一种基于射线质测量辐射剂量的放射照相方法。

A radiographic method for measuring radiation dose based on beam quality.

作者信息

Syriopoulos K, Velders X L, Geraets W G, van der Stelt P F

机构信息

Department of Oral Radiology, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.

出版信息

Dentomaxillofac Radiol. 1998 Sep;27(5):287-92. doi: 10.1038/sj/dmfr/4600376.

DOI:10.1038/sj/dmfr/4600376

PMID:9879218

Abstract

OBJECTIVES

To develop a radiographic method for measuring radiation dose based on beam quality for inexpensive postal surveys of general dental practitioners.

METHODS

Different beam qualities were simulated to expose a commercially available film (X-Omat MA 18 x 22.4 cm, Ready Pack, Kodak Pathe, Paris, France). Density and contrast curves were fitted by means of 4th-degree polynomial functions. The curves were used to estimate beam quality (as the first HVL) and radiation dose in air for 22 different dental X-ray machines by means of linear interpolation. These estimations were compared with the measurements obtained with the NERO system and an ionization chamber (paired t-test).

RESULTS

No significant differences were found between the radiographic and the conventional methods in determining beam quality and radiation dose.

CONCLUSIONS

The radiographic method can be used to determine beam quality and radiation dose of dental X-ray machines from a single exposure. The radiographic method is simple and inexpensive and causes a minimum of disruption to the dental practice.

摘要

目的

开发一种基于射线质测量辐射剂量的放射照相方法，用于对普通牙科医生进行低成本的邮寄调查。

方法

模拟不同的射线质以照射一种市售胶片（X-Omat MA 18×22.4 cm，Ready Pack，柯达Pathé，法国巴黎）。通过四次多项式函数拟合密度和对比度曲线。利用这些曲线通过线性插值估计22台不同牙科X射线机的射线质（作为首个半价层）和空气中的辐射剂量。将这些估计值与使用NERO系统和电离室获得的测量值进行比较（配对t检验）。