Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Structurally defined
Patent
1983-10-13
1985-07-02
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Structurally defined
430139, 430502, 430503, 430507, 430509, 430966, 430967, 2504752, 2504821, G03C 184, G03C 192, G03B 4116, G03B 1100
Patent
active
045268622
ABSTRACT:
Film packages for obtaining x-ray energy-difference images simultaneously by exposing a body to a broad energy spectrum x-ray beam. One package embodiment has two radiographic films joined at at least two edges to form a pocket in which a light-opaque sheet is inserted during the x-ray exposure. The package is disposed between front and rear x-ray intensifying screens during the exposure. The front screen on which the broad energy image is incident is excited to luminescence predominantly by x-ray photons in one energy band and the rear screen by photons in another band to thereby produce the difference images. The opaque sheet may contain x-ray filter material. A reflective sheet is substituted in the pocket for said opaque sheet during readout of the intensities of corresponding picture elements. Another film package embodiment is laminated and unitary and has a double-sided reflective sheet in the middle, a light-opaque coating on each reflective surface and a photosensitive emulsion on each coating. The unitary film package can be inserted between two screens, of the type described above, in a cassette during an exposure.
REFERENCES:
patent: 3822131 (1974-07-01), Cleare
patent: 4029963 (1977-06-01), Alvarez et al.
patent: 4130429 (1978-12-01), Van Doorselaer
patent: 4172730 (1979-10-01), Hinata et al.
patent: 4425426 (1984-01-01), Abbott et al.
"Digital Radiography", DigiRad Corporation, May 1983.
"Radiographic Films/Materials", Carpenter, Research Disclosure, No. 18431, 8/1979, pp. 433-441.
General Electric Company
Schilling Richard L.
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