Comparison of Two Phantoms for Body Composition with Dual‐Energy X‐ray Absorptiometry

Abstract:

PURPOSE The purpose of this study was to evaluate the features and characteristics of two phantoms being considered for use in the NHANES IV study (National Health and Nutrition Examination Survey) for quality control of body composition measurements using dual-energy X-ray absorptiometry (DXA). METHODS The Variable Composition Phantom or VCP (Lunar Corp., Madison, WI) consists of acrylic blocks and thin sheets of PVC and vinyl used to simulate five different percent fat values. The total weight is about 10 kilograms. The Whole Body Phantom or WBP (Hologic Inc., Bedford, MA) is larger than the VCP and has aluminum embedded in it to simulate the skeleton. It consists of six rectangular blocks of high-density polyethylene and a sheet of PVC. It weighs about 43 kg. We scanned both phantoms and 17 subjects on two QDR 4500A densitometers (scanner A and B). Short-term precision of the phantom …

Año de publicación:

2000

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