Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
Oral and maxillofacial radiologyComparative dosimetry of dental CBCT devices and 64-slice CT for oral and maxillofacial radiology
Section snippets
Materials and Methods
Doses for the following CBCT units were investigated: NewTom 3G (QR, Verona, Italy); CB Mercuray (Hitachi Medical of America, Twinsburg, OH); Promax 3D (Planmeca OY, Helsinki, Finnland); Prexion 3D (Terarecon, San Mateo, CA); Galileos (Sirona, Charlotte, NC); Classic i-CAT (Imaging Sciences International, Hatfield, PA); Next Generation i-CAT (Imaging Sciences International); and Iluma (Imtec Imaging, Ardmore, OK). Dose for the 64-slice MDCT was measured using the Somatom Sensation
Results
Table V provides equivalent doses for the weighted tissues and organs that receive direct exposure during maxillofacial imaging. Two dosimeter runs on the same Next Generation iCAT unit in landscape mode were available. The mean dosimeter exposure for each run was found to vary by less than 2%. An average of the values from the 2 runs is presented in table V. It is noteworthy that salivary gland contribution to effective doses range from 1 mSv to more than 17 mSv depending on the radiographic
Discussion
Revision of tissue-weighting factors in the 2007 ICRP recommendations is made possible by the availability of cancer incidence data that was not available when the 1990 guidelines were published. The 1990 ICRP cancer risks were computed based on mortality data. Incidence data provides a more complete description of cancer burden than mortality data alone, particularly for cancers that have a high survival rate. Much of the cancer incidence data comes from the Life Span Study of Japanese atomic
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