Radiation dose of digital tomosynthesis for sinonasal examination: Comparison with multi-detector CT

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• 作者：Haruhiko Machida^a ; ^{machira@dnh.twmu.ac.jp} ; Toshiyuki Yuhara^a ; Mieko Tamura^a ; Tomokazu Numano^b ; Shinji Abe^b ; John M. Sabol^c ; Shigeru Suzuki^d ; Eiko Ueno^a
• 关键词：Computed tomography ; Digital tomosynthesis ; Paranasal sinuses ; Radiation dosage ; Radiography ; X-ray tomography
• 刊名：European Journal of Radiology
• 出版年：2012
• 期刊代码：93_0720048x
• 类别：med
• 出版时间：June, 2012
• 卷：81
• 期：6
• 页码：1140-1145
• 文件大小：654 K

摘要

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 mA s, and 1.375-pitch) and DT radiography (80 kV, 1.0 mA s per projection, 60 projections, 40掳 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 卤 90 渭Gy, 1770 卤 560 渭Gy, 1400 卤 80 渭Gy, 1160 卤 2100 渭Gy, and 112 卤 6 渭Gy, 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.