We compared a quasi-static ultrasound elastography technique, referred to as electrode displacement elastography (EDE), with acoustic radiation force impulse imaging (ARFI) for monitoring microwave ablation (MWA) procedures on patients diagnosed with liver neoplasms. Forty-nine patients recruited to this study underwent EDE and ARFI with a Siemens Acuson S2000 system after an MWA procedure. On the basis of visualization results from two observers, the ablated region in ARFI images was recognizable on 20 patients on average in conjunction with B-mode imaging, whereas delineable ablation boundaries could be generated on 4 patients on average. With EDE, the ablated region was delineable on 40 patients on average, with less imaging depth dependence. Study of tissue-mimicking phantoms revealed that the ablation region dimensions measured on EDE and ARFI images were within 8%, whereas the image contrast and contrast-to-noise ratio with EDE was two to three times higher than that obtained with ARFI. This study indicated that EDE provided improved monitoring results for minimally invasive MWA in clinical procedures for liver cancer and metastases.

译文

我们将准静态超声弹性成像技术 (称为电极位移弹性成像 (EDE)) 与声辐射力冲动成像 (ARFI) 进行了比较,以监测诊断为肝肿瘤的患者的微波消融 (MWA) 程序。经过MWA手术后,招募的49名患者使用Siemens Acuson S2000系统接受了EDE和ARFI。根据两名观察者的可视化结果,结合B模式成像,平均可在20例患者中识别ARFI图像中的消融区域,而平均可在4例患者中产生可描绘的消融边界。使用EDE,平均可在40例患者中划定消融区域,且成像深度依赖性较小。对组织模拟体模的研究表明,在EDE和ARFI图像上测量的消融区域尺寸在8% 以内,而EDE的图像对比度和对比度噪声比是ARFI的2至3倍。这项研究表明,EDE在肝癌和转移的临床手术中提供了改进的微创MWA监测结果。

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