An Improved Technic for the Measurement of Bone Mineral Content in Vivo

摘要: The improved technic described in this paper for the measurement of bone mineral content vivo uses a source 1 or more millicuries I125. radiation from consists essentially monochromatic x-rays (28.5 kev), and energy ratio linear absorption coefficients, bone/tissue, is approximately 10/1 due to tissue small can be taken into account determining content. I125 condensed volume roentgen rays are collimated beam 3 mm. diameter. A NaI(T1) scintillation detector aligned detect transmitted x-ray at distance varying 10 15 cm. source. region studied (often humerus) clamped between two parallel plates so as present an accurately known reproducible thickness plus beam. beam-and-detector unit then motor driven slow speed across region. ...