Scanning line source for gamma camera

Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor

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2504981, G01T 1166, G01T 1161

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active

058347801

ABSTRACT:
A gamma camera system includes two or more radiation detector heads and which are mounted opposite each other to a gantry for rotation about a subject. A transmission radiation source assembly is mounted to the front face of at least one of the detectors and can be moved across the face of the detector. The source assembly includes a radiation attenuating housing, a leaded bronze source holder, and a radionuclide source. The radionuclide source is retained in a longitudinal groove disposed in the source holder. The source holder may be rotated into open, closed, and access positions. The transmission radiation emitted by the source assembly is directed across the examination region, attenuated by the subject, and detected by the opposed detector. The gamma camera system also includes a filter which selectively attenuates the transmission radiation based on the attenuation profile of the object so as to prevent saturation of the opposed detector. An image representation is reconstructed using the radiation emitted by the subject and corrected in accordance with the transmitted radiation data.

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Larsson, et al.; "Simultaneous SPECT and CT with Shutter Controlled Radionuclide Sources and Parallel Collimator Geometry" IEEE Trans. Nuc. Sci.; vol. 40, No. 4, Aug. 1993, pp. 117-1122.
Tan, et al.; "A Scanning Line Source for Simultaneous Emission and Transmission Measurements in SPECT" The Journal of Nuc. Med., vol. 34, No. 10, Oct. 1993, pp. 1752-1760.
ADAC Laboratories Advertisment; Date Unknown.
U.S. Appl. Ser. No. 08/374,977; Plummer, et al.; filed Jan. 19, 1995; "Emission/Transmission Device for use with a Dual Head Nuclear Medicine Gamma Camera with the Transmission Source Located Behind the Collimator".
U.S. Appl. Ser. No. 08/483,276; Morgan, et al.; filed Jun. 7, 1995, "Gamma Camera Split Collimator Collimation Method and Apparatus".

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