Congress:
EuroSafe Imaging 2019
Keywords:
Action 3 - Image quality assessment based on clinical indications, Interventional vascular, Fluoroscopy, Angioscopy, Aneurysms
Authors:
A. Morasca, C. Colosimo, L. Bonomo, A. Mazzini, D. Pasini, P. Polidori, G. Meffe, A. Fidanzio, M. Gentile
DOI:
10.26044/esi2019/ESI-0109
Description of activity and work performed
The evaluation of imaging parameters was performed using a Gammex RMI 1151 Contrast-Detail phantom.
This is constructed of an aluminum plate with a 10 by 10 matrix of holes that vary in diameter (detail) and in depth (contrast).
The images were produced using the arc A of the Siemens ArtisQ biplane angiograph placing the phantom on the MCM4 stand model + D307 Flat Panel and filtering the Rx beam with 1 mm of copper,
as shown in Figure 1.
Three images of the phantom were acquired using High,
Normal and Low fluoroscopy modalities with automatic exposure control (AEC).
The irradiation parameters supplied were voltage equal to 70 kVp for all modalities and currents of 18.4,
15.4 and 14.9 mA respectively.
For the three images the contrast C was evaluated for each phantom’s hole:
C=MPVobject/MPVbkg
Where MPVobject and MPVbkg are the mean pixel values of the object and background signals.
The MPVs were made using the ImageJ Software 1.52a.
Dose evaluations,
performed using the PCXMC software,
were obtained by simulating the use of the fluoroscopic modalities for procedures of:
- · Uterine fibroids embolization;
- · Cerebral aneurysms.
For these procedures the equivalent dose to the critical organs (respectively ovaries and thyroid) and the effective dose were evaluated.