Journal of magnetic resonance imaging : JMRI
-
J Magn Reson Imaging · Jun 2005
Comparative StudyNavigator-gated three-dimensional MR angiography of the pulmonary arteries using steady-state free precession.
To assess the quality of a navigator-gated, free breathing, steady-state free precession (SSFP) technique in comparison to a single breathhold for pulmonary artery imaging in normal volunteers. ⋯ The navigator-gated SSFP sequence is able to acquire images equal in quality to the breathhold sequence. This may be of clinical importance for pulmonary imaging in patients who are unable to sustain a long breathhold.
-
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.
-
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.
-
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.
-
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.