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Comparisons between a pencil beam and two fan beam dual energy X-ray absorptiometers used for measuring total body bone and soft tissue

¹ Department of Medical Physics, Western General Hospital, Edinburgh EH4 2XU ² Osteoporosis Research Unit, Woolmanhill Hospital, Aberdeen AB25 1LD, UK

View larger version (16K): [in a new window]   Figure 1. Variation of measured fat proportion in the limbs of the hardboard phantom with bone mineral density (BMD) of the aluminium skeleton, measured using the Lunar Expert scanner, the Hologic QDR 4500A scanner or the Hologic QDR 1000W scanner.

View larger version (27K): [in a new window]   Figure 2. Differences between total body bone mineral density (BMD), bone mineral content (BMC) and per cent fat measurements from the two Hologic scanners, Hologic QDR 1000W and QDR 4500A, plotted against mean values. , Males; •, females.

View larger version (15K): [in a new window]   Figure 3. Fat percentage measured by the Hologic QDR 1000W plotted against that measured by the Hologic QDR 4500A. VCP, variable composition phantom.

View larger version (24K): [in a new window]   Figure 4. Differences between total body bone mineral density (BMD), bone mineral content (BMC) and per cent fat measurements from the two fan beam scanners, Hologic QDR 4500A and Lunar Expert, plotted against mean values. , Males; •, females.

View larger version (15K): [in a new window]   Figure 5. Fat proportion measured by the Lunar Expert plotted against that measured by the Hologic QDR 4500A. VCP, variable composition phantom.