Adaptive iterative dose reduction (AIDR) 3D in low dose CT abdomen-pelvis: Effects on image quality and radiation exposure

10th International Seminar on Medical Physics; 1st AMDI International Oncology Symposium

物理学;医药卫生

Ang, W.C.^1 ; Hashim, S.^1,2 ; Karim, M.K.A.^1,3 ; Bahruddin, N.A.^1 ; Salehhon, N.^1 ; Musa, Y.^1

Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, Skudai, Johor

81310, Malaysia^1

Centre for Sustainable Nanomaterials (CSNano), Ibnu Sina Institute for Scientific and Industrial Research (ISI-SIR), Universiti Teknologi Malaysia, UTM Skudai, Johor

81310, Malaysia^2

Department of Diagnostic Imaging, National Cancer Institute, Precint 7, Putrajaya

62250, Malaysia^3

关键词: 3D reconstruction;    Fbp reconstruction;    Filtered back projection;    Hounsfield units;    Radiation Exposure;    Region of interest;    Standard deviation;    Subjective image quality;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/851/1/012006/pdf
DOI  :  10.1088/1742-6596/851/1/012006

学科分类：卫生学

来源: IOP

【 摘 要 】

The widespread use of computed tomography (CT) has increased the medical radiation exposure and cancer risk. We aimed to evaluate the impact of AIDR 3D in CT abdomen-pelvic examinations based on image quality and radiation dose in low dose (LD) setting compared to standard dose (STD) with filtered back projection (FBP) reconstruction. We retrospectively reviewed the images of 40 patients who underwent CT abdomen-pelvic using a 80 slice CT scanner. Group 1 patients (n=20, mean age 41 ± 17 years) were performed at LD with AIDR 3D reconstruction and Group 2 patients (n=20, mean age 52 ± 21 years) were scanned with STD using FBP reconstruction. Objective image noise was assessed by region of interest (ROI) measurements in the liver and aorta as standard deviation (SD) of the attenuation value (Hounsfield Unit, HU) while subjective image quality was evaluated by two radiologists. Statistical analysis was used to compare the scan length, CT dose index volume (CTDIvol) and image quality of both patient groups. Although both groups have similar mean scan length, the CTDIvolsignificantly decreased by 38% in LD CT compared to STD CT (p