T2-weighted MRI of rectosigmoid carcinoma: Comparison of respiratory-triggered fast spin-echo, breathhold fast-recovery fast spin-echo, and breathhold single-shot fast spin-echo sequences

✍ Scribed by Shuhei Yamashita; Takayuki Masui; Motoyuki Katayama; Kimihiko Sato; Nobuko Yoshizawa; Hidekazu Seo; Harumi Sakahara

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 278 KB
• Volume: 25
• Category: Article
• ISSN: 1053-1807
• DOI: 10.1002/jmri.20827

✦ Synopsis

Abstract

Purpose

To compare the abilities of T2‐weighted (T2W) imaging using respiratory‐triggered fast spin‐echo (RT‐FSE), breathhold fast‐recovery FSE (BH‐FRFSE), and BH single‐shot FSE (BH‐SSFSE) sequences without an endorectal coil to detect rectosigmoid carcinomas.

Materials and Methods

Forty patients (stage: pT0, 1; pTis‐2, 15; pT3‐4, 24) were included in the study. All examinations were performed on a 1.5T magnet with a phased‐array coil and the patients were studied in the prone position with per‐anal air injection. Qualitative and quantitative evaluations were performed.

Results

Motion artifact was the most prominent with the RT‐FSE sequence, and the least prominent with the BH‐SSFSE sequence. Scores for depiction of the rectal wall layer, tumor recognition, and overall image quality were the highest with the BH‐FRFSE sequence. On the basis of a receiver operating characteristic (ROC) analysis, the detection rate of tumor invasion through the rectal wall was higher with the BH‐FRFSE sequence (Az = 0.9077) than with the RT‐FSE (Az = 0.7762, p < 0.05) or BH‐SSFSE (Az = 0.8602) sequence. Tumor‐to‐fat contrast was highest with the BH‐FRFSE sequence (P < 0.017).

Conclusion

The BH‐FRFSE sequence may be the first choice for rectosigmoid T2W imaging in the prone position with per‐anal air injection for patients who can hold their breath stably. J. Magn. Reson. Imaging 2007;25:511–516. © 2007 Wiley‐Liss, Inc.