X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1993-11-05
1995-05-23
Porta, David P.
X-ray or gamma ray systems or devices
Beam control
Scanner
378 7, 378154, G21K 300
Patent
active
054188326
ABSTRACT:
A scanning radiographic system having reduced scatter and improved tube loading employs a pre-patient slit to form the x-ray beam into a fan beam and a post-patient slot to eliminate scattered rays from the fan beam. A grid incorporated into the slot permits a further reduction of scatter sufficient to employ a wider slot without detrimental increase in scatter but with significant improvement in tube loading. The lamellae of the grid proceed diagonally across the width of the slot to reduce grid lines and are tipped to focus on the focal spot of the x-ray source.
REFERENCES:
patent: 4096391 (1978-06-01), Barnes
patent: 4277684 (1981-07-01), Carson
patent: 4731807 (1988-03-01), Plessis et al.
patent: 4792900 (1988-12-01), Sones et al.
patent: 5164976 (1992-11-01), Scheid et al.
Reduction of Scatter in Diagnostic Radiology by Means of a Scanning Multiple Slit Assembly, Radiology, vol. 120, No. 3, pp. 691-694, Sep. 1976, Radiological Society of North American, Incorporated.
Scanning Multiple Slit Assembly: A practical and Efficient Device to Reduce Scatter, Gary T. Barnes et al., Am J Roentgenol 129:497-501, Sep. 1977.
The design and performance of a scanning multiple slit assembly, Gary T. Barnes et al., Med. Phys. 6(3), May/Jun. 1979.
Experimental measurements of the scatter reduction obtained in mammography with a scanning multiple slit assembly, Michael V. Yester et al., Med. Phys. 8(2), Mar./Apr. 1981.
Porta David P.
Wong Don
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