Determining body composition using fan beam dual-energy...

Details Determining body composition using fan beam dual-energy... Determining body composition using fan beam dual-energy...

A - Human Necessities

61

B

A61B 6/00 (2006.01) A61B 6/03 (2006.01) G01N 23/083 (2006.01)

Patent

CA 2305911

True body composition is estimated using a dual-energy, fan-shaped distribution of x-rays and signal processing that corrects for mass magnification and other effects due to the geometry of the measurement system. To avoid inaccuracies due to beam hardening and certain other effects, the thickness of attenuating material along respective raypaths is obtained through using a four-dimensional look-up table derived experimentally from step-wedge measurements. To correct for mass magnification effects due to using a fan-shaped distribution of x-rays, another look-up table and interpolation between table entries are used to convert projected mass to true mass.

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