Variation of Image Quality and Dose by Applying Multi-Leaf Collimator for Digital Mammography

디지털 유방촬영장치에서 다엽 조리개 적용으로 인한 화질과 선량의 변화

Kwon, Soon Mu;Kim, Boo Soon;Park, Hyung Jun;Kang, Yeong Han

  • Received : 2015.11.17
  • Accepted : 2015.12.25
  • Published : 2015.12.31


Collimator has important functions with control primary X-ray that decrease radiation exposure dose for patients and reduce scatter ray and make better quality of image. But there are no regulations for X-ray mammography device of collimator, so widely used device adopt rectangularly controlled collimator. Though digital X-ray mammography device expand supply recently, rectangularly controlled collimator of film/screen mode still used. After searching for real condition of beam field with digital mammography, we made a multi-leaf collimator which is able to adjust the beam field in accordance with size and shape of breast, and we measuring up the transitions of image quality, average glandular dose(AGD) and, Dose area product(DAP). There are no significant differences between rectangularly controlled collimator and multi-leaf collimator, and DAP value decreased by 50.72%. As conclusion, there needs to expand the use of multi-leaf collimator for optimum adoption of beam field in digital mammography, and also need to develop an automatic regulation of beam field for reduce of exposure dose to patients.


digital mammography;collimator;dose area product;radiation dose;image quality


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