In the present study, our aim was to measure the effective dose to the patient and the eye lens dose using standard FDCT whole-brain imaging with the20 second protocol and compare it to the effective dose of the new 7s faster protocol, standard biphasic FDCT angiography (FDCT-A) and low-dose biphasic FDCT-A and FDCT perfusion (FDCT-P). Effective dose values of analogous MDCT protocols reported previously in the literature were compared with our findings.
Description of activity and work performed
We measured effective dose according to the IRCP 103 (1)using an anthropomorphic phantom equipped with 60 thermoluminescent dosimeters (TLDs). Twelfe TLDs were inserted into the head, while all other relevant organs were covered with at least 4 TLDs.In order to account for variation and to ensure that a dose above the minimal reliable detection level can be recorded, each acquisition was performed ten times. The phantom wasn`t moved during the different acquisition runs. Additionally, we measured dose to the eye lens with 2 TLDs per...
Conclusion and recommendations
Except for the high-dose biphasic FDCT-A protocol, FDCT-applications used in neuroradiology have effective doses, which do not deviate more than one mSv from previously reported values for MDCT applications(2,3). A lower dose per frame can reduce the effective dose of the FDCT-A protocol substantially. However, the effective dose to the eye lens in a standard stroke paradigm exceeds the recommended annual dose by two-folds(4), prompting for strategies to decrease the effective lens dose especially in younger patients.
A. Brehm; Basel/CH - nothing to disclose G. Stamm; Göttingen/DE - nothing to disclose M. Lüpke; Hanover/DE - nothing to disclose B. Stieltjes; Basel/CH - nothing to disclose M.-N. Psychogios; Basel/CH - nothing to disclose
1Strahlenschutzkommission I (2007) Veröffentlichungen der Internationalen Strahlenschutzkommission Deutsche Ausgabe herausgegeben vom Bundesamt für Strahlenschutz
2Lin H-C, Lai T-J, Tseng H-C, et al (2019) Radiation doses with various body weights of phantoms in brain 128-slice MDCT examination. J Radiat Res 60:466–475. https://doi.org/10.1093/jrr/rrz029
3Psychogios M, Schramm P, Frölich AM, et al (2013) Alberta Stroke Program Early CT Scale Evaluation of Multimodal Computed Tomography in Predicting Clinical Outcomes of Stroke Patients Treated With Aspiration Thrombectomy. 2188–2193. https://doi.org/10.1161/STROKEAHA.113.001068
4Dauer LT, Ainsbury EA, Dynlacht J, et al (2017) Guidance on...