The aim of this study is to compare image quality and radiation dose of computed tomography using two different sets of a specific iterative reconstruction called Adaptive Iterative Dose Reduction (AIDR 3D)with a low-dose protocol.

Study design This is a single-center retrospective study and 30 patients (63 years old ±14) who suffer from tumours were enrolled during their follow-up. Acquisition protocol We set the AIDR 3D at its maximum level and we used a low dose protocol (Toshiba Aquilion Prime, Canon Medical System Corporations) with SD (noise amount) set to 15(Group A),while our standard is 11 (Group B). The kVp were 120 for each phase in each protocol. We compared the Dose Lenght Product (DLP) obtained and the radiation effective...

The totalmeanDLP and EDreductionwas 39.95%±10.38 (p value 0.014). The objective analysis results are illustrated in the table. The results from the two reading radiologists showed no significant difference. Limitations The patients examined were only 30 and the contrast medium used were not always the same. Moreover, we didn't assess the BMI for each patient.

Setting the AIDR 3D at its maximum level associating with a low-dose protocol (SD 15) results in a significant dose reduction without compromosing the image quality.

M. Nicolò; Brescia/IT - nothing to disclose M. Di Terlizzi; Brescia/IT - nothing to disclose L. Grazioli; Brescia/IT - nothing to disclose

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