Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Jun 2005
Application of refocused steady-state free-precession methods at 1.5 and 3 T to in vivo high-resolution MRI of trabecular bone: simulations and experiments.
To evaluate the potential of fully-balanced steady-state free-precession (SSFP) sequences in in vivo high-resolution (HR) MRI of trabecular bone at field strengths of 1.5 and 3 T by simulation and experimental methods. ⋯ Single-acquisition SSFP (at 1.5 T) and multiple-acquisition SSFP (at 3 T) hold great potential for HR-MRI of trabecular bone.
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J Magn Reson Imaging · Jun 2005
Quantitative perfusion measurements using pulsed arterial spin labeling: effects of large region-of-interest analysis.
To study arterial spin labeling (ASL) MRI techniques and to investigate various problematic issues that still hinder the accurate and robust quantitative analysis of ASL data. ⋯ Analysis of ASL data based on a large ROI may suffer from inaccuracies arising from a distribution of transit times, implying that averaging of ASL kinetic data over such regions should therefore be avoided. When possible, a PBP fit should be performed.
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J Magn Reson Imaging · Jun 2005
Diffusion-weighted MRI of the lung with hyperpolarized helium-3: a study of reproducibility.
To determine the reproducibility of several parameters of the ADC measurement by calculating the scan-to-scan intrasubject variability. ⋯ Diffusion-weighted imaging (DWI) is a well-reproducible method for assessing the lung microstructure.
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J Magn Reson Imaging · Jun 2005
Comparative StudyHigh-dose Gd-DTPA vs. Bis-Gd-mesoporphyrin for monitoring laser-induced tissue necrosis.
To compare Bis-Gd-mesoporphyrin (Bis-Gd-MP), a contrast agent with a reported high affinity to necrotic tissue, with high-dose gadopentate dimeglumin (Gd-DTPA) for defining laser-induced muscle and liver necrosis by contrast-enhanced (CE) MRI. ⋯ Bis-Gd-MP and Gd-DTPA are equally well suited for postinterventional lesion assessment in LITT.