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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
Author(s) -
Yamashita Shuhei,
Masui Takayuki,
Katayama Motoyuki,
Sato Kimihiko,
Yoshizawa Nobuko,
Seo Hidekazu,
Sakahara Harumi
Publication year - 2007
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.20827
Subject(s) - fast spin echo , medicine , nuclear medicine , pulse sequence , sequence (biology) , nuclear magnetic resonance , magnetic resonance imaging , radiology , physics , chemistry , biochemistry
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.