牙科X线摄影期间，牙片长度和形状对暴露组织表面积和体积的影响。

The effects of BID length and shape on the surface area and volume of tissue exposed during dental radiography.

作者信息

Hardman Patrick K, Masood Farah

机构信息

Department of Oral Diagnostic Sciences at the University of Missouri Kansas City, School of Dentistry in Kansas City, MO, USA.

出版信息

J Contemp Dent Pract. 2005 Feb 15;6(1):10-7.

PMID:15719072

Abstract

Using projection geometry, algebraic formulas, and different beam indicating devices (BIDs), the surface area and volume of tissue exposed for a hypothetical patient was determined. Combinations of 4 BID lengths and shapes were used: 4-inch (10.2 cm.) pointed plastic, 8-inch (20.3 cm.) round plastic, 14-inch (35.6 cm.) round aluminum, and 14-inch (35.6 cm.) rectangular aluminum. As each subject BID was progressively lengthened and collimated, the area and volume of tissue exposed was reduced. The calculated area and volume of exposed tissue for the 14-inch rectangular aluminum open-ended lead-lined BID was 16.6 cm.2 and 327.7 cm.3, respectively. This represented 9% of the area and 8% of the volume of tissue exposed using the 4-inch round pointed plastic BID or a 91% (area) and 92% (volume) reduction in patient exposure.

摘要

利用投影几何学、代数公式以及不同的射束指示装置（BIDs），确定了一名假设患者暴露组织的表面积和体积。使用了4种BID长度和形状的组合：4英寸（10.2厘米）尖头塑料、8英寸（20.3厘米）圆形塑料、14英寸（35.6厘米）圆形铝制以及14英寸（35.6厘米）矩形铝制。随着每个受试BID逐渐延长并准直，暴露组织的面积和体积减小。对于14英寸矩形铝制开口铅衬BID，计算出的暴露组织面积和体积分别为16.6平方厘米和327.7立方厘米。这分别占使用4英寸圆形尖头塑料BID时暴露组织面积的9%和体积的8%，即患者暴露面积减少了91%，体积减少了92%。