| 摘要 |
<p>The invention is a low cost automated X-ray bone densitometer capable of measuring bone density in the human body, achieved by simple positioning of the hand, and push button operation. The use of photodiodes of larger size at fixed locations provides a mechanically positioned Region of Interest (ROI) which reduces software and hardware requirements. The compact and low cost tabletop X-ray system is powered by line voltage or battery which exposes the body part and calibration phantom or phantoms simultaneously. The device provides exposures at multiple X-ray energies, MEXA (Multiple Energy W-ray Absorptiometry). The invention also utilizes a CPU (13) for performing an improved calibration method. This method uses calcium hydroxyapatite in a solid tissue equivalent matrix to form the reference calibration phantom (57), which is positioned adjacent to the fingers (62) for simultaneous calibration on each scan.</p> |
