Analisa Variasi Faktor Eksposi Terhadap Nilai Exposure Index pada Pemeriksaan Radiografi Pelvis

Abstract

Background: The Exposure Index is a quantitative parameter used in digital radiography systems to indicate the level of radiation exposure received by the detector. Pelvic examinations involve a relatively large and dense area of the body, requiring a higher radiation dose than other areas to produce clear diagnostic images. The exposure index value helps determine whether the exposure is sufficient, insufficient, or excessive. The purpose of this study was to determine the appropriate exposure factor range (kV and mAs) to obtain an exposure index value in computed radiography, specifically for pelvic radiography examinations.
Methods: This research is quantitative with an experimental approach. The object of study was a body phantom. Data were collected by performing pelvic radiographic exposures using varying kV and mAs (kV: 75, 77, 80, 85, 90 and mAs: 12, 14, 16, 18, and 20) and measuring the exposure index values of the pelvic radiographs. Data were then analyzed using statistical tests.
Results: The results showed that kV had a very strong correlation with EI (r = 0.843; p < 0.01), while mAs had a moderate correlation (r = 0.502; p < 0.05). Regression analysis revealed that kV and mAs simultaneously had a significant effect on EI (p < 0.05), with kV as the most dominant factor.
Conclusions: The exposure factors kV and mAs significantly influence the Exposure Index (EI) value in computed radiography of the pelvis. The influence of kV on EI is more dominant than mAs, so kV settings are the primary factor in controlling EI, while mAs acts as an additional adjustment.