極短時間露光時のX線特性

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It is a matter of course that a very short time radiography of less than 1/100sec. (10m sec.) is useful for babies and infants as well as for serial Angiocardiography. This has been made possible by the recent progress in sensitive materials. Also, improvements in X-ray apparatuses including the multi-phase device and the single-phase one have achieved an exposure of 1/100sec. or less. The actual X-ray emission durations differ between the single-phase device and the multi-phase one, although the timer indication may be the same on the controller. If the exposure for radiography is rather long, there is no problem, but if the exposure is instantaneous, there arise problems. In the case of the multi-phase device, there is a problem when a high voltage is applied (the initial application), the instantaneous exposure being very difficult. Considering the provisions for the timer (for durations of exposure), the actual X-ray emission time is longer than the indicated time. In the case of the single-phase device, the indicated time and the real exposure time almost agree if several pulses are taken, but if one pulse is considered, there is a big difference between the indicated time (1/120,1/100sec.) and the real exposure time, the latter being considerably shorter. This paper deals with the comparison of X-ray characteristics between the cases involving a single-phase device with one pulse and a multi-phase device with an exposure of 3 msec. so that attention may be called to the significance of the single-phase 1-pulse control system.
1977-09-01

極短時間露光時のX線特性

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