AI Article Synopsis
- This study explores the potential of a breast-positioning (BP) technique to reduce breast radiation doses during thoracic CT exams, utilizing organ-based tube current modulation (OTCM).
- 13 female anthropomorphic computational phantoms were created to simulate different breast sizes, and the effectiveness of various CT protocols was evaluated using a Monte Carlo program for dose estimation.
- Results showed that OTCM with the BP technique significantly reduced breast dose by an average of 38.6% compared to traditional methods, with larger breast sizes experiencing even greater reductions, while also decreasing exposure to the thymus and heart.
Article Abstract
Purpose: This study aimed to investigate the breast dose reduction potential of a breast-positioning (BP) technique for thoracic CT examinations with organ-based tube current modulation (OTCM).
Methods: This study included 13 female anthropomorphic computational phantoms (XCAT, age range: 27-65 y.o., weight range: 52-105.8 kg). Each phantom was modified to simulate three breast sizes in standard supine geometry. The modeled breasts were then morphed to emulate BP that constrained the majority of the breast tissue inside the 120° anterior tube current (mA) reduction zone. The OTCM mA value was modeled using a ray-tracing program, which reduced the mA to 20% in the anterior region with a corresponding increase to the posterior region. The organ doses were estimated by a validated Monte Carlo program for a typical clinical CT system (SOMATOM Definition Flash, Siemens Healthcare). The simulated organ doses and organ doses normalized by CTDI were used to compare three CT protocols: attenuation-based tube current modulation (ATCM), OTCM, and OTCM with BP (OTCM ).
Results: On average, compared to ATCM, OTCM reduced breast dose by 19.3 ± 4.5%, whereas OTCM reduced breast dose by 38.6 ± 8.1% (an additional 23.8 ± 9.4%). The dose saving of OTCM was more significant for larger breasts (on average 33, 38, and 44% reduction for 0.5, 1, and 2 kg breasts, respectively). Compared to ATCM, OTCM also reduced thymus and heart dose by 15.1 ± 7.4% and 15.9 ± 6.2% respectively.
Conclusions: In thoracic CT examinations, OTCM with a breast-positioning technique can markedly reduce unnecessary exposure to radiosensitive organs in anterior chest wall, specifically breast tissue. The breast dose reduction is more notable for women with larger breasts.
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| http://dx.doi.org/10.1002/mp.12076 | DOI Listing |
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