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Study on radiography based on the arbitrarily selected cardiac phases Fumio Kamei 1 1Cardiovascular Division, Sendai Hospital of Japanese National Railways pp.137-143
Published Date 1978/2/15
DOI https://doi.org/10.11477/mf.1404203157
  • Abstract
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Attempt was made to expose X-ray synchronizing with the two arbitrary cardiac phases in a cardiac cycle. For this purpose, first of all, R wave in ECG was converted to saw tooth wave (STW) through bandpass filter, derivative circuit and circuit generating STW. Then, STW was utilized as input signal in circuit selecting cardiac phases.

This electrical circuit mainly consisted of variable resistance and diode. Electric matchingbetween STW and standard voltage was easily obtained by handling with variable resistance.


Copyright © 1978, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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