X-ray imaging system calibration using projection means

Details X-ray imaging system calibration using projection means X-ray imaging system calibration using projection means

1986-04-11

1987-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

378207, H01J 3150

Patent

active

046970754

ABSTRACT:
An image evaluation apparatus for quantitative and qualitative evaluation of an optical image generated by an x-ray imaging system of the type including an x-ray source, an image intensifier tube for converting received x-ray radiation to optical images to be recorded photographically and/or electronically. The evaluation apparatus comprises an image projection device in the form of a cylindrical housing having a lens mounted in one end and a light diffuser mounted in a second end. The lens is of the type having a focal point at infinity such that all of the light passing through the lens is substantially parallel. The evaluation apparatus is mounted to the x-ray imaging system in a position normally occupied by one of the recording or display apparatus so as to be in a position for receiving light generated by the optical image on the image intensifier tube. The received light is focused onto the diffuser and its intensity is measured using a light photometer. The intensity distribution measurement on the diffuser provides an indication of the performance of the imaging system including the intensifier tube and associated optical transmission elements in the light transmission path.

REFERENCES:
patent: 3558893 (1971-01-01), Ball
patent: 4511927 (1985-04-01), Bauer

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