Congress:
EuroSafe Imaging 2020
Keywords:
Performed at one institution, Experimental, Not applicable, Quality assurance, Education, Diagnostic procedure, CT, Radioprotection / Radiation dose, Professional issues, Abdomen, Action 3 - Image quality assessment based on clinical indications
Authors:
A. Fedusenko, M. Takha, O. Nikitina, V. Novokhatchenko
DOI:
10.26044/esi2020/ESI-05471
Description of activity and work performed
Predominant part of CT examinations in our institution are abdomen and thorax-abdomen-pelvis multiphasic scans. We have been using Siemens Somatom go.Up CT machine equipped with SAFIRE statistical iterative reconstruction for two years.
In our institution different SAFIRE strengths (levels of iteration) were compared to filtered back projection (FBP) algorithm scanning patients with conventional kV (110) and Quality Reference mAs (120) options (Tab.1). Than in 122 patients with normal weight (body mass index between 18.5 and 24.9) we gradually reduced tube parameters and selected proper SAFIRE strength to maximally decrease radiation exposure trying to obtain still diagnostically satisfactory images. Furthermore, IR allowed us to decrease radiation in different phases to varying degrees. Thus, in native and excretory series kV 110 and Quality Reference mAs 80 are used, while in venous phase tube parameters rise up to 130 and 98 respectively because it’s spatial and contrast resolution is crucial in diagnostic process (Tab.2). As a result, we have achieved a dose reduction up to 30%.
Fig.1 and 2 demonstrate noise reduction in low dose imaging using IR algorithm. Fig.3 shows that scans of the same diagnostic quality may be achieved with far less radiation exposure.