Dose rate optimization and image quality based relations source image distance (SID) and diagonal flat detector (FD) on catheterization laboratory

Abstract

Interventional Radiology (IR) experiencing very rapid development, this procedure is widely used both in adults and children even in patients with contra indications for surgery. However, this procedure is associated with high radiation risk. This study aims to determine the dose rate optimization and image quality based on the relationship of Source Image Distance (SID) and Diagonal Flat Detector (FD) on catheterizatio n laboratory. The study used 25 cm thick PMMA phantom. From the research , an analysis is carried out to determine the dose
optimization and image quality. Doses rate are measured using a solid state detector while image quality studies are shown with spatial resolution through the Modulation Transfer Function (MTF) analysis. The results showed that the smallest SID was 90 cm, dose rate was 0.119 mGy/s, while the largest SID was 120 cm, dose rate was 0.243 mGy /s, while the diagonal FD variation showed the largest dose rate at FD 15 cm, namely 0.263 mGy/s and the smallest dose rate at 48 cm FD is 0.109 mGy/s. Analysis on the image shows that the largest
spatial resolution was found at SID 105 cm with MTF of 2.69 lp/mm, in diagonal variations FD the largest MTF value was at FD 27 cm with MTF 2.77 lp/mm, so dose optimization and quality optimization The image is shown at SID 105 cm and diagonal FD 27 cm because in these conditions we get a good image quality with a small dose rate.