energy subtraction

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.

energy subtraction

a radiographic technique in which two different x-ray beams are used alternately to provide a subtraction image resulting from differences in photoelectric interaction.

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.
References in periodicals archive ?
The RADspeed Pro EDGE employs cutting-edge technologies like tomosynthesis, speed stitch, and dual energy subtraction.
A flexible fully automated positioning system, offering a broad range of easy-to-use advanced applications including tomosynthesis, energy subtraction, and long length imaging--giving facilities the tools they need to better support challenging exams and diagnosis.
Dual energy subtraction radiography--Adding critical information to the diagnosis of chest disease.
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