ASSESSMENT AND USE OF NEW ULTRASONIC TECHNOLOGIES

多普勒超声的新模式和接收信号的新调理 音速谱允许准确地评估 心内血流。彩色编码，二维多普勒允许 整体流场速度的定性和定量评价 模式。利用这些技术的研究包括：(1) 纽芬兰犬主动脉瓣下狭窄模型的定量研究(2) 超声多普勒法与激光多普勒法的比较(3)研究 心内分流的超声心动图；(4)彩色多普勒超声心动图 二尖瓣；以及(5)二尖瓣梗阻和返流的定量 带和不带假体的右室-肺动脉导管 价值观。对患者的研究，包括术中和术后， 已经开始对瓣膜病变的手术进行评估 和先天性心脏缺陷。

New modes of Doppler ultrasound and new signal conditioning of the received sonic specta permit accurate assessment of mean and peak 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) Quantitation of gradients in Newfoundland dogs with subaortic stenosis; (2) Comparison of ultrasound Doppler with laser Doppler anemometry; (3) Studies of intracardiac shunt flow; (4) Doppler color flow mapping of prosthetic mitral valves; and (5) Quantitation of obstruction and regurgitation in right ventricular to pulmonary arter conduits with and without prosthetic values. Studies in patients, both intraoperatively and postoperatively, have been initiated for the assessment of operations for valvular lesions and congenital cardiac defects.