Bixler R P, Ahrens C R, Rossi R P, Thickman D
Department of Radiology, School of Medicine, University of Colorado Health Sciences Center, Denver 80262.
Radiology. 1991 Feb;178(2):563-7. doi: 10.1148/radiology.178.2.1987625.
The authors provide a simple radiographic method for estimating bullet weight and caliber of both deformed and undeformed bullets that enables accurate determination of caliber for the gamut of bullet shapes, with known degrees of confidence. The weight-determination procedure is based on the correlation between bullet cross-sectional area, as derived from three orthogonal radiographs, and bullet weight, as determined from a data base of the properties of 48 bullets removed from humans. Different equations were developed for bullets weighing 5.8 g or less, or more than 5.8 g. For relatively undeformed bullets an additional method calculated caliber directly from the diameter of the bullet body on radiographs. Both methods enabled correct prediction of the weight and caliber of the bullets; if one method could not be used, results of the other were reliable. Testimony based on these results has been accepted in a local police case and may meet requirements for testimony in U.S. court cases involving gunshots.
作者提供了一种简单的放射成像方法，用于估计变形和未变形子弹的重量和口径，该方法能够在已知置信度的情况下，针对各种子弹形状准确测定口径。重量测定程序基于从三张正交射线照片得出的子弹横截面积与从48颗从人体取出的子弹特性数据库中确定的子弹重量之间的相关性。针对重量为5.8克或以下或超过5.8克的子弹，开发了不同的方程式。对于相对未变形的子弹，另一种方法是直接根据射线照片上子弹主体的直径计算口径。两种方法都能正确预测子弹的重量和口径；如果一种方法无法使用，另一种方法的结果则可靠。基于这些结果的证词已在当地一起警方案件中被接受，并且可能符合美国涉及枪击案法庭案件的证词要求。
