设计：以细胞为观察对象的重复观察测量，对照性体外实验。
DESIGN: Controlled experiment in vitro with repeated observation and measurement based on cells.
目的：评价实时三维超声心动图(RT - 3de)技术在不同形状体外模型容积测量中的准确性和重复性。
Objective: To assess the accuracy and reproducibility of real-time three-dimensional echocardiography (RT-3DE) for measuring the volumes of models with different shape and size ire vitro.
为保证釜体外壁温度和炉膛空气温度的测量精度，采用了优化数字滤波及精度转换电路。
We use optimized digital filter and high accuracy transform circuits to precisely measure the external wall temperature of the autoclave and the air temperature in it.
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