Citation:
Judy PF, San Jose Estépar R, Ross JC, Washko GR, Silverman EK, Lynch DA, the COPDGene Investigators &. Trachea Air: Internal Reference Standard For CT Lung Densitometry. American journal of respiratory and critical care medicineAmerican journal of respiratory and critical care medicine 2012;185:A2037.
Date Published:
JunAbstract:
RATIONALE: The nominal CT number of air is -1000HU. In contemporary multi-slice CT scanners, the CT number of air in the trachea is greater than -1000HU. Consequently, the value of trachea air CT number of an individual subject’s image might be used as an internal reference standard for CT lung densitometry.