Discipline of Endocrinology, Department of Medicine, Universidade Federal de São Paulo (UNIFESP), Rua Estado de Israel, 639, São Paulo, SP, 04022-001, Brazil.
Department of Nutrition, School of Public Health, Universidade de São Paulo (USP), São Paulo, SP, Brazil.
Adv Rheumatol. 2022 Mar 20;62(1):7. doi: 10.1186/s42358-022-00241-8.
To review the technical aspects of body composition assessment by dual-energy X-ray absorptiometry (DXA) and other methods based on the most recent scientific evidence.
This Official Position is a result of efforts by the Scientific Committee of the Brazilian Association of Bone Assessment and Metabolism (Associação Brasileira de Avaliação Óssea e Osteometabolismo, ABRASSO) and health care professionals with expertise in body composition assessment who were invited to contribute to the preparation of this document. The authors searched current databases for relevant publications. In this first part of the Official Position, the authors discuss the different methods and parameters used for body composition assessment, general principles of DXA, and aspects of the acquisition and analysis of DXA scans.
Considering aspects of accuracy, precision, cost, duration, and ability to evaluate all three compartments, DXA is considered the gold-standard method for body composition assessment, particularly for the evaluation of fat mass. In order to ensure reliable, adequate, and reproducible DXA reports, great attention is required regarding quality control procedures, preparation, removal of external artifacts, imaging acquisition, and data analysis and interpretation.
根据最新的科学证据，回顾双能 X 射线吸收法（DXA）和其他基于体成分评估方法的技术方面。
本立场文件是巴西骨评估与代谢协会（Associação Brasileira de Avaliação Óssea e Osteometabolismo，ABRASSO）的科学委员会以及具有体成分评估专业知识的医疗保健专业人员努力的结果，他们受邀参与本文件的编写。作者在当前数据库中搜索了相关出版物。在本立场文件的第一部分，作者讨论了体成分评估使用的不同方法和参数、DXA 的一般原理以及 DXA 扫描的采集和分析方面。
考虑到准确性、精密度、成本、持续时间以及评估所有三个隔室的能力，DXA 被认为是体成分评估的金标准方法，特别是用于评估脂肪量。为了确保 DXA 报告可靠、充分且可重复，需要高度关注质量控制程序、准备、去除外部伪影、成像采集以及数据的分析和解释。
