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Estimation and comparison of effective dose (E) in standard chest CT by organ dose measurements and dose-length-product methods and assessment of the influence of CT tube potential (energy dependency) on effective dose in a dual-source CT.
Eur J Radiol. 2012 Apr; 81(4):e507-12.EJ

Abstract

PURPOSE

To determine effective dose (E) during standard chest CT using an organ dose-based and a dose-length-product-based (DLP) approach for four different scan protocols including high-pitch and dual-energy in a dual-source CT scanner of the second generation.

MATERIALS AND METHODS

Organ doses were measured with thermo luminescence dosimeters (TLD) in an anthropomorphic male adult phantom. Further, DLP-based dose estimates were performed by using the standard 0.014mSv/mGycm conversion coefficient k. Examinations were performed on a dual-source CT system (Somatom Definition Flash, Siemens). Four scan protocols were investigated: (1) single-source 120kV, (2) single-source 100kV, (3) high-pitch 120kV, and (4) dual-energy with 100/Sn140kV with equivalent CTDIvol and no automated tube current modulation. E was then determined following recommendations of ICRP publication 103 and 60 and specific k values were derived.

RESULTS

DLP-based estimates differed by 4.5-16.56% and 5.2-15.8% relatively to ICRP 60 and 103, respectively. The derived k factors calculated from TLD measurements were 0.0148, 0.015, 0.0166, and 0.0148 for protocol 1, 2, 3 and 4, respectively. Effective dose estimations by ICRP 103 and 60 for single-energy and dual-energy protocols show a difference of less than 0.04mSv.

CONCLUSION

Estimates of E based on DLP work equally well for single-energy, high-pitch and dual-energy CT examinations. The tube potential definitely affects effective dose in a substantial way. Effective dose estimations by ICRP 103 and 60 for both single-energy and dual-energy examinations differ not more than 0.04mSv.

Authors+Show Affiliations

Department of Diagnostic Radiology, Goethe University-Frankfurt am Main, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany. jijopaul1980@gmail.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

21703793

Citation

Paul, Jijo, et al. "Estimation and Comparison of Effective Dose (E) in Standard Chest CT By Organ Dose Measurements and Dose-length-product Methods and Assessment of the Influence of CT Tube Potential (energy Dependency) On Effective Dose in a Dual-source CT." European Journal of Radiology, vol. 81, no. 4, 2012, pp. e507-12.
Paul J, Banckwitz R, Krauss B, et al. Estimation and comparison of effective dose (E) in standard chest CT by organ dose measurements and dose-length-product methods and assessment of the influence of CT tube potential (energy dependency) on effective dose in a dual-source CT. Eur J Radiol. 2012;81(4):e507-12.
Paul, J., Banckwitz, R., Krauss, B., Vogl, T. J., Maentele, W., & Bauer, R. W. (2012). Estimation and comparison of effective dose (E) in standard chest CT by organ dose measurements and dose-length-product methods and assessment of the influence of CT tube potential (energy dependency) on effective dose in a dual-source CT. European Journal of Radiology, 81(4), e507-12. https://doi.org/10.1016/j.ejrad.2011.06.006
Paul J, et al. Estimation and Comparison of Effective Dose (E) in Standard Chest CT By Organ Dose Measurements and Dose-length-product Methods and Assessment of the Influence of CT Tube Potential (energy Dependency) On Effective Dose in a Dual-source CT. Eur J Radiol. 2012;81(4):e507-12. PubMed PMID: 21703793.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Estimation and comparison of effective dose (E) in standard chest CT by organ dose measurements and dose-length-product methods and assessment of the influence of CT tube potential (energy dependency) on effective dose in a dual-source CT. AU - Paul,Jijo, AU - Banckwitz,Rosemarie, AU - Krauss,Bernhard, AU - Vogl,Thomas J, AU - Maentele,Werner, AU - Bauer,Ralf W, Y1 - 2011/06/23/ PY - 2011/03/25/received PY - 2011/06/01/accepted PY - 2011/6/28/entrez PY - 2011/6/28/pubmed PY - 2012/7/17/medline SP - e507 EP - 12 JF - European journal of radiology JO - Eur J Radiol VL - 81 IS - 4 N2 - PURPOSE: To determine effective dose (E) during standard chest CT using an organ dose-based and a dose-length-product-based (DLP) approach for four different scan protocols including high-pitch and dual-energy in a dual-source CT scanner of the second generation. MATERIALS AND METHODS: Organ doses were measured with thermo luminescence dosimeters (TLD) in an anthropomorphic male adult phantom. Further, DLP-based dose estimates were performed by using the standard 0.014mSv/mGycm conversion coefficient k. Examinations were performed on a dual-source CT system (Somatom Definition Flash, Siemens). Four scan protocols were investigated: (1) single-source 120kV, (2) single-source 100kV, (3) high-pitch 120kV, and (4) dual-energy with 100/Sn140kV with equivalent CTDIvol and no automated tube current modulation. E was then determined following recommendations of ICRP publication 103 and 60 and specific k values were derived. RESULTS: DLP-based estimates differed by 4.5-16.56% and 5.2-15.8% relatively to ICRP 60 and 103, respectively. The derived k factors calculated from TLD measurements were 0.0148, 0.015, 0.0166, and 0.0148 for protocol 1, 2, 3 and 4, respectively. Effective dose estimations by ICRP 103 and 60 for single-energy and dual-energy protocols show a difference of less than 0.04mSv. CONCLUSION: Estimates of E based on DLP work equally well for single-energy, high-pitch and dual-energy CT examinations. The tube potential definitely affects effective dose in a substantial way. Effective dose estimations by ICRP 103 and 60 for both single-energy and dual-energy examinations differ not more than 0.04mSv. SN - 1872-7727 UR - https://www.unboundmedicine.com/medline/citation/21703793/Estimation_and_comparison_of_effective_dose__E__in_standard_chest_CT_by_organ_dose_measurements_and_dose_length_product_methods_and_assessment_of_the_influence_of_CT_tube_potential__energy_dependency__on_effective_dose_in_a_dual_source_CT_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0720-048X(11)00545-6 DB - PRIME DP - Unbound Medicine ER -