Xenon calibration phantom

摘要

A xenon concentration phantom (A) is mounted in a CT scanner (B). A xenon/oxygen breathing gas mixture from a breathing gas supply system is (C) circulated through an analysis chamber (12) of the phantom before a human scan is commenced. The CT scanner measures the amount of radiation absorption attributable to the gas in the analysis chamber, which absorption varies in proportion to the concentration of xenon gas. The measured radiation absorption is converted into a precise measurement or indication of the xenon concentration of the breathing gas. The precise xenon concentration measurement may be utilized to calibrate xenon gas detectors (80, 100) in the breathing gas supply system or to calibrate xenon concentration dependent diagnostic data generated during a subsequent patient scan while the patient is breathing the breathing gas.