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一、引言SPA－IV利型骨矿分析仪是利用核素．媚一241或碘一125发出的R射线束，对人体活骨进行平面扫描，计算机定时分析，给出精确骨况含量值（BMC）的一种诊断仪器，是诊断早期骨骼生理、病理改变及人体衰老程序的有效手段。但是，我院在使用过程中发现，该机由于没有定位装置
I. INTRODUCTION SPA-IV Bone Mineral Analyzer is the use of radionuclides. The beam of R-rays emitted by Meiyi 241 or Iodide-125 scans the human bones in real time, and is analyzed by computer at regular intervals to give a diagnostic apparatus for accurate bone mass content (BMC). It is used to diagnose early bone physiology, pathological changes and An effective means of human aging procedures. However, during our use in our hospital, we found that the machine has no positioning device.