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Influence of Adaptive Statistical Iterative Reconstruction (ASIR) algorithm on Dose Reduction and Image Quality in CT Chest with contrast Examination compared with the FBP techniques

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M Isam — Physics Department, Faculty of Science, Mansoura University, Egypt.
A Mokhtar — Radiology Department, Nephrology and Urology Center, Mansoura University, Egypt.
A Abdelrazek — Physics Department, Faculty of Science, Mansoura University, Egypt.
S EL Mogy — Radiology Department, Faculty of Medicine, Mansoura University, Egypt.
A H Oraby — Physics Department, Faculty of Science, Mansoura University, Egypt.
Published 3 Oct 2018 Vol. 6 No. 3 (2018), pp. 167-178 ● Open access
❝ How to cite 🔗 https://doi.org/10.48165/
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Abstract

Presented study aims to estimate the influence of Adaptive Statisti cal Iterative Reconstruction (ASIR) algorithm on dose reduction and  images quality on Computed tomography (CT) Chest with contrast ex amination compared with the traditional Filter back projection tech niques (FBP). Patients were performed by two scanner using two  reconstruction techniques, FBP in 28 patients and ASIR algorithm  in 22 patients. Signal-to-Noise Ratio (SNR) and Contrast-to-Noise  Ratio (CNR) were compared between FBP and ASIR images, CT im ages were tested on different percentage ASIR (0%, 30%, 50%, and  80%). Then, FBP and ASIR images were compared again. Computed  tomography dose index volume (CTDIVOL) and effective doses (EDs)  recorded simultaneously. Images quality parameters were estimated  at the level of the carina in the descending thoracic aorta. Resulting  data assessed by two techniques (FBP, ASIR) were compared statisti cally. The average image quality in FBP was superior to that of ASIR  images. SNR were (16.50±5.91, 7.58±0.81BMI <30) (12.78±8.63,  8.37±3.51, BMI >30), CNR were (11.88±5.60, 5.35±0.94, BMI <30),  (8.85±7.60, 5.39±2.72, BMI >30) for FBP, ASIR respectively. Signifi cant increase in the SNR and CNR was observed with increased per centage of ASIR. ASIR had a statistically significantly (P= 0.048)  lower CTDIvol (9.57±1.08) than the conventional FBP (13.71±3.45),  with the use of ASIR, ED were slight differ compared with FBP, the 

KeywordsASIRFBPCNRSNRBMIDLP

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