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. 2020 Jun 24;188(3):322-331.
doi: 10.1093/rpd/ncz290.

SPOT REGION OF INTEREST IMAGING: A NOVEL FUNCTIONALITY AIMED AT X-RAY DOSE REDUCTION IN NEUROINTERVENTIONAL PROCEDURES

Ljubisa Borota  1 , Andreas Patz  2
Affiliations

SPOT REGION OF INTEREST IMAGING: A NOVEL FUNCTIONALITY AIMED AT X-RAY DOSE REDUCTION IN NEUROINTERVENTIONAL PROCEDURES

Ljubisa Borota et al. Radiat Prot Dosimetry. .

Abstract

Aim of the study: The aim of this study was to describe a new functionality aimed at X-ray dose reduction, referred to as spot region of interest (Spot ROI) and to compare it with existing dose-saving functionalities, spot fluoroscopy (Spot F), and conventional collimation (CC).

Material and methods: Dose area product, air kerma, and peak skin dose were measured for Spot ROI, Spot F, and CC in three different fields of view (FOVs) 20 × 20 cm, 15 × 15 cm, and 11 × 11 cm using an anthropomorphic head phantom RS-230T. The exposure sequence was 5 min of pulsed fluoroscopy (7.5 pulses per s) followed by 7× digital subtraction angiography (DSA) runs with 30 frames per DSA acquisition (3 fps × 10 s). The collimation in Spot F and CC was adjusted such that the size of the anatomical area exposed was as large as the Spot ROI area in each FOV.

Results: The results for all FOVs were the following: for the fluoroscopy, all measured parameters for Spot ROI and Spot F were lower than corresponding values for CC. For DSA and DSA plus fluoroscopy, all measured parameters for Spot ROI were lower than corresponding parameters for Spot F and CC.

Conclusion: Spot ROI is a promising dose-saving technology that can be applied in fluoroscopy and acquisition. The biggest benefit of Spot ROI is its ability to keep the entire FOV information always visible.

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Figures

Figure 1
Figure 1
(a–c) Spot ROI. The brighter square in the center indicates the ROI exposed with a normal dose. The darker surrounding area indicates the area with additional attenuation of 0.7 mm Cu; (d–f) Spot F. The white frame in the center indicates the ROI exposed. Surrounding area is shielded by collimation with LIH superimposed; (g–i) CC
Figure 2
Figure 2
(a–c) Spot ROI. Blue transparent area illustrates the ABC sensing area adaptation—not visible in reality. (a) Spot ROI in center position; (b and c) Spot ROI in off-center position; (d–f) Spot F; white frame delineates the collimation applied. The LIH is superimposed over the collimator blades. Blue transparent area illustrates the ABC sensing area adaptation—not visible in reality. (d) Spot F with centric and symmetric collimation. (e and f) Spot F with acentric, asymmetric collimation
Figure 3
Figure 3
C-arm with an anthropomorphic RS-230T head phantom placed on the table
See this image and copyright information in PMC

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