energy subtraction

digital radiography using higher- and lower-energy exposures, either by double exposure at 2-kV levels or by interposing a copper filter that absorbs the lower-energy photons between two phosphor plates, with computer calculation of high-Z and low-Z images (bone and soft tissues, respectively); makes use of the fact that lower-energy x-rays are absorbed by more high-Z substances, such as calcium and copper, because of the photoelectric effect.
See also: Z, photoelectric effect, phosphor plate.

Farlex Partner Medical Dictionary © Farlex 2012

en·er·gy sub·trac·tion

(en'ĕr-jē sŭb-trak'shŭn)

Digital radiography using higher- and lower-energy exposures, either by double exposure at 2-kV levels or by interposing a copper filter that absorbs the lower-energy photons between two phosphor plates, with computer calculation of high-Z and low-Z images (bone and soft tissues, respectively); makes use of the fact that lower-energy x-rays are absorbed by more high-Z substances, such as calcium and copper, because of the photoelectric effect.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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