Radiation doses in dental radiology | 合法醫療器材資訊網

Healthprofessionals·0.65to3.7mGyintermsofentrancesurfacekerma,and26to87mGy.cm2intermsofkerma-areaproductforintraoralradiography;·3.3to ...

» Which quantities are used to measure the dose from dental X ray equipment?

Since the effective dose cannot be measures, in practice, other dose quantities that are directly measurable are used for the purpose of optimization, dose monitoring, and quality assurance. They are specific to a certain imaging modality. 

The measurable quantity is the entrance surface air kerma/dose. The unit of entrance surface kerma is the gray (Gy), but in dental radiology the dose levels are usually a small fraction of one gray - milligray (mGy), or even microgray (µGy).

In cephalometric, panoramic radiography and in CBCT the measurable quantity is usually the product of kerma (dose) and the X ray field, called Kerma-area product, measured in mGy.cm2.