Low dose protocol for high resolution CT thorax: influence of matrix size and tube voltage on image quality and radiation dose

Background: High-resolution CT (HRCT) thorax has increase demand due to its advantage in diagnosing chronic respiratory diseases. The feasibility of matrix size with different tube voltage the HRCT protocol is unknown. Therefore, this study aimed compare effect sizes and on image quality radiation dose adult thorax. Methods: A Phantom experiment was performed, followed by a patient scan. For phantom scan, total six protocols two settings, 120 kVp 100 kVp, combination three sizes, 512, 768, 1024 were used. In study, 180 patients who had scan considered. Dose data collected, quantitative analysis performed drawing region interests acquired images. Qualitative independently blinded radiologists. Results: report revealed that 100kVp selected delivered 15.64% 15.62% less terms volumetric computed tomography index (CTDIvol) length product (DLP), respectively, compared 120kVp settings sizes. Similarly, for population, CTDIvol DLP difference noted statistically significant (p<0.001). quality, also among settings. mean score subjective assessment greater than 4.5 diagnostic acceptability streak artefacts. Conclusion: result suggests 512 X preferable Lung achieve optimal reduction almost 40% techniques.