Variable filters used with radiation source to reduce unobstruct

Details Variable filters used with radiation source to reduce unobstruct Variable filters used with radiation source to reduce unobstruct

1995-05-11

1996-09-03

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

2504981, G01T 100

Patent

active

055526063

ABSTRACT:
A variable filter arrangement wherein differently sized and shaped filters are automatically selected and installed from a collection of filters housed within a configuration for use with a radiation source. The line source is typically used for transmission scanning to collect attenuation correction factors. A line source is utilized in the preferred embodiment and a series of filters (e.g., differently sized "bow-tie" filters) are rotatably attached to a central junction so that a particular filter can be rotated into an installed position. When installed, the filter acts to attenuate the radiation emitted from the line source to reduce radiation emitted on an otherwise unobstructed area of a scintillation detector. Differently sized filters are advantageously used to accommodate differently sized patents and also to accommodate different unobstructed parts of a detector for different angles of rotation during an ECT transmission scan. The system includes processing intelligence to automatically select the proper filter given body contour (e.g., profile) information.

REFERENCES:
patent: 3784821 (1974-01-01), Jaszczak
patent: 5465284 (1995-11-01), Karellas
patent: 5479021 (1995-12-01), Morgan et al.
Patrick Tan et al., A Scanning Line Source for Simultaneous Emission . . . , The Journal of Nuclear Medicine, Oct. 1993, pp. 1752-1758.
R. J. Jaszczak, et al., Fast Transmission CT for Determining Attenuation Maps . . . , The Journal of Nuclear Medicine, Sep. 1993, pp. 1577-1586.
Eric C. Frey, et al., Simultaneous Aquisition of Emission and Transmission Data . . . , The Journal of Nuclear Medicine, Dec. 1992, pp. 2238-2245.
C. H. Tung, et al. Non-Uniform Attenuation Correction Using Simultaneous Transmission and Emission . . . , 0-70813-0513-2/92, pp. 2018-2022.
S. H. Manglos, Truncation artifact suppression in cone-beam radionuclide . . . , Phys. Med. Biol., 1992, pp. 549-562.
R. J. Jaszczak, D. R. Gilland, M. W. Hanson, S. Jang, K. L. Greer, R. E. Coleman, "Fast Transmission CT For Determinig Attenuation Maps Using A Collimated Line Source, Rotatable Air-Copper-Lead Attenuators and Fan-Beam Collimation", Transmission CT for SPECT Attenuation Compensation, pp. 1577-1586 J. of Nuclear Medicine (Sep. 1993).

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