| Summary: | A digital X-ray radiography system has been developed along with the image processing software �DRImager� at the Gadjah Mada University. �DRImager� has image enhancement capability directly for the image from a digital X-ray radiography system. Several image quality parameters was measured prior and after image enhancement process and then those compared to each other to see the changes or improvement on the physical measurement of the image. Three kinds of image quality parameter were measured. First, spatial resolutions described in three physical quantities Full Width at Half Maximum (FWHM), Contrast Transfer Function (CTF), and Modulation Transfer Function (MTF). Second, noises described in Noise Power Spectrum (NPS), Signal to Noise Ratio (SNR), and Contrast to Noise Ratio (CNR). Third, attenuation described as changes in attenuation coefficient. As a result, image processing done by �DRImager� unaltered the spatial resolutions, while it reduced the noise level very significant. The NPS showed the noise level decreased after image processing, thus the SNR value was increased by 157.52% and the CNR value was increased by 179.58%. Third, the attenuation coefficient of Aluminium step wedge before and after image processing was relatively constant at 0.11 mm-1. So the image processing done by �DRImager� was able to maintan the spatial resolutions and the attenuation coefficient, while it reduced the noise level.
|
|---|