Chinese Physics C > 2014, Vol. 38 > Issue(3): 038201 DOI: 10.1088/1674-1137/38/3/038201

Experimental measurement of radiation dose in a dedicated breast CT system

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Abstract：
Radiation dose is an important performance indicator of a dedicated breast CT (DBCT). In this paper, the method of putting thermoluminescent dosimeters (TLD) into a breast shaped PMMA phantom to study the dose distribution in breasts was improved by using smaller TLDs and a new half-ellipsoid PMMA phantom. Then the weighted CT dose index (CTDI _w) was introduced to average glandular assessment in DBCT for the first time and two measurement modes were proposed for different sizes of breasts. The dose deviations caused by using cylindrical phantoms were simulated using the Monte Carlo method and a set of correction factors were calculated. The results of the confirmatory measurement with a cylindrical phantom (11 cm/8 cm) show that CTDI _wgives a relatively conservative overestimate of the average glandular dose comparing to the results of Monte Carlo simulation and TLDs measurement. But with better practicability and stability, the CTDI _wis suitable for dose evaluations in daily clinical practice. Both of the TLDs and CTDI _wmeasurements demonstrate that the radiation dose of our DBCT system is lower than conventional two-view mammography.
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SHEN Shan-Wei, WANG Yan-Fang, SHU Hang, TANG Xiao, WEI Cun-Feng, SONG Yu-Shou, SHI Rong-Jian and WEI Long. Experimental measurement of radiation dose in a dedicated breast CT system[J]. Chinese Physics C, 2014, 38(3): 038201. doi: 10.1088/1674-1137/38/3/038201

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Received: 2013-04-22
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Experimental measurement of radiation dose in a dedicated breast CT system

Corresponding author:SHEN Shan-Wei,

Received Date:2013-04-22
Accepted Date:1900-01-01
Available Online:2014-03-05

Abstract:Radiation dose is an important performance indicator of a dedicated breast CT (DBCT). In this paper, the method of putting thermoluminescent dosimeters (TLD) into a breast shaped PMMA phantom to study the dose distribution in breasts was improved by using smaller TLDs and a new half-ellipsoid PMMA phantom. Then the weighted CT dose index (CTDI_w) was introduced to average glandular assessment in DBCT for the first time and two measurement modes were proposed for different sizes of breasts. The dose deviations caused by using cylindrical phantoms were simulated using the Monte Carlo method and a set of correction factors were calculated. The results of the confirmatory measurement with a cylindrical phantom (11 cm/8 cm) show that CTDI_wgives a relatively conservative overestimate of the average glandular dose comparing to the results of Monte Carlo simulation and TLDs measurement. But with better practicability and stability, the CTDI_wis suitable for dose evaluations in daily clinical practice. Both of the TLDs and CTDI_wmeasurements demonstrate that the radiation dose of our DBCT system is lower than conventional two-view mammography.