Radial volumetric imaging breath-hold examination (VIBE) with k-space weighted image contrast (KWIC) for dynamic gadoxetic acid (Gd-EOB-DTPA)-enhanced MRI of the liver: advantages over Cartesian VIBE in the arterial phase
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To compare radial volumetric imaging breath-hold examination with k-space weighted image contrast reconstruction (r-VIBE-KWIC) to Cartesian VIBE (c-VIBE) in arterial phase dynamic gadoxetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (DCE-MRI) of the liver.
We reviewed 53 consecutive DCE-MRI studies performed on a 3-T unit using c-VIBE and 53 consecutive cases performed using r-VIBE-KWIC with full-frame image subset (r-VIBEfull) and sub-frame image subsets (r-VIBEsub; temporal resolution, 2.5–3 s). All arterial phase images were scored by two readers on: (1) contrast-enhancement ratio (CER) in the abdominal aorta; (2) scan timing; (3) artefacts; (4) visualisation of the common, right, and left hepatic arteries.
Mean abdominal aortic CERs for c-VIBE, r-VIBEfull, and r-VIBEsub were 3.2, 4.3 and 6.5, respectively. There were significant differences between each group (P < 0.0001). The mean score for c-VIBE was significantly lower than that for r-VIBEfull and r-VIBEsub in all factors except for visualisation of the common hepatic artery (P < 0.05). The mean score of all factors except for scan timing for r-VIBEsub was not significantly different from that for r-VIBEfull.
Radial VIBE-KWIC provides higher image quality than c-VIBE, and r-VIBEsub features high temporal resolution without image degradation in arterial phase DCE-MRI.
• Radial VIBE-KWIC minimised artefact and produced high-quality and high-temporal-resolution images.
• Maximum abdominal aortic enhancement was observed on sub-frame images of r-VIBE-KWIC.
• Using r-VIBE-KWIC, optimal arterial phase images were obtained in over 90 %.
• Using r-VIBE-KWIC, visualisation of the hepatic arteries was improved.
• A two-reader study revealed r-VIBE-KWIC’s advantages over Cartesian VIBE.
KeywordsRadial VIBE k-space weighted image contrast Gd-EOB-DTPA Dynamic contrast-enhanced MRI Liver
Volumetric imaging breath-hold examination
k-space weighted image contrast reconstruction
Dynamic contrast-enhanced magnetic resonance imaging
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