Congress:
EuroSafe Imaging 2020
Keywords:
Performed at one institution, Not applicable, Retrospective, Quality assurance, Education and training, Technology assessment, Technical aspects, Education, CT, Paediatric, Action 3 - Image quality assessment based on clinical indications
Authors:
V. G. Syrgiamiotis, D. T. makri, M. Chasiotou
DOI:
10.26044/esi2020/ESI-08390
Description of activity and work performed
A GE Brightspeed Elite 16 scanner was used in the imaging department at Agia Sofia General paediatric hospital.
A phantom study was performed , in order to assess the effect of ASIR on dose and image quality. To evaluate dose reduction limits , the phantom was scanned in increments of increased Noise index (mA decreasement using AEC ),in balance with ASIR reconstraction to maintain noise equivalence of the 0% ASIR image.
Two hundred and twelve patients from 0,5 to 15 years old 9,1± 4,1 underwent head , chest and abdominal CT examinations , according to PiDRL age and weight based examination protocols , using AEC (Auto mA - smartmA).Retrospecively several ASIR degrees were applied to the same CT data set, such as 0% , 20% , 40% , 60% ,80% and 100% ASIR in order to record CTDIvol values from each set.
Low dose protocols using 60% ASIR for head , (instead of the standard protocol 40%) and 80% ASIR for chest and abdomen (instead of the standard protocols 60%), were used and the effect of high ASIR setting on image quality was studied . The obtained anatomical images were assessed
by two physiacians for diagnostic efficiency scoring in a 4 scale VGA(Visual Grade Analysis)