Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Feb 2014
Comparative StudyEvaluation of hepatic focal lesions using diffusion-weighted MR imaging: comparison of apparent diffusion coefficient and intravoxel incoherent motion-derived parameters.
To determine whether parameters obtained from intravoxel incoherent motion (IVIM)-diffusion-weighted imaging (DWI) using multiple b-values can improve characterization of common focal liver lesions (FLLs), compared with the apparent diffusion coefficient (ADCtotal ). ⋯ Dt provided better diagnostic performance than ADCtotal in differentiating benign from malignant lesions. Dp and f were significant parameters for diagnosing hypervascular FLLs.
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J Magn Reson Imaging · Feb 2014
Comparative StudyIntra- and interscanner reliability and reproducibility of 3D whole-brain pseudo-continuous arterial spin-labeling MR perfusion at 3T.
To assess the reliability and reproducibility of pseudo-continuous arterial spin labeling (pCASL). Intra- and interscanner reliability and reproducibility are essential before pooling perfusion imaging data. ⋯ Although excellent intra- and interscanner reliability and reproducibility could support the feasibility of cross-site pooling of ASL data, pCASL with multiple PLDs may better assess the CBF of the human brain.
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J Magn Reson Imaging · Feb 2014
Effects of receive-only inserts on specific absorption rate, B1 (+) field, and Tx coil performance.
To evaluate the effect of different cylindrical and close-conforming receive-only array designs on spin excitation and specific absorption rate (SAR) of a 7 T transmit-only head coil. ⋯ Changes in local/global SAR and subtle changes in B1 (+) field distributions were observed in the presence of Rx-only inserts. Thus, incorporation of the receive-only array effects are needed when evaluating SAR and designing RF transmit pulse waveform parameters for shimming and/or Tx-SENSE for 7 T MRI.
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J Magn Reson Imaging · Feb 2014
Whole-body MR angiography: first experiences with the new TimCT technology with single contrast injection.
To assess image quality, presence of artifacts, arterial stenosis, and interobserver agreement of Tim-CT in assessment of the arterial system using contrast-enhanced whole-body-MRA (CE-Wb-MRA) with a single contrast-medium injection in patients with arteriosclerosis. ⋯ CE-Wb-MRA using the TimCT technology and with a single contrast injection is a feasible tool for whole-body MRA.
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J Magn Reson Imaging · Jan 2014
Comparative StudyPotential of computer-aided diagnosis of high spectral and spatial resolution (HiSS) MRI in the classification of breast lesions.
To compare the performance of computer-aided diagnosis (CADx) analysis of precontrast high spectral and spatial resolution (HiSS) MRI to that of clinical dynamic contrast-enhanced MRI (DCE-MRI) in the diagnostic classification of breast lesions. ⋯ CADx of HiSS (without contrast) performed similarly to CADx on clinical DCE-MRI; thus, computerized analysis of HiSS may provide sufficient information for diagnostic classification. The results are clinically important for patients in whom contrast agent is contra-indicated. Even in the limited acquisition mode of 2D single slice HiSS, by using quantitative image analysis to extract characteristics from the HiSS images, similar performance levels were obtained as compared with those from current clinical 4D DCE-MRI. As HiSS acquisitions become possible in 3D, CADx methods can also be applied. Because HiSS and DCE-MRI are based on different contrast mechanisms, the use of the two protocols in combination may increase diagnostic accuracy.