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Intraindividual comparison of stack-of-stars acquisition for arterial phase imaging with and without breath-holding on dynamic MRI of the liver

Shintaro Ichikawa¹, Utaroh Motosugi², Tetsuya Wakayama³, Satoshi Funayama¹, Daiki Tamada¹, Sagar Mandava⁴, Ty A Cashen⁵, and Hiroshi Onishi¹
¹Department of Radiology, University of Yamanashi, Chuo, Japan, ²Kofu Kyoritsu Hospital, Kofu, Japan, ³GE Healthcare, Hino, Japan, ⁴GE Healthcare, Atlanta, GA, United States, ⁵GE Healthcare, Madison, WI, United States

Adequate scan timing of AP in DISCO-star with routine time frame (12 s/phase) ranged from phase 3 to 5. Although nine patients missed adequate timing, high frame rate reconstruction (3 s/phase) salvaged adequate images.

Fig. 4. Example of the utility of high frame rate reconstruction. Adequate scan timing of arterial phase (AP) was not observed on routine frame reconstruction (12 s/phase). Portal vein (arrowhead) was not enough enhanced in the 3rd phase and hepatic vein (dotted arrow) was already enhanced in the 4th phase. Optimal AP was obtained with high frame rate reconstruction (3 s/phase). Portal vein (arrowhead) was enhanced but the hepatic vein (dotted arrow) was not yet enhanced in the 13th and 14th phase.

Fig. 5. Stacked bar graph representing results of the visual assessment. No respiratory motion/pulsation artifact was observed in DISCO-Star dataset (P < 0.0001). DISCO-Star showed lower score of streak artifact and overall image quality (P < 0.0001). However, there was non-inferiority in the proportion of diagnosable image in DISCO-Star dataset in comparison with DISCO dataset.