Precision of surface measurements for below-knee residua
Precision of surface measurements for below-knee residua
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DOI：
10.1016/s0003-9993(96)90037-4
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发表时间：
1996-05-01
影响因子：
4.3
通讯作者：
Vannier, MW
中科院分区：
文献类型：
--
作者：
Commean, PK;Smith, KE;Vannier, MW
目的：用卡尺、电磁数字化仪法、光学表面扫描仪(OSS)和螺旋X射线计算机断层扫描仪(SXCT)对膝关节以下残牙及其BK石膏阳性模型进行几何测量，以确定绝对和相对精度。设计：单次测量的实验方案为：在残牙上放置点标记，用水位移和卡尺测量体积和距离；用电磁数字化仪测量残牙；用三维(3D)OSS扫描残牙；制作被试残牙的石膏模型；用SXCT扫描仪扫描残牙。这些步骤在第二次测量会议上重复。石膏阳性模型被构建，并随后使用相同的方案进行测量。参与者：13名成年膝下截肢志愿者(对象)参与了研究，9名对象返回进行第二次测量。研究组包括9名男性和4名女性；10名高加索人和3名非洲裔美国人。结果：所有测量装置的体内测量重复性在1%以内，石膏模型上重复性在0.5%以内；体积在体内测量体积在1%以内，在石膏模型上重复性在0.1%以内。与卡尺和水位移法相比，每个装置的体内距离测量精度在3%以内，石膏模型上的距离测量精度在1%以内；体内体积测量的精度在5%以内，石膏模型上的距离测量精度在6%以内。结论：这些测量系统在测量肢体残端的重复性和精确度方面基本相同。(C)1996年美国康复医学大会和美国物理医学和康复学会
Objective: To determine the absolute and relative precision of geometric measurements made of below knee (BK) residua and their BK plaster positive casts using calipers, electromagnetic digitizer, optical surface scanner (OSS), and spiral x-ray computed tomography (SXCT).Design: The experimental measurement protocol for a single measurement session was as follows: Dot markers were placed on the residuum, and volume and distances were measured using water displacement and calipers; residuum was measured using electromagnetic digitizer; residuum was scanned using three-dimensional (3D) OSS; a negative plaster cast of subject's residuum was made; and residuum was scanned using SXCT scanner. These steps were repeated at a second measurement session. Plaster positive casts were constructed and subsequently measured using the same protocol.Participants: Thirteen adult below-knee amputee volunteers (subjects) participated in the study, and nine subjects returned for a second measurement session. The study group consisted of 9 men and 4 women; 10 Caucasians and 3 African Americans.Results: Distance measurements for all measurement devices were repeatable within 1% in vivo and within 0.5% on plaster casts; and volumes were within 1% in vivo and within 0.1% on plaster casts. Distance measurements for each device were precise within 3% in vivo and within 1% on plaster casts; and volumes were within 5% in vivo and within 6% on plaster casts when compared with caliper and water displacement measures.Conclusion: These measurement systems were found to be substantially equivalent in terms of repeatability and precision for measurement of lower extremity residua.(C) 1996 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation