The study of the response characteristics of DR flat panel detectors has the following meanings:
(1) Pay attention to the improvement of detection sensitivity. The digital image processing technology can deal with a series of problems such as blur and noise in the DR image, and it is easier to find the defect information existing in the noise, and continuously improve the detection sensitivity.
(2) Reduce the dose and improve the detection efficiency. If you can get a clear image with high noise and scattering, you can reduce the dose required for color shooting. In industry, the lower the dose, the higher the safety, and the maximum detection of DR rays. The thickness has increased.
In the DR system, the integration time is extremely short, and the concept of exposure in the film exposure curve has no practical significance in DR. By replacing the exposure with the tube voltage, the integration time is 200ms. When the image with the gray value of 23000 is obtained by different tube currents, the relationship between the tube voltage and the thickness is obtained. By observing, the relationship between the tube voltage and the thickness is very intuitive. As the tube current increases, the slope of the tube voltage and the thickness characteristic curve decreases accordingly.
In the use of DR detection system, it is important to study the response characteristics of flat panel detectors to different energy and intensity X-rays, which can greatly improve the imaging quality and assist in selecting the optimal radiation dose.
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