Comparison of image quality between conventional VIBE and radial VIBE in free-breathing paediatric abdominal MRI

- Modulation of motion artifact during MRI is important, especially in children.
- Motion artifact can be reduced effectively using radial k-space sampling method.
- We compared image quality of radial and conventional VIBE in pediatric abdominal MRI.
- Radial VIBE showed superior image quality in young children while free-breathing.

AimTo compare the image quality between conventional volume interpolated breath-hold examination (VIBE) and radial VIBE in contrast-enhanced fat-suppressed T1-weighted images of paediatric abdominal magnetic resonance imaging (MRI) during free-breathing.Materials and methodsImages from paediatric patients who underwent contrast-enhanced abdominal MRI with a 3 T magnet using conventional VIBE (conventional group) and radial VIBE (radial group) while freely breathing were reviewed retrospectively. For objective analysis, the mean values of noise and signal-to-noise ratio (SNR) in the liver on contrast-enhanced fat-suppressed T1-weighted images were compared. For subjective analysis, overall image quality, respiratory motion, portal vein clarity, and hepatic margin sharpness were assessed using four-point scales.ResultsNine patients (mean age of 2.8±2.3 years) in the conventional and 17 patients (mean age of 2.4±2.8 years) in the radial groups were included. According to the objective analysis, the noise was significantly lower and the SNR was significantly higher in the radial group than those in the conventional group (all, p<0.001). In the subjective analysis, overall image quality, respiratory motion, portal vein clarity, and hepatic margin sharpness were all significantly higher in the radial group (all, p<0.001).ConclusionPaediatric abdominal MRI images with radial VIBE showed lower noise with higher SNR in objective analysis and higher image quality in subjective analysis, compared to conventional VIBE.