in swine. Quantification of CBF using PCASL in swine can be further developed as an accessible and cost-effective model of human cerebral perfusion for investigating injuries that affect blood flow.