Is dual-energy computed tomography helpful to determinate the ferromagnetic property of bullets?

I. Diallo , M. Auffret , L. Deloire , C. Saccardy , S. Aho , D. Ben Salem
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引用次数: 5

Abstract

Background

Gunshot injuries are frequent and may result in retained ballistic projectiles or fragments, this is why it is crucial to determinate the ferromagnetic property of retained projectiles if an MRI is considered.

Purpose

The goal of this ex vivo study was to determine if Dual-Energy Computed Tomography (DECT) can discriminate ferromagnetic bullets from non-ferromagnetic bullets.

Material and Methods

Twelve different bullets, placed in the center of the scanner on a gelatin phantom, underwent DECT evaluation. These projectiles were both ancient bullets from the 19Th century (eg. 8 mm 1890 ECP) and recent bullets from the late 20th century (eg. 9 mm Lüger; 7.92 mm Mauser; 7 mm sport carabin). Two independent radiologists who were blinded to the properties of bullets performed all measurement on an external workstation with extended CT scale. Regions of interest (ROI) were placed in the core of each projectile. From these data, a dual-energy index (DEI) was calculated. A bootstrap method with a p value of less than 0.05 was used to demote statistical significance.

Results

Five bullets were ferromagnetic and seven were non-ferromagnetic. The DEI calculated were significantly (p < 0.05) different between the ferromagnetic and non-ferromagnetic projectiles. There were no significant difference (p > 0.05) for intrareader and interreader agreement analysis.

Conclusion

DECT, found a difference between this ferromagnetic and non-ferromagnetic bullets samples using an extended HU, but because of several limitations in this study there is no cut-off DEI value to differentiate these two groups of bullets.

双能计算机断层扫描有助于确定子弹的铁磁特性吗?
背景:枪伤是常见的,可能导致残留的弹道弹丸或碎片,这就是为什么如果考虑MRI,确定残留弹丸的铁磁特性是至关重要的。目的:本离体研究的目的是确定双能计算机断层扫描(DECT)是否可以区分铁磁子弹和非铁磁子弹。材料和方法12颗不同的子弹,放置在扫描仪的中心,在一个明胶模型上,进行了DECT评估。这两种弹丸都是19世纪的古代子弹。8 mm 1890 ECP)和20世纪后期的新子弹(例如。 9毫米鲁格尔手枪;7.92 毫米毛瑟枪;7 毫米运动客舱)。两名独立的放射科医生不知道子弹的性质,他们在一台外部工作站用扩展的CT秤进行了所有的测量。感兴趣区域(ROI)被放置在每个弹丸的核心。根据这些数据,计算了双能量指数(DEI)。采用p值小于0.05的bootstrap方法降低统计学显著性。结果铁磁性子弹5枚,非铁磁性子弹7枚。铁磁弹与非铁磁弹的DEI计算值差异有统计学意义(p < 0.05)。读者内与读者间一致性分析无显著差异(p > 0.05)。结论dect使用扩展HU发现了铁磁性和非铁磁性子弹样品的差异,但由于本研究的一些限制,没有截断DEI值来区分这两组子弹。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Forensic Radiology and Imaging
Journal of Forensic Radiology and Imaging RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
1.70
自引率
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