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In this study, we analyzed radiation dose and MTF with setting of Ion chamber and changing kVp so that we are able to suggest acquiring optimized diagnostic images and minimizing patient dose. we assumed right lateral decubitus position among chest decubitus projection and set 7 combination of Ion chamber. By changing kVp(100, 110, 120, 130kVp), we exposed x-ray five times respectively and calculated average value after measuring entrance dose. we input the entrance dose value to PCXMC Monte carlo simulation tool and calculated organ dose and effective dose. Then we did physical image evaluation with MTF for the purpose to compare image quality. As a result, the high kVp, entrance dose is reduced. As change of ion chamber, when selecting second ion chamber, both organ dose and effective dose were the lowest. In contrast, selecting first ion chamber was the highest. MTF is superior to set second Ion chamber and using 120 kVp. Consequently, when taking chest right lateral decubitus using Digital radiography, the optimized combination which have both reducing dose efficiently without declining image quality and aquring good qualified image is set 120 kVp and selecting second Ion chamber. ■ keyword :∣Digital Chest Lateral Decubitus∣Ion Chamber∣kVp∣Organ Dose∣Image Quality∣  : 2014 07 17  : 2014 08 25  : 2014 09 02  : , e-mail : hhpark@hanmail.net       Ion chamber         317

Evaluation on Organ Dose and Image Quality by Changing kVp and Ion Chamber Combination while Taking Digital Chest Lateral Decubitus PA Projection