Journal of magnetic resonance imaging : JMRI
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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.
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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.
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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.
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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.
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J Magn Reson Imaging · Nov 2013
MRI-based prediction of pulsed high-intensity focused ultrasound effect on tissue transport in rabbit muscle.
To design an algorithm for optimizing pulsed high intensity focused ultrasound (p-HIFU) treatment parameters to maximize tissue transport while minimizing thermal necrosis based on MR image guidance. ⋯ Successful p-HIFU treatment was mainly correlated to tissue heating. Tissue transport properties following treatment success would result in improved contact between drug and targets in both time and space. MRI is the key to controlling treatment by means of thermometry and also monitoring efficacy by means of T2-weighted imaging.