Method and apparatus for accurately calibrating an attenuation m

Details Method and apparatus for accurately calibrating an attenuation m Method and apparatus for accurately calibrating an attenuation m

1995-12-29

1997-10-28

Porta, David P.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

2502521, G01T 1166

Patent

active

056820364

ABSTRACT:
A method of calibrating an attenuation map for use in emission imaging in a gamma camera system. The attenuation map is generated using a transmission scan of the object of interest. The map includes a number of attenuation coefficients for the object. A computer program for generating the attenuation map includes an instruction for scaling the attenuation coefficients in the map from the transmission energy level to the emission energy level using a scaling factor. The scaling factor includes an effective attenuation coefficient for water, which is determined empirically. To determine the effective attenuation coefficient, the number of photons which pass from a transmission source through known depths of water using the emission energy level is counted. The effective attenuation coefficient is computed based on a standard equation describing the attenuation of photons by an absorber. The scaling factor used by the computer program is then set based on the effective attenuation coefficient.

REFERENCES:
patent: 5338936 (1994-08-01), Gullberg et al.
Patrick Tan, et al., "A Scanning Line Source for Simultaneous Emission and Transmission Measurements in SPECT," The Journal of Nuclear Medicine, vol. 34, No. 10, pp. 1752-1758, Oct. 1993.

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