Olkkonen H, Karjalainen P
Br J Radiol. 1975 Jul;48(571):594-7. doi: 10.1259/0007-1285-48-571-594.
A new technique for the determination of absolute bone density is described. The procedure is based on the measurement of both transmitted and scattered photons emitted from a 650 mCi radioisotope source of 170Tm in a narrow beam geometry. The method takes into consideration the change in the effective Z/A as a function of bone density which is due to the changing of the elementary composition of bone when bone material is resorbed. The experimental results show that the density of homogeneous materials can be measured with a reproducibility of 2 per cent. The bone density values for the 24 bone specimens measured by the new method show a good correlation (r=0 with 94) with results obtained by application of Archimedes' principle.
本文描述了一种测定绝对骨密度的新技术。该方法基于在窄束几何条件下对从650毫居里的170Tm放射性同位素源发射的透射光子和散射光子进行测量。该方法考虑了有效Z/A随骨密度的变化，这种变化是由于骨材料吸收时骨的元素组成发生变化所致。实验结果表明，均质材料密度的测量具有2%的重现性。用新方法测量的24个骨标本的骨密度值与应用阿基米德原理得到的结果具有良好的相关性（r = 0.94）。
