Institut für Rechtsmedizin der Universität Bonn, Bonn, Germany.
Int J Legal Med. 2012 Jul;126(4):607-13. doi: 10.1007/s00414-012-0704-8. Epub 2012 May 11.
The conventional analysis of ballistic gelatine is performed by transillumination and scanning of 1-cm-thick slices. Previous research demonstrated the advantages of colour and radio contrast in gelatine for computed tomography (CT). The aim of this study was to determine whether this method could be applied to head models in order to facilitate their examination. Four head models of about 14 cm in diameter were prepared from two acryl hollow spheres and two polypropylene hollow spheres. Acryl paint was mixed with barium meal and sealed in a thin foil bag which was attached to the gelatine-filled sphere which was covered with about 3-mm-thick silicone. The head models were shot at using 9 mm × 19 expanding bullets from 4 m distance. The models were examined via multislice CT. The gelatine core was removed; the bullet track was photographed and cut into consecutive slices which were scanned optically. CT images were processed with Corel Photo-Paint. Optical and radiological images were analysed using the AxioVision software. The disruption of the gelatine within the head model was visualised by extensive distribution of paint up to the end of the finest cracks and fissures and along the whole bullet track. CT imaging with excellent radio contrast in the gelatine cracks caused by the temporary cavity allowed for multiplanar reconstruction. We conclude that the combination of colour contrast in gelatine with contrast material-enhanced CT facilitates accurate measurements in ballistic head models.
传统的弹道凝胶分析是通过对 1 厘米厚的切片进行透射光和扫描来进行的。先前的研究表明，凝胶中的颜色和放射性对比在计算机断层扫描（CT）中具有优势。本研究的目的是确定这种方法是否可以应用于头部模型，以方便检查。从两个丙烯空心球和两个聚丙烯空心球制备了四个直径约 14 厘米的头部模型。丙烯漆与钡餐混合并密封在一个薄箔袋中，该箔袋附着在充满凝胶的球上，并用约 3 毫米厚的硅酮覆盖。使用 9 毫米×19 毫米的扩张弹从 4 米的距离射击模型。通过多层 CT 检查模型。去除凝胶核；拍摄子弹轨迹并切成连续切片，然后进行光学扫描。使用 Corel Photo-Paint 处理 CT 图像。使用 AxioVision 软件分析光学和放射学图像。通过将油漆广泛分布到最细的裂缝和裂隙的末端以及整个子弹轨迹，在头部模型中的凝胶内破坏可视化。由于临时腔引起的凝胶裂缝中的出色放射对比度的 CT 成像允许进行多平面重建。我们得出结论，凝胶中的颜色对比与对比增强 CT 的结合，可在弹道头部模型中进行准确测量。
