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
Conclusion and recommendations
The Figure 2 shows a comparison between the areas of visibility obtained by the RMI 1151 phantom for the three fluoroscopy modalities using the objective method for the calculation of the contrast C.
The values of limit spatial resolution and contrast threshold were 0.58 mm and 4.3% in High Fluoroscopy (the highest dose modality),
1.6 mm and 7.5 % in Normal Fluoroscopy (the medium dose modality) and 2.4 mm and 11.3%,
in Low Fluoroscopy (the low dose modality).
The quality-image parameters obtained in high modality were considerably improved with respect to,
a normal modality,
while they were significantly reduced for the low modality.
The evaluations of incident air kerma showed a reduction of about 20% between high and normal modalities and of about -3%.between low and normal fluoroscopy.
These kerma variations between normal,
high and low modalities are also conserved for the equivalent doses to critical organs for the two procedures,
as shown in Table 1.
The interventional radiologist can choose to use three different fluoroscopy modalities according to the quality image needs evaluating the dosimetric values also based on the exposure time.
Low fluoroscopy,
with 3% dose reduction compared to normal,
provides a much worse image quality parameters,
as shown in Table 1.
Therefore,
low fluoroscopy can be used to verify the correct vessels closure,
i.e.
in post-embolization controls of the uterine artery where a high image quality is not required.
Normal fluoroscopy can represent a good compromise between dose and image quality and it is recommended in a routine use.
High fluoroscopy,
thanks to its extreme spatial resolution (0.58 mm),
can be used for the catheterization of small vessels where the increase in the dose could be compensated by a reduction of irradiation time due to a better visibility of the vessels.