Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Dec 2006
Comparative StudyDifferentiation of hepatocellular carcinoma and hepatic metastasis from cysts and hemangiomas with calculated T2 relaxation times and the T1/T2 relaxation times ratio.
To determine the diagnostic capability of the T1 and T2 relaxation times and the T1/T2 relaxation times ratio generated with the mixed turbo spin echo (mixed-TSE) pulse sequence, in order to discriminate between hepatocellular carcinoma (HCC)/metastases and hemangiomas/cysts. ⋯ Although there is high sensitivity and specificity associated with the use of T2 relaxation times alone to discriminate carcinoma/metastases from hemangiomas/cysts, using the T1/T2 relaxation times ratio threshold of 5.8 allowed proper classification of all lesions.
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J Magn Reson Imaging · Dec 2006
Measurement of DTI metrics in hemorrhagic brain lesions: possible implication in MRI interpretation.
To understand the biological basis of possible mechanisms responsible for increased fractional anisotropy (FA) in different stages of hemorrhage and hemorrhagic brain lesions. ⋯ Intact RBCs entangled within fibrin mesh appear to be responsible for high FA in hemorrhagic brain lesions.
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J Magn Reson Imaging · Dec 2006
Assessment of lung development using hyperpolarized helium-3 diffusion MR imaging.
To determine whether hyperpolarized helium-3 (HHe) diffusion MR can detect the expected enlargement of alveoli that occurs with lung growth during childhood. ⋯ HHe diffusion MR appears to detect the expected increase in alveolar size during childhood, and thus HHe MR may be a noninvasive method to assess development of the lung microstructure.
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J Magn Reson Imaging · Dec 2006
Statistical representation of mean diffusivity and fractional anisotropy brain maps of normal subjects.
To create diffusion tensor atlases from echo planar imaging (EPI) images acquired at 3 T in 10 normal subjects. ⋯ A high-resolution, diffusion MR atlas with full brain coverage was developed. Additionally, maps of the SD of the diffusion indices were also generated to provide an estimate of the variance within a normal population. Active shape and texture models were also generated for the corpus callosum as an alternate method of representing the variance in morphology and diffusion indices.
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J Magn Reson Imaging · Dec 2006
Renal perfusion: comparison of saturation-recovery TurboFLASH measurements at 1.5T with saturation-recovery TurboFLASH and time-resolved echo-shared angiographic technique (TREAT) at 3.0T.
To investigate the dependence of semiquantitative renal perfusion parameters on the acquisition technique and field strength used. ⋯ Semiquantitative renal perfusion measurements are feasible with time-resolved echo-shared sequences and TurboFLASH techniques. While MTT and TTP appear to be independent of the technique and field strength applied, MUS and MSI are higher with TREAT.