engleski

Quality of chest X-ray images compressed using algorhytms JPEG and JPEG2000

Background: For teleradiology routine X-ray images must be digitized with very high resolution and sent as purely digital files with no quality loss during transmission. The aim of this paper is to compare the quality of digitized chest X-ray images with digitally captured chest X-ray images in children, compressed using popular JPEG and JPEG2000 compression algorithms. Material: Eight upright posteroanterior chest X-ray images were selected for study: four images were photographed using digital camera, and four images were digitaly captured. Each X-ray image was compressed with six different compression degrees (3 bpp, 1.5 bpp, 1 bpp, 0.7 bpp, 0.5 bpp, 0.3 bpp, using JPEG and JPEG2000 algorhytms. Quality of compressed images was evaluated subjectively and by determination of objective measures: SNR, PSNR and MSE. Results: According to physician's subjective evaluation both JPEG and JPEG2000 compression for all X-ray digitized images (all radiologically relevant attributes) were accepted as excellent. PSNR and SNR values in digitaly captured images were lower than PSNR and SNR values in photographed/digitized images in both JPEG and JPEG2000 compression, respectively. There were no statistically significant difference between PSNR values in JPEG and JPEG2000 (p>0.05). Conclusion: To compression degree of 0.3 bpp both compression algorthms can be used for store-and-forward chest X-ray teleradiology.

x-ray; JPEG; JPEG2000; image compression

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