Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Apr 2009
High-resolution fMRI with higher-order generalized series imaging and parallel imaging techniques (HGS-parallel).
To develop a novel approach for high-resolution functional MRI (fMRI) using the conventional gradient-echo sequence. ⋯ This study suggests that the proposed method can be used for high-resolution fMRI studies without the geometric distortion and the Nyquist ghost artifacts compared to EPI.
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J Magn Reson Imaging · Apr 2009
Randomized Controlled Trial Multicenter Study Comparative StudyMulticenter, double-blind, randomized, intra-individual crossover comparison of gadobenate dimeglumine and gadopentetate dimeglumine in MRI of brain tumors at 3 tesla.
To prospectively compare 0.1 mmol/kg doses of gadobenate dimeglumine and gadopentetate dimeglumine for contrast-enhanced MRI of brain lesions at 3 Tesla (T). ⋯ Brain lesion depiction at 3T is significantly improved with 0.1 mmol/kg gadobenate dimeglumine.
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J Magn Reson Imaging · Apr 2009
Comparative StudyAccelerated phase-contrast MR imaging: comparison of k-t BLAST with SENSE and Doppler ultrasound for velocity and flow measurements in the aorta.
To evaluate differences in velocity and flow measurements in the aorta between accelerated phase-contrast (PC) magnetic resonance imaging (MRI) using SENSE and k-t BLAST and in peak velocity to Doppler ultrasound. ⋯ Peak velocity of accelerated PC-MRI correlated with CW Doppler measurements, but high k-t BLAST acceleration factors lead to a significant underestimation. SENSE with R = 2 and 2-fold k-t BLAST are most highly correlated in phase-contrast flow measurements.
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J Magn Reson Imaging · Apr 2009
Diffusion tensor and tensor metrics imaging in intracranial epidermoid cysts.
To explore the utility of diffusion tensor imaging (DTI) and diffusion tensor metrics (DTM) in characterizing the structural pathology of epidermoid cysts. DTI gives information about the tissue structure; a high fractional anisotropy (FA) indicates a highly structured orientation of the tissue, fibers, or white matter tracts. Based on the tensor rank, a set of three metrics has been described that can be used to measure the directional dependence of diffusion: linear anisotropy (CL), planar anisotropy (CP), and spherical anisotropy (CS). DTM takes into account the shape of diffusion anisotropy and hence may provide better insight into the orientation of structures than FA. ⋯ High CP values suggest preferential diffusion of water molecules along a two-dimensional geometry, which could be attributed to the well-structured orientation of keratin filaments and flakes within the tumor as demonstrated by histopathology. Advanced imaging modalities like DTI with DTM can provide information regarding the microstructural anatomy of the epidermoid cysts.
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J Magn Reson Imaging · Apr 2009
High-resolution diffusion tensor imaging with inner field-of-view EPI.
To demonstrate the applicability of inner field-of-view (FOV) echo-planar imaging based on spatially two-dimensional selective radiofrequency excitations to high-resolution diffusion tensor imaging. ⋯ Inner FOV echo-planar imaging may help to improve the spatial resolution and thus the accuracy of diffusion anisotropy and white matter fiber orientation measurements in the human central nervous system.