Perbandingan Nilai Index Exposure pada Radiografi Thorax dengan Perubahan Kombinasi Nilai mA dan s Berbeda pada Nilai mAs yang Sama

Angga Yosainto Bequet, Susi Tri Isnoviasih


Background: In CR, there is an indicator called Exposure Index (EI) which displays how much exposure is used for a particular examination. The Exposure Index depends on the exposure factor, the total area of the detector exposed to radiation, and the object being exposed (Bontrager & Lampignano, 2014). One of the exposure factors that is often regulated by the radiographer is mAs. Milliampere seconds (mAs) determine the number of X-rays produced. The purpose of this study was to determine the differences in the Exposure Index Values on Chest Radiography with Changes in the Combination of Different mA and s Values at the Same mAs Value.

Methods: This research is a type of quantitative research with a pre-experimental design. The object of this research is the thorax phantom. Data were collected by exposing thorax the chest phantom, then recording the resulting Exposure Index value. mA and s value variations that are set are 25mA x 320 ms, 160mA x 50 ms and 400mA x 20ms. Data analysis was carried out using statistical tests.

Results: From the statistical test results it is known that there is no significant difference in the Exposure Index Value on Thorax Radiography between the 25mA x 320 ms combination group, the 160mA x 50 ms combination and the 400mA x 20ms combination with a p-value > 0.05 (p-value = 0.151) . The reason for the absence of a difference in the Exposure Index value is the variation in the combination of different mA and s values for the same mAs because with the same mAs, the quantity / intensity value of the X-ray radiation produced is also the same or there is no increase or decrease. With the same x-ray radiation intensity, the radiation received by the Imaging Plate is also the same so that the value of the Exposure index is also the same.

Conclusions: There is no significant difference in the Exposure Index Value on Chest Radiography with Changes in the Combination of Different mA and s Values at the Same mAs Value


Chest Radiography; Computed Radiography; Exposure Index; Radiation Protection; Exposure Factor

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