Frohn J, Wilken T, Falk S, Stutte H J, Kollath J, Hör G
Department of Radiology, J.W. Goethe University Medical Center, Frankfurt/Main, Federal Republic of Germany.
J Nucl Med. 1991 Feb;32(2):259-62.
Measurements of the bone mineral content (BMC) of lumbar spine by dual-photon absorptiometry (DPA) are performed mainly in the anteroposterior (AP) projection. Due to superimposition of the abdominal aorta, the BMC measured for patients with aortic calcification usually is too high. To determine the influence of aortic calcifications, DPA scans were performed in the AP-projection on 100 dissected abdominal aortae with different degrees of atherosclerosis placed on a human lumbar spine cast in lucite. The measured values were compared with those obtained in the same projection without the aortae. The average increase of the BMC values relative to the mean for the vertebrae L2 to L4 for aortae with severe complicated lesions, i.e., those containing larger amounts of calcium, was 0.03 g/cm2, with a maximum deviation of 0.09 g/cm2. Aortae with fatty streaks or fibrous plaques did not cause significant increases of the BMC. The mean deviation for aortae with mild complicated lesions, i.e., those containing smaller amounts of calcium, was within the range of instrument precision.
采用双光子吸收法（DPA）测量腰椎骨矿物质含量（BMC）主要是在前后位（AP）投影下进行。由于腹主动脉的重叠，对于有主动脉钙化的患者所测得的BMC通常过高。为了确定主动脉钙化的影响，对放置在有机玻璃制人体腰椎模型上的100条具有不同程度动脉粥样硬化的解剖腹主动脉进行了AP投影下的DPA扫描。将测量值与在无主动脉情况下相同投影中获得的值进行比较。对于有严重复杂病变（即含有大量钙）的主动脉，相对于L2至L4椎体平均值，BMC值的平均增加为0.03 g/cm²，最大偏差为0.09 g/cm²。有脂肪条纹或纤维斑块的主动脉并未导致BMC显著增加。对于有轻度复杂病变（即含有较少量钙）的主动脉，平均偏差在仪器精度范围内。
