Compensation of computed tomography data for detector afterglow

Details Compensation of computed tomography data for detector afterglow Compensation of computed tomography data for detector afterglow

1991-11-25

1993-09-28

Envall, Jr., Roy N.

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36441322, 36441313, 378 19, G06F 1500, G01N 2300

Patent

active

052491234

ABSTRACT:
A medical imaging system includes a source of X-rays and a radiation detector that produces an output signal in response to radiation from the source. The detector has an exponential impulse response that is characterized by a plurality of components with different time constants. The output signal from the detector is sampled periodically to acquire a set of radiation attenuation values. A recursive filter applies a filter function to the set of attenuation values that removes effects due to the non-ideal impulse response of the detector. The filter function includes a term for each of the time constant components. An image is reconstructed from the filtered data.

REFERENCES:
patent: 4112303 (1978-09-01), Brandt
patent: 4494141 (1985-01-01), Alterkruse
patent: 4583240 (1986-04-01), Gatten et al.
patent: 4590558 (1986-05-01), Glover et al.
patent: 5008822 (1991-04-01), Brunnett et al.

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