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. 2021 Jan 15;193(1):24-36.
doi: 10.1093/rpd/ncab016.

PATIENT-SPECIFIC DOSE ESTIMATES IN DYNAMIC COMPUTED TOMOGRAPHY MYOCARDIAL PERFUSION EXAMINATION

V-M Sundell  1   2 , M Kortesniemi  1 , T Siiskonen  3 , A Kosunen  3 , S Rosendahl  4 , L Büermann  4
Affiliations

PATIENT-SPECIFIC DOSE ESTIMATES IN DYNAMIC COMPUTED TOMOGRAPHY MYOCARDIAL PERFUSION EXAMINATION

V-M Sundell et al. Radiat Prot Dosimetry. .

Abstract

The study aimed to implement realistic source models of a computed tomography (CT) scanner and Monte Carlo simulations to actual patient data and to calculate patient-specific organ and effective dose estimates for patients undergoing dynamic CT myocardial perfusion examinations. Source models including bowtie filter, tube output and x-ray spectra were determined for a dual-source Siemens Somatom Definition Flash scanner. Twenty CT angiography patient datasets were merged with a scaled International Commission on Radiological Protection (ICRP) 110 voxel phantom. Dose simulations were conducted with ImpactMC software. Effective dose estimates varied from 5.0 to 14.6 mSv for the 80 kV spectrum and from 8.9 to 24.7 mSv for the 100 kV spectrum. Significant differences in organ doses and effective doses between patients emphasise the need to use actual patient data merged with matched anthropomorphic anatomy in the dose simulations to achieve a reasonable level of accuracy in the dose estimation procedure.

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Figures

Figure 1
Figure 1
Projection image of the modified ICRP 110 voxel phantom
Figure 2
Figure 2
Schematic axial slice image of patient in different preprocessing steps: original image (A), image with removed partial patient support table, (B) image with added patient support table (C) and image with added adipose tissue (D)
Figure 3
Figure 3
Al-equivalent bowtie filter thicknesses with inherent filtering for 80 kV spectrum for tube A and tube B for a Somatom Definition Flash
Figure 4
Figure 4
Simulated absorbed dose distribution with 80 kV spectrum for modified ICRP phantom
See this image and copyright information in PMC

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