title: Radiation dose of digital tomosynthesis for sinonasal examination: comparison with multi-detector CT.
abstract: OBJECTIVE
  Using an anthropomorphic phantom, we have investigated the feasibility of digital tomosynthesis (DT) of flat-panel detector (FPD) radiography to reduce radiation dose for sinonasal examination compared to multi-detector computed tomography (MDCT).
  
  
  METHODS
  A female Rando phantom was scanned covering frontal to maxillary sinus using the clinically routine protocol by both 64-detector CT (120 kV, 200 mAs, and 1.375-pitch) and DT radiography (80 kV, 1.0 mAs per projection, 60 projections, 40° sweep, and posterior-anterior projections). Glass dosimeters were used to measure the radiation dose to internal organs including the thyroid gland, brain, submandibular gland, and the surface dose at various sites including the eyes during those scans. We compared the radiation dose to those anatomies between both modalities.
  
  
  RESULTS
  In DT radiography, the doses of the thyroid gland, brain, submandibular gland, skin, and eyes were 230 ± 90 μGy, 1770 ± 560 μGy, 1400 ± 80 μGy, 1160 ± 2100 μGy, and 112 ± 6 μGy, respectively. These doses were reduced to approximately 1/5, 1/8, 1/12, 1/17, and 1/290 of the respective MDCT dose.
  
  
  CONCLUSIONS
  For sinonasal examinations, DT radiography enables dramatic reduction in radiation exposure and dose to the head and neck region, particularly to the lens of the eye.
authors.affiliation: Department of Radiology, Tokyo Women's Medical University Medical Center East, 2-1-10 Nishiogu, Arakawa-ku, Tokyo 116-8567, Japan. machira@dnh.twmu.ac.jp
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Machida
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Yuhara
authors.forename: Mieko
authors.initials: M
authors.lastname: Tamura
authors.forename: Tomokazu
authors.initials: T
authors.lastname: Numano
authors.forename: Shinji
authors.initials: S
authors.lastname: Abe
authors.forename: John M
authors.initials: JM
authors.lastname: Sabol
authors.forename: Shigeru
authors.initials: S
authors.lastname: Suzuki
authors.forename: Eiko
authors.initials: E
authors.lastname: Ueno
mesh_terms: D005240:Feasibility Studies; D006801:Humans; D010256:Paranasal Sinuses / Q000000981:diagnostic imaging*; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000379:methods*; D036542:Tomography, Spiral Computed / Q000379:methods*