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Organ-based tube current modulation: are women's breasts positioned in the reduced-dose zone?
Stephen Taylor1, Diana E Litmanovich, Maryam Shahrzad
1From the Department of Radiology, Hôpital André Vésale, Montignies-le-Tilleul, Belgium (S.T.); Department of Radiology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Mass (D.E.L., M.S., A.A.B.); Department of Radiology, Hôpital Erasme, Brussels, Belgium (P.A.G.); and Department of Radiology, Epicura-Clinique Louis Caty, Rue Louis Caty 136, B-7331 Baudour, Belgium (D.T.).
Radiology
|August 26, 2014
Summary
Organ-based tube current modulation (OBTCM) in CT scans does not fully cover breast tissue with reduced radiation. Most women have breast tissue in higher radiation zones, limiting OBTCM
Area of Science:
- Medical Imaging
- Radiology
- Radiation Dose Optimization
Background:
- Computed tomography (CT) utilizes organ-based tube current modulation (OBTCM) to reduce radiation dose.
- Understanding breast tissue positioning is crucial for optimizing OBTCM effectiveness.
Purpose of the Study:
- To assess the potential of OBTCM to minimize radiation dose to breast tissue during CT scans.
- To determine breast angular position relative to OBTCM's low- and high-dose zones.
Main Methods:
- Retrospective analysis of thoracic CT scans from 498 women (supine) and 34 women (prone).
- Radiologists determined breast tissue location and boundaries relative to the CT isocenter.
- Correlation of breast tissue location with patient age and thoracic dimensions.
Main Results:
- No women in the supine position had all breast tissue within the OBTCM reduced-dose zone.
- 99% of supine and 82% of prone patients had breast tissue in the increased-dose zone.
- Breast angular position generally exceeded the OBTCM reduced-dose limit.
Conclusions:
- OBTCM's reduced-dose zone is insufficient to cover all breast tissue in most CT examinations.
- Patient positioning and breast anatomy limit the effectiveness of OBTCM for breast dose reduction.
- Further strategies may be needed to ensure comprehensive radiation dose reduction to breast tissue during CT.