The Application Of Research In The Metrology Test Of Detecive Quantun Efficiency In Medical X-RAY Photography System

The Digital X-ray photography system(Digital Radiography,DR)is the enormous breakthrough technology progress since the invention of CT X ray radiation imaging,with the excellent image quality,abundant function,rapid working efficiency and the safety of the low exposure dose which the intensifying screen film imaging system and the regular X-ray photography system cannot compare to.The current of digital X-ray photography system measurement test method and analysis method are relatively backward which is lack of objective evaluation methods to evaluate the relationship between the X-ray dose and the output image,so it cannot ensure the safety of the medical treatment of the patients.This research is focus on to design the corresponding mold,the Detective Quantum Efficiency test method and software.This research can also evaluate the digital X-ray photography measurement performance by the application of detective quantum efficiency which can establish digital X-ray photography system measurement standard device.The detective quantum efficiency of two-edged tungsten test mold can obtain the X and Y direction from an imaging modulation transfer function which compare with the traditional single edged tungsten mold improve the efficiency.By established the detective quantum efficiency test methods can satisfy the data services requirements of the detective quantum efficiency which laid the foundation of clinical quality control.By established the scale of tiny doses of radiation field which create the condition of the output of the system for the medical digital X-ray photography dose calibration.Eventually we will establish the digital X-ray photography system measurement standard to provide the objective support legality,rationality legitimacy for the medical institution which in use of X-ray.In addition,this research can effectively reduce the probability of the false positives and false negatives and the influence of the artificial factor,meanwhile it provide reliable basis for doctor's diagnosis and provide an objective evaluation method on the basis for the patients.