Rowan D, McKenzie A L, McNee S G, Glen E S
Br J Urol. 1977 Aug;49(4):285-91. doi: 10.1111/j.1464-410x.1977.tb04138.x.
This investigation reveals that there is a marked reduction in the rotational speed of the transducer disc as the stream flowrate is increased, although the non-linearity is partly reduced by electronic compensation within the instrument. The inaccuracy at low flowrates is probably unimportant in routine clinical applications. However, significant errors are recorded at high flowrates when the stream strikes the grid intersections or when the point of impact is close to the edge of the rotating disc. For these reasons, it is desirable that the patient should avoid micturating directly on to the grid. To obtain acceptable clinical recordings, an instrument time constant of 0-5 sec must be used. Although some characteristic tracings can be identified, the clinical measurements indicate that the effects of the volume voided and stream movement must be taken into consideration when the flow patterns are being interpreted.
本研究表明，随着液流流速增加，换能器盘的转速显著降低，尽管仪器内部的电子补偿部分降低了非线性。低流速时的不准确性在常规临床应用中可能并不重要。然而，当液流撞击网格交叉点或撞击点靠近旋转盘边缘时，在高流速下会记录到显著误差。由于这些原因，患者应避免直接对着网格排尿。为获得可接受的临床记录，必须使用0 - 5秒的仪器时间常数。尽管可以识别出一些特征性描记图，但临床测量表明，在解释流速模式时，必须考虑排尿量和液流移动的影响。
