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Compton scatter with polychromatic sources for lung densitometry
Author(s) -
Hanson James A.,
Moore William E.,
Figley Melvin M.,
Duke Peter R.
Publication year - 1984
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595558
Subject(s) - densitometer , densitometry , imaging phantom , optics , detector , physics , nuclear medicine , biomedical engineering , materials science , medicine
A mobile lung densitometer using conventional x‐ray tubes, NaI detectors, and principles of two‐source, two‐detector Compton scattered densitometry, is described. The device is capable of one to two per second density measurements from a 45‐cm 3 volume with a precision of 5%. The expected in vivo accuracy (2%–3%) is determined by using an anthropomorphic phantom with replaceable lung inserts. The unintentional detection of multiple‐scattered x rays results in a small density‐dependent error. This error is predictable and relatively insensitive to differences in surrounding absorbers such as the chest wall. With this device, dynamic in vivo densitometry of the lung in the clinical laboratory and intensive care unit will be possible.