Abstract
Excellent performance of the digital detector can generate medical images at a lower dose. However, if a certain level of dose exposure of the sensor detector can generate an image to recognize it.
 In this study, the exposure conditions of the forearm, femur, and ankle joint tests currently used in clinical trials were tested with lower doses. The resolution pattern was analyzed using the Image J program, and the results were obtained by analyzing the Interactive 3D Surface Plot. In addition, by measuring the surface dose and absorbed dose, the digital detector finds the minimum conditions to make an image, and also checks the effect of dose reduction.
 The image of the obtained resolution pattern was analyzed by Plot profile using Image J program. It was confirmed that the gray value width decreased at the same pixel distance as the exposure conditions decreased. Even if the exposure conditions were lowered from step 1 to step 4, which is the standard condition of the forearm test, the resolution showed no difference at 1.4 Lp/mm.
 In the Interactive 3D Surface Plot, as the range of the gray scale lowered the exposure condition, the shape of the surface contours gradually became blurred and the contrast of black and white shades decreased. The resolution from step 1 to step 3, which is the standard condition of the femur bone test, was 1.2 Lp/mm, indicating no difference. Even if the exposure conditions were lowered from step 1 to step 4, which is the standard condition for ankle examination, the resolution showed no difference at 1.4 Lp/mm.
 It is thought that it is necessary to accumulate a lot of data by further subdividing the stage of exposure conditions according to the thickness in more areas.
Highlights
The digital X-ray imaging system has a wider dynamic range and dose linearity compared to the film-sensing system, which reduces the re-shooting rate and achieves a certain level of image quality by adjusting the gray scale
Sinyoung Yu1 ray lead bar phantom is photographed under each stage of exposure conditions to obtain an image
An image is acquired by photographing the X-ray lead bar phantom under exposure conditions at each stage
Summary
The digital X-ray imaging system has a wider dynamic range and dose linearity compared to the film-sensing system, which reduces the re-shooting rate and achieves a certain level of image quality by adjusting the gray scale. The dynamic range in the digital detector can be expressed by the ratio of the maximum and minimum values of the pixel, and is effective only when the absorbed dose of the detector and the pixel value are in a linear relationship (Huda W et al, 1997; Rong, X.J et al, 2000; Floyd, C.E et al, 2001) Owing to this advantage, excessive doses could be used without degrading the image quality, and in turn, a constant image quality could be maintained even at small doses. The amorphous silicon flat plate detector showed a significant reduction in both effective dose and entrance skin dose (ESD) compared to film / screen system and CR system, and the image quality was reduced. It appeared to be more improved than the field (Strotzer, M et al.,1998). Showed a decrease in dose (Strotzer, M et al.,2000; Bergh, B et al.,2000)
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