Coder calibrating device of digital radiology photography system

Abstract

The invention discloses a coder calibrating device of a digital radiology photography system, comprising a coder and a gear which is coaxial with the coder. The coder calibrating device is characterized by also comprising a light shielding sheet, a groove type photoelectric switch and a control module, wherein the light shielding sheet is arranged on the edge of the gear; the groove type photoelectric switch is arranged on a fixed plate; a position of the light shielding sheet, which is opposite to the groove type photoelectric switch, enables the light shielding sheet to cross a groove of thegroove type photoelectric switch when rotating; and the control module is respectively connected with the groove type photoelectric switch and the coder, stores the number of opposite original pointpulses of the coder and the number of current pulses of the coder, and resets the number of the current pulses of the coder by utilizing the number of the opposite original point pulses of the coder when receiving a signal of the groove type photoelectric switch.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to a digital radiography system encoder calibration device. Background technique [0002] figure 1 Shown is a suspension frame digital radiography system. When the suspension frame structure digital radiography system is working, the patient lies on the radiography bed (lying position), adjusts the relative position between the detector and the tube beam optical device assembly, so that the patient is on the vertical line between the focus of the tube and the center of the detector , or the patient stands between the radiography bed and the tube beam assembly (upright position), adjust the relative position between the detector and the tube beam assembly, so that the patient is on the vertical line between the focus of the tube and the center of the detector, that is, the chest In this way, the X-ray rays emitted from the ball tube pass through the patient's lesion after...

AI Technical Summary

Problems solved by technology

[0004] During photography, the angle control of the detector’s rotational movement is a key factor affecting the image quality. The feedback element of the digital radiography system with a suspension frame structure uses an incremental rotary encoder 8. Compared with the traditional potentiometer, the incremental rotation The output of encoder 8 is a differential digital pulse signal, which has strong anti-interference ability and long transmission distance, but the origin of the incremental rotary encoder is not fixed, and only a relative origin is set by software when starting up. Vibration, incremental rotary encoder 8 often produces false pulses, so after a period of running time, the origin set by the software will be offset due to accumulated errors, which affects the precise control of the detector's rotational motion angle , thereby affecting the quality of the image

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