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Definition: 'Energy Subtraction'

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energy subtraction

Type: Term

1. 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.

The definition information for energy subtraction is provided by Stedman's. You can search our medical dictionary here.

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