Qutbi Mohsen, Soltanshahi Mehdi, Shiravand Yaser, Gorzi Saba Karami, Shafiei Babak, Asli Isa Neshandar
Department of Nuclear Medicine, Taleghani Educational Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Science and Research Branch, Islamic Azad University, Tehran, Iran.
Indian J Radiol Imaging. 2020 Jul-Sep;30(3):362-371. doi: 10.4103/ijri.IJRI_495_19. Epub 2020 Oct 15.
Dual-energy X-ray absorptiometry is currently the standard and validated tool for measurement of bone mineral density and for the evaluation of osteoporosis. Current densitometry scanners based on dual-energy X-ray absorptiometry method produce two X-ray beams with different energies to differentiate the overlapped soft tissue and bony structures, by creating two different attenuation profiles. Procedural guidelines are available to technicians and physicians to guarantee the best practice, including consistent positioning during scanning and standard reporting. However, similar to other imaging modalities, dual-energy X-ray absorptiometry may be influenced by technical errors, and thus, imaging artifacts may arise and accuracy and precision of the results may be influenced. This issue may, in turn, affect the final result and interpretation. Hence, the article is arranged with the intention of presenting some less common and rare technical and patient-related sources of error and resultant artifacts, from poor patient preparation to acquisition and data processing. Where appropriate, the corresponding tables of densitometric results (bone mineral density) and statistical parameters (- and -scores) are provided.
双能X线吸收测定法是目前用于测量骨矿物质密度和评估骨质疏松症的标准且经过验证的工具。基于双能X线吸收测定法的当前密度测定扫描仪产生具有不同能量的两束X射线，通过创建两种不同的衰减曲线来区分重叠的软组织和骨骼结构。有程序指南可供技术人员和医生参考，以确保最佳操作，包括扫描期间的一致定位和标准报告。然而，与其他成像方式类似，双能X线吸收测定法可能会受到技术误差的影响，因此可能会出现成像伪影，结果的准确性和精密度可能会受到影响。这个问题反过来可能会影响最终结果和解释。因此，本文旨在介绍一些不太常见和罕见的技术及与患者相关的误差来源以及由此产生的伪影，从患者准备不足到采集和数据处理。在适当的地方，提供了相应的密度测定结果（骨矿物质密度）表和统计参数（T值和Z值）。
