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首页> 外文期刊>Radiology >Focal liver lesions: characterization with conventional spin-echo versus fast spin-echo T2-weighted MR imaging.
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Focal liver lesions: characterization with conventional spin-echo versus fast spin-echo T2-weighted MR imaging.

机译：局灶性肝脏病变：常规自旋回波与快速自旋回波T2加权MR成像的特征。

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PURPOSE: To compare prospectively the diagnostic accuracy of T2-weighted conventional spin-echo (SE) and fast SE magnetic resonance (MR) imaging for differentiation of benign (hemangiomas or cysts) from malignant (metastases or hepatocellular carcinoma) liver lesions. MATERIALS AND METHODS: Fifty-three patients with 55 confirmed liver lesions (20 hemangiomas, eight cysts, 22 metastases, four hepatocellular carcinomas, one malignant fibrous histiocytoma) underwent T2-weighted conventional SE (repetition time msec/echo time [TE] msec = 3,100/ 80,160) and fast SE (5,000-5,000/99-104 [effective TE]) MR imaging at 1.5 T. The images were evaluated quantitatively (lesion-liver signal intensity ratio and lesion T2 index [SIlesion TE80/SIlesion TE160, where SI = signal intensity] and qualitatively (blinded reading) by using receiver operating characteristic analysis. RESULTS: Quantitatively, the T2 index (Az = .988) was more accurate than the signal intensity ratio at conventional SE (Az = .920) and fast SE (Az= .910) imaging (P < .05). Qualitatively, there was no statistically significant difference between the blinded reading of conventional SE (Az = .988) and fast SE (Az = .986) images in lesion characterization (benign vs malignant). There was a trend, however, toward superiority of conventional SE imaging for evaluation of "hypervascular" metastases (n = 9). CONCLUSION: With the specific parameters used, conventional SE and fast SE images provide equal accuracy for characterization of focal liver lesions. In patients with hypervascular metastases, double-echo conventional SE images may be preferable.
机译：目的：前瞻性地比较T2加权常规自旋回波（SE）和快速SE磁共振（MR）成像对良性（血管瘤或囊肿）与恶性（转移性或肝细胞癌）肝脏病变的区分。材料与方法：53例确诊的肝病患者（55例肝血管瘤，8个囊肿，22个转移灶，4例肝细胞癌，1例恶性纤维组织细胞瘤）接受了T2加权常规SE（重复时间msec /回声时间[TE] msec = 3,100 / 80,160）和1.5 T的快速SE（5,000-5,000 / 99-104 [有效TE]）MR成像。对图像进行定量评估（病变-肝脏信号强度比和病变T2指数[SIlesion TE80 / SIlesion TE160，其中结果：从数量上看，T2指数（Az = .988）比常规SE（Az = .920）时的信号强度比更准确，且速度更快SE（Az = .910）成像（P <.05）。定性地，在病变特征描述中，常规SE（Az = .988）和快速SE（Az = .986）图像的盲读之间无统计学显着性差异（良性与恶性）。但是，对于评估“超血管”转移的常规SE成像的优势（n = 9）。结论：使用所使用的特定参数，常规SE和快速SE图像在表征局灶性肝病灶方面具有相同的准确性。在有血管转移的患者中，首选双回波常规SE图像。

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