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CT effective dose per dose length product using ICRP 103 weighting factors.
Med Phys. 2011 Mar; 38(3):1261-5.MP

Abstract

PURPOSE

To generate effective dose per unit dose length product (E/DLP) conversion factors incorporating ICRP Publication 103 tissue weighting factors.

METHODS

Effective doses for CT examinations were obtained using the IMPACT Dosimetry Calculator using all 23 dose data sets that are offered by this spreadsheet. CT examinations were simulated for scans performed along the patient long axis for each dosimetry data set using a 4 cm beam width ranging from the upper thighs to top of the head. Five basic body regions (head, neck, chest, abdomen, and pelvis), as well as combinations of the regions (head/neck, chest/abdomen, abdomen/ pelvis, and chest/abdomen/pelvis) and whole body CT scans were investigated. Correction factors were generated that can be applied to convert E/DLP conversion factors based on ICRP 60 data to conversion factors that are valid for ICRP 103 data (i.e., E103/E60).

RESULTS

Use of ICRP 103 weighting factors increase effective doses for head scans by approximately 11%, for chest scans by approximately 20%, and decrease effective doses for pelvis scans by approximately 25%. Current E/DLP conversion factors are estimated to be 2.4 microSv/mGy cm for head CT examinations and range between 14 and 20 microSv/mGy cm for body CT examinations.

CONCLUSIONS

Factors that enable patient CT doses to be adjusted to account for ICRP 103 tissue weighting factors are provided, which result in E/DLP factors that were increased in head and chest CT, reduced in pelvis CT, and showed no marked change in neck and abdomen CT.

Authors+Show Affiliations

Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina 29425, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21520838

Citation

Huda, Walter, et al. "CT Effective Dose Per Dose Length Product Using ICRP 103 Weighting Factors." Medical Physics, vol. 38, no. 3, 2011, pp. 1261-5.
Huda W, Magill D, He W. CT effective dose per dose length product using ICRP 103 weighting factors. Med Phys. 2011;38(3):1261-5.
Huda, W., Magill, D., & He, W. (2011). CT effective dose per dose length product using ICRP 103 weighting factors. Medical Physics, 38(3), 1261-5.
Huda W, Magill D, He W. CT Effective Dose Per Dose Length Product Using ICRP 103 Weighting Factors. Med Phys. 2011;38(3):1261-5. PubMed PMID: 21520838.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - CT effective dose per dose length product using ICRP 103 weighting factors. AU - Huda,Walter, AU - Magill,Dennise, AU - He,Wenjun, PY - 2011/4/28/entrez PY - 2011/4/28/pubmed PY - 2011/5/19/medline SP - 1261 EP - 5 JF - Medical physics JO - Med Phys VL - 38 IS - 3 N2 - PURPOSE: To generate effective dose per unit dose length product (E/DLP) conversion factors incorporating ICRP Publication 103 tissue weighting factors. METHODS: Effective doses for CT examinations were obtained using the IMPACT Dosimetry Calculator using all 23 dose data sets that are offered by this spreadsheet. CT examinations were simulated for scans performed along the patient long axis for each dosimetry data set using a 4 cm beam width ranging from the upper thighs to top of the head. Five basic body regions (head, neck, chest, abdomen, and pelvis), as well as combinations of the regions (head/neck, chest/abdomen, abdomen/ pelvis, and chest/abdomen/pelvis) and whole body CT scans were investigated. Correction factors were generated that can be applied to convert E/DLP conversion factors based on ICRP 60 data to conversion factors that are valid for ICRP 103 data (i.e., E103/E60). RESULTS: Use of ICRP 103 weighting factors increase effective doses for head scans by approximately 11%, for chest scans by approximately 20%, and decrease effective doses for pelvis scans by approximately 25%. Current E/DLP conversion factors are estimated to be 2.4 microSv/mGy cm for head CT examinations and range between 14 and 20 microSv/mGy cm for body CT examinations. CONCLUSIONS: Factors that enable patient CT doses to be adjusted to account for ICRP 103 tissue weighting factors are provided, which result in E/DLP factors that were increased in head and chest CT, reduced in pelvis CT, and showed no marked change in neck and abdomen CT. SN - 0094-2405 UR - https://www.unboundmedicine.com/medline/citation/21520838/CT_effective_dose_per_dose_length_product_using_ICRP_103_weighting_factors_ L2 - https://doi.org/10.1118/1.3544350 DB - PRIME DP - Unbound Medicine ER -