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Scientific article
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English

Digital phantom versus patient‐specific radiation dosimetry in adult routine thorax CT examinations

Publication date2024-05-22
First online date2024-05-22
Abstract

Purpose

The aim of this study was to compare the organ doses assessed through a digital phantom‐based and a patient specific‐based dosimetric tool in adult routine thorax computed tomography (CT) examinations with reference to physical dose measurements performed in anthropomorphic phantoms.

Methods

Two Monte Carlo based dose calculation tools were used to assess organ doses in routine adult thorax CT examinations. These were a digital phantom‐based dosimetry tool (NCICT, National Cancer Institute, USA) and a patient‐specific individualized dosimetry tool (ImpactMC, CT Imaging GmbH, Germany). Digital phantoms and patients were classified in four groups according to their water equivalent diameter ( D w ). Normalized to volume computed tomography dose index (CTDI vol ), organ dose was assessed for lungs, esophagus, heart, breast, active bone marrow, and skin. Organ doses were compared to measurements performed using thermoluminescent detectors (TLDs) in two physical anthropomorphic phantoms that simulate the average adult individual as a male (Alderson Research Labs, USA) and as a female (ATOM Phantoms, USA).

Results

The average percent difference of NCICT to TLD and ImpactMC to TLD dose measurements across all organs in both sexes was 13% and 6%, respectively. The average ± 1 standard deviation in dose values across all organs with NCICT, ImpactMC, and TLDs was ± 0.06 (mGy/mGy), ± 0.19 (mGy/mGy), and ± 0.13 (mGy/mGy), respectively. Organ doses decreased with increasing D w in both NCICT and ImpactMC.

Conclusion

Organ doses estimated with ImpactMC were in closer agreement to TLDs compared to NCICT. This may be attributed to the inherent property of ImpactMC methodology to generate phantoms that resemble the realistic anatomy of the examined patient as opposed to NCICT methodology that incorporates an anatomical discrepancy between phantoms and patients.

eng
Keywords
  • CT
  • Monte Carlo
  • Digital phantoms
  • Dosimetry
  • Experimental phantoms
Funding
  • European Commission - Radiation risk appraisal for detrimental effects from medical exposure during management of patients with lymphoma or brain tumour [945196]
Citation (ISO format)
PAPADAKIS, Antonios E. et al. Digital phantom versus patient‐specific radiation dosimetry in adult routine thorax CT examinations. In: Journal of applied clinical medical physics, 2024, p. e14389. doi: 10.1002/acm2.14389
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Article (Published version)
Identifiers
ISSN of the journal1526-9914
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Technical informations

Creation05/23/2024 7:22:41 PM
First validation06/18/2024 7:04:15 AM
Update time07/12/2024 11:00:40 PM
Status update07/12/2024 11:00:40 PM
Last indexation07/12/2024 11:00:42 PM
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