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Dose Reduction in 256-slice Triple Rule-out CT Angiography
Chia-Jung Tsai1; Liang-Kuang Chen2,3; Greta S.P. Mok4,5; Tung-Hsin Wu1; Jason J.S. Lee1
Source PublicationRadiation Measurements

Objective:Triple rule-out (TRO) computed tomographic angiography (CTA) is a protocol which allowsevaluation of coronary arteries, aorta, pulmonary arteries and adjacent intrathoracic structures forpatients with acute chest pain. Retrospective ECG-gated (RGH) is generally used for TRO CTA while thefeasibility of using ECG-gated tube current modulation (ETCM) or prospective ECG-triggering (PGT)protocols have not been fully investigated. The objective of this study is to investigate the potential fordose reduction through the use of ETCM and PGT in TRO CTA examination as compared with routine RGHprotocols.Material and methods:All TRO CTA examinations were performed on a 256-slice CT scanner using ananthropomorphic phantom. To determine equivalent doses for different organs, thermal-luminancedosimeters (TLDs) were placed in different positions in the organs during the scanning and effectivedoses were calculated based on ICRP-103 guidelines. Effective doses calculated from volume CT doseindex (CTDIvol) were also compared with those obtained from TLD measurements.Results:From the study, the mean effective dose for RGH, ETCM and PGT scanning was 21.54 mSv,15.52 mSv and 10.75 mSv respectively. The doses for ETCM and PGT techniques were significantlyreduced by 27% and 50% (p<0.01) as compared to that for RGH. Effective doses calculated from CTDImethod for three protocols were no significantly difference compared with those obtained from TLDmeasurements.Conclusion:Radiation dose could be efficiently reduced by applying the ETCM and PGT protocols in the256-slice TRO CTA examinations.

KeywordTriple Rule-out Cta Retrospectively Ecg-gated Ecg-gated Tube Current Prospectively Ecg-triggering Radiation Dose
Indexed BySCIE
WOS Research AreaNuclear Science & Technology
WOS SubjectNuclear Science & Technology
WOS IDWOS:000300459400175
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Document TypeJournal article
CollectionFaculty of Science and Technology
Faculty of Health Sciences
Corresponding AuthorJason J.S. Lee
Affiliation1.Department of Biomedical Imaging and Radiological Sciences, National Yang Ming University, Taipei, Taiwan, ROC
2.Department of Radiology, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan, ROC
3.College of Medicine, Fu Jen Catholic University, Taipei, Taiwan, ROC
4.Department of Electrical and Electronics Engineering, Faculty of Science and Technology, University of Macau, Macau
5.Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hong Kong
Recommended Citation
GB/T 7714
Chia-Jung Tsai,Liang-Kuang Chen,Greta S.P. Mok,et al. Dose Reduction in 256-slice Triple Rule-out CT Angiography[J]. Radiation Measurements,2011,46(12):2065-2068.
APA Chia-Jung Tsai,Liang-Kuang Chen,Greta S.P. Mok,Tung-Hsin Wu,&Jason J.S. Lee.(2011).Dose Reduction in 256-slice Triple Rule-out CT Angiography.Radiation Measurements,46(12),2065-2068.
MLA Chia-Jung Tsai,et al."Dose Reduction in 256-slice Triple Rule-out CT Angiography".Radiation Measurements 46.12(2011):2065-2068.
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