Optimization of mAs with iterative reconstruction (IR) on dose reduction and image information (phantom study on CT scan facial bone examination)

Abstract

The effective dose of CT scan of the facial bone is about 20.2 mGy - 42.1 mGy, the radiation dose is influenced by kV, mAs and pitch which are directly proportional to the image quality. When the dose is lowered the noise will increase, so Iterative Reconstruction (IR) is used to reduce noise and radiation doses. There is a dose reduction in the use of mAs and differences in anatomical information with IR on CT Scan Facial Bone examination. This type of research is a quasi-experimental pretest-posttest design with control. The study sample consisted of 5 variations of mAs in the treatment group and 1 control group sample. Measurements were carried out by univariate tests for radiation doses, differences in anatomical image information on variations of mAs with friedman test, followed by post hoc tests. Assessment of anatomical information is done quantitatively by 2 radiologists. There was a decrease in radiation dose between control and treatment groups, a control group the resulting radiation dose mGy 53.66, the lowest dose treatment group 12.56 mGy at 37.5 mAs variations, differences in anatomy image information (p value <0.05 ) treatment and control groups There was a decrease in radiation dose of routine protocols, use of mAs 37.5 on CT Scan of Facial Bone with IR to produce the lowest dose and optimal anatomical information.