Emission ct

Abstract

Abstract PURPOSE:To obtain an excellent reconstituted picture by measuring a distance to a body to be detected at any time during the scanning period of a detector and by moving the detector toward or away to the body to be detected according to the distance. CONSTITUTION:A control signal is sent from a data processor 16 to a distance calculating circuit 18 through a distance detection interface 19, and an ultrasonic- wave pulse generating circuit 20 generates a pulse signal V20. Then, the number of clock pulses inputted during a period from the generation point of an ultrasonic wave to the detection point of its reflected wave is counted through an ultrasonic vibrator 21, a piezoelectric element 22, etc., and data V18 which corresponds to the distance between a detector 11 and a detected body 13 is obtained. The data V18 is inputted to a data processor 16 through an interface 19 to calculate the distance on the basis of the relation between two kind of threshold values to output a detector driving mechanism control signal V17, thereby holding the detector 11 at an adequate distance from the detected body 13 through a detector driving mechanism 12. This constitution reconstitutes an excellent picture.

Inventors

• 👤 Akihide Kamiyama

Bibliographic Details