title: Investigation of absorbed radiation dose in refraction-enhanced breast tomosynthesis by a Laue case analyser.
abstract: An early diagnosis system for breast cancer using refraction-enhanced breast tomosynthesis is under development. Tomograms of breast specimens based on refraction-contrast were demonstrated using the simplest shift-and-add tomosynthesis algorithm. Raw projection image data of breast specimens for tomosynthesis were acquired for a total of 51 views over an angle of 50°, in increments of 1°, by rotating the object. The incident X ray was monochromatic synchrotron radiation with 20 keV. The purpose of this study was to estimate the absorbed dose of a new X-ray imaging method. As breast cancer almost always arises in glandular breast tissue, the average absorbed dose in such glandular tissue should be measured to estimate the radiation risk associated with mammography. The absorbed dose of the mammary gland due to monochromatic X rays was calculated by the Monte Carlo method, and the optimal X ray energy range for refraction-enhanced breast tomosynthesis was investigated through actual measurements. Compared with the conventional method, it was found to be below one-sixth per inspection.
authors.affiliation: Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2 Ami, Inashiki, Ibaraki 300-0394, Japan. satoh@ipu.ac.jp
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Sato
authors.forename: Masami
authors.initials: M
authors.lastname: Ando
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shimao
mesh_terms: D000465:Algorithms; D001940:Breast / Q000503:physiopathology*; D001943:Breast Neoplasms / Q000175:diagnosis; D003198:Computer Simulation; D003952:Diagnostic Imaging; D005260:Female; D006801:Humans; D008327:Mammography; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D012031:Refractometry; D014057:Tomography, X-Ray Computed