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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). MATERIALS AND 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. CONCLUSION: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.

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Machida H,Yuhara T,Tamura M,Numano T,Abe S,Sabol JM,Suzuki S,Ueno E

doi

10.1016/j.ejrad.2011.03.064

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

1140-5

issue

6

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(11)00336-6

journal_volume

81

pub_type

杂志文章

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