Effective Dose for Patient in Multimode Panoramic Radiography.
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Accession number;99A0737866
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| Title;Effective Dose for Patient in Multimode Panoramic Radiography. |
| Author;
YASAKI SHIRO
(Ohu Univ., Sch. of Dent.)
DAIBOU MOTOJI
(Ohu Univ., Sch. of Dent.)
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Journal Title;Dental Radiology
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Journal Code:Z0608B
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ISSN:0389-9705
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VOL.39;NO.2;PAGE.113-121(1999)
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| Figure&Table&Reference;TBL.7, REF.15 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;In recent years, multimode panoramic radiography has had various functions, such as the auto exposure function, auto focus function (auto function), TMJ radiography and tomogram radiography functions. The Purpose of this study was to estimate the effective dose for patients in each mode of the new multimode panoramic radiography. (J. MORITA MFG. CORP. Dental Panorama X-ray Apparatus: Veraview Scope X600) The absorbed doses in important organs involved in the causation of stochastic effects were measured by a thermoluminescent dosimeter using RANDO phantom. The effective doses were calculated using modified tissue weighting factors recommended by the International Commission on Radiological Protection(ICRP) in 1990. The mean field size over skin in typical panoramic and tomographic examinations was about 3% and 0.4% of the total body surface area of 15000cm2. Assuming that the incidence of skin cancer is proportional to the area of skin exposed to ionizing radiation, the tissue weighting factor of skin can be estimated to be about 0.0003 and 0.00004. The estimate in effective dose was lower (5.3.MU.Sv) in the panoramic auto function mode (an average exposure condition of 69kV 7mA) than that (6.5-13.8.MU.Sv) in the linear tomogram modes. Since the linear tomogram mode requires a scout view, such as standard panoramic radiography, the dose in the linear tomogram mode becomes higher than other modes. A percentage of gonad doses in effective doses was negligible. (author abst.) |
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