STUDI IN VIVO SHIELDING SILICON RUBBER DAN TIMBAL (SR-PB) PADA PEMERIKSAAN COMPUTED TOMOGRAPHY (CT) OBJEK AYAM

Abstract

Computed Tomography (CT) produces excellent images when diagnosing patient abnormalities. However, the dose received by some radiation-sensitive organs is a significant concern. This study aims to evaluate the reduction in Hounsfield Unit (HU) values and the resulting image quality of a composite-based shielding consisting of silicon rubber (SR) and lead (Pb), comparing it to whole-body chicken images without shielding during CT examination of the abdomen. Exposure factor by type of abdominal protocols with a voltage of 70 kV, 19 mAs, CTDIvol 0.35 mGy, and DLP 18.8 mGy.cm.The synthetic SR-Pb shield had Pb percentages ranging from 0 to 5 wt% and a thickness of 0.6 cm. Scanning on the chicken's abdomen was performed with and without the SR-Pb shield placed directly on the abdomen surface. The HU values were analyzed using MicroDicom software. Image quality was assessed based on the consistency of HU values in the object's anterior, posterior, and lateral areas. A detailed evaluation of image quality was conducted using image subtraction techniques. The study found that the HU values for specific organs did not tend to increase significantly with an increase in the Pb percentage in the SR-Pb shield. The use of the SR-Pb shield had a minor impact on the resulting images, and image quality was well-maintained for every anatomical part. Application of SR in CT examination with precise image results and HU value of each white matter 79-93 HU, liver 86-111 HU, ribs 1032-1189 HU, wing bones 391-531 HU, upper femur 1512 – 1746 HU. In conclusion, the study demonstrates that the resulting images are high quality without artifacts in chicken images, even at higher Pb percentages. Keywords: shielding, silicon rubber, CT Examination.