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Comparison of ultrafast half‐Fourier single‐shot turbo spin‐echo sequence with turbo spin‐echo sequences for T2‐weighted imaging of the female pelvis
Author(s) -
Yamashita Yasuyuki,
Tang Yi,
Abe Yasuko,
Mitsuzaki Katsuhiko,
Takahashi Matsumasa
Publication year - 1998
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.1880080605
Subject(s) - fast spin echo , sequence (biology) , turbo , medicine , spin echo , single shot , nuclear magnetic resonance , image quality , nuclear medicine , pulse sequence , magnetic resonance imaging , radiology , physics , optics , chemistry , computer science , artificial intelligence , biochemistry , automotive engineering , engineering , image (mathematics)
So that we might evaluate the ultrafast half‐Fourier single‐shot turbo spin‐echo (HASTE) sequence in T2‐weighted MRI of the female pelvis and compare it with the turbo spin‐echo (TSE) sequence, we prospectively studied 60 consecutive females with suspected abnormalities of the pelvis. For all MR examinations, we used a 1.5‐T superconductive magnet with a phased array coil. The HASTE sequence was applied with TR/effective TE/echo train = ∞/90/64 and a 128 × 256 matri× (acquisition time: .3 sec/slice), conventional TSE imaging with 3,400 to 5,000/132/15 and a 128 × 256 matri× (mean acquisition time: 2 min 4 sec), and high‐resolution TSE imaging with 3,400 to 5,000/132/15 and a 300 × 512 matri× (6 min 4 sec). Although the lesion conspicuity for the HASTE sequence was less than that for the high‐resolution TSE sequences, artifacts (including ghosting, bowel motion, susceptibility difference, and chemical shift) were negligible on HASTE images of all patients. The lesion conspicuity for the HASTE sequence was significantly better than for the conventional TSE sequence. In spite of the very short acquisition time, the subjective scoring of the overall image quality for the HASTE sequence was significantly higher than for the conventional TSE sequence ( P < .01) and were slightly lower than for the high‐resolution TSE sequence. Compared with high‐resolution TSE, HASTE provided clearer visualization of large leiomyomas and ovarian tumors but slightly poorer visualization of uterine cancer. In occlusion, HASTE sequence generates higher contrast and is free from motion and chemical shift artifact with much higher time efficacy. Because of limited image resolution, the HASTE sequence should be used when the high‐resolution TSE imaging is suboptimal.