A quality control device installed after radiotherapy

Abstract

The invention relates to a quality control device for a radiation afterloading unit. The device detects the positional accuracy of a radiation source extending from the radiation afterloading unit ata dwell point and the timing accuracy of the radiation source at the dwell point. The quality control device for the radiation afterloading unit comprises a camera, a detection catheter and a detection scale. The detection catheter is a transparent catheter. The radiation source enters the detection catheter and reaches the dwell position. The detection scale measures the position of the radiationsource in the detection catheter. The camera acquires the image of the position of the radiation source in the detection catheter. The quality control device for the radiation afterloading unit has the advantages that the camera is used to acquire the image of the radiation source at the dwell point; a detecting person and the detected radiation source can be isolated; the radiation source whichis actually applied is detected and calibrated; a detection result is true, and the quality control effect is reliable; the detection result can be accurately judged and analyzed through the image; the timing precision of the afterloading unit is analyzed through video interception; and the quality control management level of the radiation afterloading unit is improved.

Description

technical field [0001] The invention belongs to radiotherapy equipment, in particular to a quality control device installed after radiotherapy. Background technique [0002] In radiotherapy, the radiotherapy after-installation machine extends the radioactive source along the radioactive source catheter through the radioactive source braid, and reaches the position closest to the lesion. The length of the radioactive source protruding from the radiotherapy after-installation machine needs to be precisely controlled, so that the radioactive source can reach the predetermined position accurately according to the planned design, because the dose contributed by the radioactive source is approximately inversely proportional to the distance, so the distance between the radioactive source and the lesion Small changes in distance can lead to significant changes in radiation dose, and the length of time the radiation source is in place can also cause differences in dose contributions,...

AI Technical Summary

Problems solved by technology

However, the defect of this method is that the accuracy of the calibration cannot be guaranteed, because the detection guide wire is not the radioactive source and radioactive source braid used in the actual radiotherapy after all, and there will inevitably be some errors between the detection results and the actual radiotherapy results.

Another quality control method is to let the real radioactive source push the special scale, wait for the real source to return to the post-installation machine, and read the position where the scale stays. However, due to inertia, the position of the scale is different from that of the source.

Since the effect of radiotherapy is closely related to the extension accuracy of the radiation source, this detection method is obviously not ideal

Images