Dual X-ray absorptiometry: a comparison between fan beam and pencil beam scans

摘要: The recent introduction of dual X-ray absorptiometry (DXA) systems with fan beam instead conventional pencil scanning geometry represents a significant technical advance in bone densitometry. This report describes phantom and in-vivo studies the effect change configuration on DXA measurements. Fan measurements acquired one new generation scanners, Hologic QDR-2000, were compared scans performed an earlier model, QDR-1000. variation height above table anthropomorphic spine were: mineral content (BMC): -3.1% cm-1; projected area (AREA): -2.8% density (BMD): -0.2% cm-1. For magnitude was less than 0.1% QDR-2000 scan results for 20 volunteers correlated closely QDR-1000 data (r = 0.966-0.998). BMD hip, differences between consistent errors expected from measurement precision. AREA BMC data, however, larger observed individual deviations which body habitus subjects. Although to significantly affected clinically more important negligibly small.