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Radiation Protection Dosimetry 82:271-276 (1999)
© 1999 Oxford University Press

Dose Evaluation and Effective Dose Estimation in Radiological Studies of Paranasal Sinuses

K. Nishizawa, A. Yoshino-Tonari, M. Matsumoto, C. Aoki and J. Hachiya

Computed tomography (CT) examinations prior to endoscopic paranasal surgery are tending to increase as spatial resolution improves. Since the patient dose from CT is higher than conventional paranasal sinus imaging techniques, it is worthwhile comparing doses due to typical pre-operative radiographic examinations. The exposure doses to various organs or tissues using three types of sinography were measured, namely (1) plain films for Waters' and a lateral view, (2) conventional tomography, and (3) CT with 3 mm and 5 mm slice thickness. The measurements were performed under conditions that were as close as possible to clinical examinations. From the measured data, the effective doses were estimated. It was determined that the dose to the eye lens from a CT examination with a 5 mm slice thickness was about 100 times higher than that from conventional examinations. The surface dose from a CT examination with a 5 mm slice thickness was 2-10 times higher than that from conventional examinations.


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