Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Sep 2005
Comparative StudyComparison of Gd [DTPA-bis (2-aminoethoxy) ethane] polymeric contrast agent with gadodiamide injection for interstitial MR lymphography: experimental study with rabbits.
To compare the differences between macromolecular and small molecular contrast agents in interstitial magnetic resonance (MR) lymphography. ⋯ Interstitial MR lymphography with polymeric Gd-poly-DTPA-EOEA enhancer enables more sufficient and reliable visualization of lymph nodes compared to small molecular gadodiamide.
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J Magn Reson Imaging · Sep 2005
Comparative StudyThree-dimensional contrast-enhanced steady-state free precession for improved catheter-directed coronary magnetic resonance angiography.
To demonstrate the feasibility of three-dimensional thick-partition, contrast-enhanced, catheter-directed coronary artery magnetic resonance angiography (MRA) and test the hypothesis that three-dimensional imaging improves coronary artery background contrast-to-noise ratio (CNR) compared to two-dimensional imaging. ⋯ Three-dimensional thick-partition, contrast-enhanced, catheter-directed coronary MRA is feasible and improves CNR over two-dimensional projection imaging.
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J Magn Reson Imaging · Sep 2005
Combined T1-T2 mapping of human femoro-tibial cartilage with turbo-mixed imaging at 1.5T.
To evaluate the influence of Gd-DTPA on cartilage T2 mapping using turbo-mixed (tMIX) imaging, and to show the possible usefulness of the tMIX technique for simultaneously acquiring T1 and T2 information in cartilage. ⋯ The absolute difference of pre- and postcontrast T2 is very small and is ruled out using the back-calculation algorithm. Combined T1-T2 tMIX cartilage mapping is a valuable alternative for separate T1 and T2 cartilage mapping.
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J Magn Reson Imaging · Sep 2005
The impact of partial-volume effects in dynamic susceptibility contrast magnetic resonance perfusion imaging.
To demonstrate the degree of the cerebral blood flow (CBF) estimation bias that could arise from distortion of the arterial input function (AIF) as a result of partial-volume effects (PVEs) in dynamic susceptibility contrast (DSC) magnetic resonance imaging (MRI). ⋯ PVE can induce significant CBF estimation biases. In addition, the MTT dependence of CBF accuracy raises doubts of the validity of adopting a single cross-calibration factor (i.e., setting normal white matter to 22 mL minute(-1) (100 g)(-1)) to obtain CBF values with absolute units. The impact of PVE may be reduced by decreasing the maximum arterial signal drop in the perfusion images. To correct the AIF distortions introduced by PVE, the nonlinear relationship between the impact of PVE on MR signal intensity and contrast concentration function must be considered.