Yamashita Y, Torashima M, Hatanaka Y, Harada M, Sakamoto Y, Takahashi M, Miyazaki K, Okamura H
Department of Radiology, Kumamoto University School of Medicine, Japan.
Radiology. 1994 Jun;191(3):759-64. doi: 10.1148/radiology.191.3.8184059.
To assess the value of phase-shift gradient-echo magnetic resonance (MR) imaging with the fast low-angle shot (FLASH) technique in the differentiation of hemorrhagic tumors and teratomas.
T1- and T2-weighted spin-echo imaging and phase-shift MR imaging were performed in 60 patients. On T1-weighted images, the signal intensity of lesions was compared with that of intraperitoneal fat. Findings at MR imaging were compared with the surgical findings. The diagnostic performance of each pulse sequence was analyzed with receiver operating characteristic curves.
Sixty high-signal-intensity lesions were identified in 45 patients at T1-weighted imaging. Hemorrhagic lesions and teratomas had similar signal intensities on both T1- and T2-weighted images. Lesions were detected more decisively with FLASH imaging than with T1- and T2-weighted imaging.
Phase-shift gradient-echo imaging is a readily available method for the differential diagnosis of lesions with high signal intensity at T1-weighted MR imaging.
评估采用快速低角度激发（FLASH）技术的相移梯度回波磁共振（MR）成像在鉴别出血性肿瘤和畸胎瘤中的价值。
对60例患者进行了T1加权和T2加权自旋回波成像以及相移MR成像。在T1加权图像上，将病变的信号强度与腹膜内脂肪的信号强度进行比较。将MR成像的结果与手术结果进行比较。采用受试者操作特征曲线分析每个脉冲序列的诊断性能。
在45例患者的T1加权成像中发现了60个高信号强度病变。出血性病变和畸胎瘤在T1加权和T2加权图像上具有相似的信号强度。与T1加权和T2加权成像相比，FLASH成像能更明确地检测到病变。
相移梯度回波成像是一种用于鉴别T1加权MR成像中高信号强度病变的简便方法。
