Radiographic method and apparatus for reducing the effects of sc

Details Radiographic method and apparatus for reducing the effects of sc Radiographic method and apparatus for reducing the effects of sc

1985-02-25

1987-03-17

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

250363S, 250393, 250395, 2503581, 378155, G01T 1161

Patent

active

046510028

ABSTRACT:
In a radiographic method, first and second collimator elements are arranged between a radiation source and an image converter. When an object is irradiated with radiation beams, the collimatar elements can be switched between first and second states. In the first state, the collimator elements pass both some of the transmitted radiation beams which are not scattered by the object and transmitted therethrough and scattered radiation beams which are scattered by the object so that a first radiation image is obtained in the form of electrical signals based on the transmitted radiation beams and the scattered radiation beams. In the second state, the collimator elements pass only some of the scattered radiation beams scattered by the object so that a second radiation image is obtained in the form of electrical signals based on only the scattered radiation beams. The first and second radiation images are electrically processed to reproduce and display a two-dimensional transmitted image which is not influenced by spatial variation of radiation-transmittance for the collimator elements and by the scattered radiation beams.

REFERENCES:
patent: 4097748 (1978-06-01), Monvoisin
patent: 4149080 (1979-04-01), Schittenhelm
patent: 4433427 (1984-02-01), Barnea
patent: 4465540 (1984-08-01), Albert

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