Delta modulated baseline restoration for photon counting computed tomography
AssigneeAnalog Devices, Inc.
InventorPatrick Riehl
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Abstract
One embodiment is a baseline restoration (“BLR”) circuit for a photo-counting computed tomography (“PCCT”) signal chain, the BLR circuit comprising a comparator for comparing a shaper voltage output from a shaper component of the PCCT signal chain with a baseline voltage, the comparator outputting a single bit indicative of whether the shaper voltage is above or below the baseline voltage; a low pass filter connected to filter a voltage signal output from the comparator; and a transconductor connected to receive a filtered voltage signal output from the low pass filter, convert the filtered voltage signal to a current signal, and feed the current signal back to an input of the PCCT signal chain.
Claims20
A baseline restoration (“BLR”) circuit for a photon-counting computed tomography (“PCCT”) signal chain, the BLR circuit comprising:
- an input comparator for comparing a shaper voltage output from a shaper component of the PCCT signal chain with a baseline voltage, the input comparator outputting a single bit indicative of whether the shaper voltage is above or below the baseline voltage;
- and
- a low pass filter connected to filter a voltage signal output from the input comparator.
A method for implementing non-linear baseline restoration (“BLR”), the method comprising:
- comparing a shaper voltage output from a shaper component of a photon-counting computed tomography (PCCT) signal chain with a baseline voltage to produce a comparator voltage indicative of whether the shaper voltage is above or below the baseline voltage at a given time;
- filtering the comparator voltage;
- and
- converting the filtered voltage signal to a current signal.
Dependencies are inferred from the claim text.