Rotating X-ray mask with sector slits

Details Rotating X-ray mask with sector slits Rotating X-ray mask with sector slits

1985-06-11

1987-02-24

Howell, Janice A.

X-ray or gamma ray systems or devices

Beam control

Scanner

378160, G21K 510, G21K 104

Patent

active

046463399

ABSTRACT:
In an X-ray system with a rotating disk having sector slits transmitting fan shaped X-ray beams from a source through a subject to the image area of an X-ray receptor an improved ratio S/P of X-rays (S) scattered from the subject to primary rays (P) forming a true image of the subject at the image area is realized if the dimensions of the system fall within the following ranges of dimensionless ratios:

REFERENCES:
patent: 2730566 (1956-01-01), Bartow et al.
patent: 3780291 (1973-12-01), Stein et al.
patent: 4315146 (1982-02-01), Rubin
patent: 4403338 (1983-09-01), Rubin
patent: 4404591 (1983-09-01), Bonar
Moore et al, "A Method to Absorb Scattered Radiation without Attenuation of the Primary Beam", Radiology, 120: 713-717, Sep. 1976.
Sorenson et al., "Investigations of Moving-Slit Radiology", Radiology, 120: 705-711, Sep. 1976.
Dick et al., "X-Ray Scatter Data for Diagnostic Radiology", Phys. Med. Biol., 1978, vol. 23, No. 6, 1076-1085.
Barnes et al., "The Design and Performance of a Scanning Multiple Slit Assembly", Med. Phys., 6(#) May/Jun. 1979, 197-204.
Sorenson et al., "Slit Radiography: Problems and Potential", SPIE, vol. 23, Application of Optical Instrumentation in Medicine VIII, 1980, pp. 240-243.
Bonar, "Dose Efficiency Improvement by Rotating Adjustable Apertures in an Image Intensifier X-Ray Diagnostic System", SPIE, vol. 314, Digital Radiography, 1981, pp. 81-87.
Yester et al., "Experimental Measurements of the Scatter Reductions . . . with a Scanning Multiple Slit Assembly", Med. Phys., 8(2) Mar./Apr. 1981, 158-162.
Johns et al., "Scattered Radiation in Fan Beam Imaging Systems", Med. Phys., 9(2), Mar./Apr. 1982, pp. 231-239.

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