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Radiation doses from phantom measurements at high-pitch dual-source computed tomography coronary angiography


Goetti, R; Leschka, S; Boschung, M; Mayer, S; Wyss, C; Stolzmann, P; Frauenfelder, T (2012). Radiation doses from phantom measurements at high-pitch dual-source computed tomography coronary angiography. European Journal of Radiology, 81(4):773-779.

Abstract

OBJECTIVE: To compare radiation doses delivered at prospectively ECG-triggered sequential- (SEQ), retrospectively ECG-gated spiral- (RETRO) and prospectively ECG-triggered high-pitch spiral- (HP) computed tomography coronary angiography (CTCA) protocols, as well as catheter coronary angiography (CCA) using an anthropomorphic phantom. MATERIALS AND METHODS: An anthropomorphic Alderson phantom equipped with 50 thermoluminescent dosimeters (TLDs) was scanned using different CTCA protocols and an uncomplicated diagnostic CCA examination was simulated. Absorbed doses were experimentally determined and effective doses calculated using the dose-length product (DLP) for CTCA and the dose-area product (DAP) for CCA, as well as according to International Commission on Radiation Protection (ICRP) publications 60 and 103. RESULTS: Effective organ doses were significantly lower for HP protocols (100kV: 0.17±0.26mSv; 120kV: 0.26±0.39mSv) compared to SEQ protocols (100kV: 0.50±0.79mSv; 120kV: 0.90±1.41mSv; each p<0.05) and compared to RETRO protocols (100kV: 1.59±2.12mSv; 120kV: 2.75±3.50mSv; each p<0.05). Effective organ doses at HP-CTCA tended to be lower than at CCA (0.37±0.40mSv), however this was not statistically significant (p=0.13). Effective doses calculated according to ICRP guidelines could be estimated using the DLP and a conversion coefficient of k=0.034mSv/[mGycm] (ICRP103) or k=0.028mSv/[mGycm] (ICRP60), respectively. HP-CTCA led to a dose reduction of 89% compared to RETRO-CTCA, regardless of the calculation method used. CONCLUSIONS: Radiation doses as determined by phantom measurements are significantly lower at HP-CTCA compared to SEQ-CTCA and RETRO-CTCA and comparable to uncomplicated diagnostic CCA.

OBJECTIVE: To compare radiation doses delivered at prospectively ECG-triggered sequential- (SEQ), retrospectively ECG-gated spiral- (RETRO) and prospectively ECG-triggered high-pitch spiral- (HP) computed tomography coronary angiography (CTCA) protocols, as well as catheter coronary angiography (CCA) using an anthropomorphic phantom. MATERIALS AND METHODS: An anthropomorphic Alderson phantom equipped with 50 thermoluminescent dosimeters (TLDs) was scanned using different CTCA protocols and an uncomplicated diagnostic CCA examination was simulated. Absorbed doses were experimentally determined and effective doses calculated using the dose-length product (DLP) for CTCA and the dose-area product (DAP) for CCA, as well as according to International Commission on Radiation Protection (ICRP) publications 60 and 103. RESULTS: Effective organ doses were significantly lower for HP protocols (100kV: 0.17±0.26mSv; 120kV: 0.26±0.39mSv) compared to SEQ protocols (100kV: 0.50±0.79mSv; 120kV: 0.90±1.41mSv; each p<0.05) and compared to RETRO protocols (100kV: 1.59±2.12mSv; 120kV: 2.75±3.50mSv; each p<0.05). Effective organ doses at HP-CTCA tended to be lower than at CCA (0.37±0.40mSv), however this was not statistically significant (p=0.13). Effective doses calculated according to ICRP guidelines could be estimated using the DLP and a conversion coefficient of k=0.034mSv/[mGycm] (ICRP103) or k=0.028mSv/[mGycm] (ICRP60), respectively. HP-CTCA led to a dose reduction of 89% compared to RETRO-CTCA, regardless of the calculation method used. CONCLUSIONS: Radiation doses as determined by phantom measurements are significantly lower at HP-CTCA compared to SEQ-CTCA and RETRO-CTCA and comparable to uncomplicated diagnostic CCA.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Diagnostic and Interventional Radiology
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2012
Deposited On:16 Feb 2011 16:30
Last Modified:05 Apr 2016 14:47
Publisher:Elsevier
ISSN:0720-048X
Publisher DOI:10.1016/j.ejrad.2011.01.068
PubMed ID:21310565
Permanent URL: http://doi.org/10.5167/uzh-45826

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