An Apparatus for Registration of Valve Motion of the Heart by means of Simultaneous Application of Ultrasonic Doppler Method and Pulse Method
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概要
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An examination of the relations between the Doppler signals obtained by the Doppler method and the echo curve obtained by pulse method must be made regarding the same object at the same cardiac cycle. For this reason an apparatus with which the both methods can be applied simultaneously for the same object was produced.<BR>The probe consists of an inner disc-like transducer and an outer surrounding one arranged concentrically. The inner one is for the Doppler method (3Mc), and the outer one for the pulse method (2Mc). The sizes of both transducers are determined to have nearly equal directivity. Since the pulse noise comes into the Doppler set through mechanical and electrical coupling between both transducers, the probe must be so constructed as to be free from couplings between them. The Q's of the Doppler amplifier must be high, in order to reject the pulse noise. The Q's value of this set is more than 100.<BR>The pulse set is the same as an ordinary ultrasonic flaw detector, but echo pulses are displayed on CRT as brightness variation instead of amplitude variation. The peak power and pulse width of ultrasonic pulse were about 0.1 Watt/cm2 and 5 its respectively and the gain of the pulse set was about 90 db.<BR>The Doppler signals and echo curves are recorded, simultaneously but separately on a magnetic tape and on oscillopaper respectively, on both of which tonal burst of 4000 c/s triggered by QRS are superimposed for some time while recording. This enables one to compare and examine both records for the same cardiac cycle.<BR>As a result a good correspondence was found between the Doppler signal and the echo curve of the mitral valve obtained simultaneously ; and so with the tricuspid valve.<BR>When both methods are applied simultaneously, they help one another and the reliability of observation results can be increased.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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