ASSESSMENT AND USE OF NEW ULTRASONIC TECHNOLOGIES

多普勒超声的新模式和接收的新信号调节 声谱允许准确评估心内血流速度 血流 彩色编码，二维多普勒允许定性和 整个流场速度模式的定量评价。 研究 利用这些技术包括：1）多普勒 临床和临床前的体内和体外速度/流量标测 人工二尖瓣; 2）体内多普勒超声与 体外多普勒超声和激光多普勒风速仪; 3）评估 二尖瓣返流; 4）定量阻塞和返流， 右心室至肺动脉管道。 在患者中进行的研究， 术中和术后，已开始评估 瓣膜病变的手术。

New modes of Doppler ultrasound and new signal conditioning of the received sonic spectra permit accurate assessments of velocities of intracardiac blood flow. Color-encoded, two-dimensional Doppler permits qualitative and quantitative evaluations of entire flow field velocity patterns. Studies utilizing these technologies include the following: 1) Doppler velocity/flow mapping in vivo and in vitro of clinical and preclinical prosthetic mitral valves; 2) comparison of in vivo Doppler ultrasound with in vitro Doppler ultrasound and laser Doppler anemometry; 3) assessment of mitral regurgitation; 4) quantitation of obstruction and regurgitation in right ventricular to pulmonary artery conduits. Studies in patients, both intraoperatively and postoperatively, have been initiated for assessment of operations for valvular lesions.