骨测量中计算机x线摄影的准确性:数字成像技术和放大效果的比较

Rachael M. Carew , Mark D. Viner , Gerald Conlogue , Nicholas Márquez-Grant , Sophie Beckett
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引用次数: 17

摘要

骨测量数据可以通过数字成像技术获得,如死后计算机断层扫描(PMCT)和数字x线摄影,无创且无伦理异议。来自PMCT的骨测量数据与直接测量一样准确。数字放射照相比PMCT更容易获得和负担得起,但由于其对象的放大而受到限制。目的探讨应用数字x线摄影技术测量长骨的可行性,并确定放大率是否可以准确校正。材料与方法采用计算机x线摄影(CR)和PMCT对20只后猪(Sus scrofa)的腿进行成像,并通过数字图像和三维CT体积重建获得骨测量数据。浸渍后进行直接测量。使用CR对校准对象成像,以提供放大校正因子。结果采用平均绝对误差(AE)确定准确性,PMCT (MPR)的平均值为3.3 ±2.5 mm, PMCT (3D)的平均值为2.4 ±1.3 mm, CR (PA)的平均值为11.1 ±7.4 mm, CR (LAT)的平均值为18.3 ±14.5 mm。PMCT数据比CR数据更准确。通过放大校正,CR数据更接近于直接测量数据,高度估计也有了很大的改变。结论计算机x线摄影的放大影响骨测量数据和由此产生的身高估计。应用校正因子可能是提高精度的可行选择。为了在法医人类学中可靠地使用数字放射照相,需要进一步的实证研究来验证放大校正方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Accuracy of computed radiography in osteometry: A comparison of digital imaging techniques and the effect of magnification

Introduction

Osteometric data may be obtained using digital imaging techniques, such as post-mortem computed tomography (PMCT) and digital radiography, non-invasively and without ethical objection. Osteometric data from PMCT is known to be as accurate as taking direct measurements. Digital radiography is more accessible and affordable than PMCT but is limited due to the magnification of its subjects.

Objectives

To investigate the viability of implementing digital radiographic techniques for measurement of long bones, and to establish whether magnification can be accurately corrected for.

Materials and Methods

Twenty hind pig (Sus scrofa) legs were imaged using computed radiography (CR) and PMCT, and osteometric data obtained from the digital images and 3D CT volume reconstructions. Direct measurements were taken following maceration. A calibration object was imaged using CR, to provide magnification correction factors.

Results

Accuracy was determined by mean absolute error (AE), giving values of 3.3 ± 2.5 mm for PMCT (MPR), 2.4 ± 1.3 mm for PMCT (3D), 11.1 ± 7.4 mm for CR (PA), and 18.3 ± 14.5 mm for CR (LAT). PMCT data was more accurate than CR data. Through applying correction for magnification, CR data became closer to the direct measurement data, and stature estimation was substantially altered.

Conclusion

Magnification in computed radiography affects osteometric data and resulting stature estimations. Applying correction factors may be a viable option for improving accuracy. For digital radiography to be used reliably in forensic anthropology, further empirical research is needed to validate a magnification correction method.

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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-
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