American Journal of Roentgenology, Vol 170, 1457-1463, Copyright © 1998 by American Roentgen Ray Society

ARTICLES

MR imaging of the small bowel using the HASTE sequence

JK Lee, HB Marcos and RC Semelka
Department of Radiology, University of North Carolina School of Medicine, Chapel Hill 27599-7510, USA.

OBJECTIVE: To establish the normal MR appearance of small bowel on half- Fourier acquisition single-shot turbo spin-echo (HASTE) sequence and to determine the ability of HASTE to reveal small-bowel disease. MATERIALS AND METHODS: HASTE images in 50 patients without small-bowel disease were reviewed retrospectively to determine the normal MR appearance of small bowel. All patients fasted for at least 6 hr. The images of 18 patients with proven small-bowel abnormalities that were obtained with the HASTE sequence were also reviewed retrospectively by one observer unaware of the findings. The ability to characterize small-bowel diseases using the HASTE sequence was assessed. RESULTS: In the 50 patients with normal small bowel, no fluid was seen in the jejunum and ileum loops in four (8%). Fluid was present in less than 25% of small- bowel loops in 20 patients (40%), 25-50% of small-bowel loops in 20 patients (40%), and 50-75% of small-bowel loops in six patients (12%). Equal amounts of fluid were present in the jejunum and ileum in 30 patients (60%). More fluid was seen in the jejunum than the ileum in 16 patients (32%) and the reverse was true in four patients (8%). The mean diameter of the jejunum was 2.1 cm (SD = 0.34 cm) and of the ileum, 1.9 cm (SD = 0.41 cm). The thickness of the small-bowel wall and valvulae conniventes averaged 2 mm. Findings of dilatation of the bowel lumen and increased thickness of the bowel wall and valvulae conniventes were identified in 18 patients with small-bowel abnormalities. CONCLUSION: The normal and abnormal small bowel can be assessed using the HASTE sequence.
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