[Appearance of low intensity band seen around the abdominal organs on gradient echo image]

To clarify the mechanism of appearance of low intensity band seen around the abdominal organ, we performed phantom study. The resected intestine, which filled with water and fixed in the salad oil, was obtained by spoiled GRASS MR imaging with variable TEs and fixed TR. On in phase image, low intensity band was seen in low frequency side of frequency encoding direction of surface of the intestine, and high intensity band in high frequency side. On out of phase image, low intensity band is seen all around the intestine. Our phantom study verified that the appearance of low intensity band on out of phase gradient echo image is due to both the misregistration and signal void caused by chemical shift artifact.