Semelka R C, Shoenut J P, Kroeker R M
St Boniface General Hospital, University of Manitoba, Winnipeg, Canada.
J Magn Reson Imaging. 1993 Mar-Apr;3(2):323-7. doi: 10.1002/jmri.1880030206.
The authors prospectively compared four T2-weighted magnetic resonance (MR) sequences, including high-resolution 512 x 512 (matrix size) RARE (rapid acquisition with relaxation enhancement), 256 x 256 RARE, 128 x 256 breath-hold RARE, and 192 x 256 fat-suppressed spin-echo (T2FS) sequences, in the evaluation of 16 patients with focal hepatic masses. MR images were evaluated by quantitative lesion-liver signal difference-to-noise ratios (SDNRs) and subjective evaluation of image artifact and image quality. No significant differences were observed between RARE sequences in SDNR values. The T2FS sequence had a significantly higher SDNR than the 512 x 512 RARE sequence (24.6 +/- 15.0 vs 14.5 +/- 9.7) (P = .008). Image quality was rated highest for the 512 x 512 RARE and T2FS sequences (P = .006). The inherent advantage of high spatial resolution suggests that the 512 x 512 RARE sequence may be of value in detecting hepatic lesions.
作者前瞻性地比较了四种T2加权磁共振（MR）序列，包括高分辨率512×512（矩阵大小）RARE（弛豫增强快速采集）、256×256 RARE、128×256屏气RARE和192×256脂肪抑制自旋回波（T2FS）序列，用于评估16例肝脏局灶性肿块患者。通过定量病变-肝脏信号差异与噪声比（SDNRs）以及对图像伪影和图像质量的主观评估来评价MR图像。在SDNR值方面，RARE序列之间未观察到显著差异。T2FS序列的SDNR显著高于512×512 RARE序列（24.6±15.0对14.5±9.7）（P = 0.008）。512×512 RARE和T2FS序列的图像质量评分最高（P = 0.006）。高空间分辨率的固有优势表明，512×512 RARE序列在检测肝脏病变方面可能具有价值。
