Congress:
EuroSafe Imaging 2020
Keywords:
Multicentre study, Not applicable, Prospective, Dosimetric comparison, Comparative studies, CT, Radioprotection / Radiation dose, Paediatric
Authors:
K. Khasanova, I. E. Tyurin
DOI:
10.26044/esi2020/ESI-14903
Description of activity and work performed
86 patients were enrolled in this study. Median ED received by patients using 4-phase CT was 30 mSv. In 1-phase CT median ED received by patients was 6,8 mSv.
To assess the diagnostic value of each phase, we introduced an additional criterion - “phase sensitivity”, which characterizes the quality of the resulting image, namely the percentage of changed areas that are visualized without artifact from the contrast agent, with the ability to evaluate size, shape and structure. To evaluate this criterion, seven anatomical areas were identified in each patient.
The “sensitivity” of all scanning phases was compared among themselves for each anatomical region. In total, we analyzed 602 anatomical areas. A 4-phase CT and a single-phase CT (venouse phase) revealed the same number of anatomical areas (n = 267) involved by lymphoma.
In 6 children focal changes in the liver and spleen were not determined on the arterial phase. In 29 patients the artifact from the contrast agent in the subclavian vein limited the evaluation of the adjacent lymph nodes.The number of false negative results of the arterial phase was 35; The “sensitivity” of the arterial phase - 59.3%. Doing one-phase (venouse) CT examination there were no FN results — the sensitivity of the venous phase in the definition of lymphomatous lesions - 100%.