Systems and methods for improving position resolution of charge-sharing position sensitive detectors
OwnerKent Burr, Adrian Ivan +1inventors
InventorsKent Burr, Adrian Ivan, James LeBlanc
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Abstract
An imaging system configured to provide improved position resolution is disclosed. The imaging system includes detector acquisition circuitry that is configured to acquire a plurality of rise-times and a plurality of amplitudes from a detector assembly that includes an array of one or more detector elements. The imaging system also includes position determining circuitry that is configured to determine a plurality of respective impact positions on each of the detector elements. The plurality of impact positions is based on at least the plurality of rise-times and the plurality of the amplitudes acquired by the detector acquisition circuitry.
Claims25
An imaging system, comprising:
- detector acquisition circuitry configured to acquire a plurality of rise-times and a plurality of amplitudes from a detector assembly comprising an array of one or more detector elements;
- and
- position determining circuitry configured to determine a plurality of respective impact positions on each of the one or more detector elements based on at least the plurality of rise-times and the plurality of the amplitudes acquired by the detector acquisition circuitry.
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A device for position sensing, comprising:
- a position sensitive avalanche photodiode configured to generate an electrical signal when impacted by one or more photons from an attenuated radiation beam, the position sensitive avalanche photodiode comprising:
- a non-uniform resistive layer disposed between a bottom surface of the position sensitive avalanche photodiode and a plurality of bottom contacts, wherein the bottom surface of the position sensitive avalanche photodiode establishes electrical contact with the bottom contacts via the non-uniform resistive layer.
A method for determining a position of a photon impact, comprising the steps of:
- acquiring a plurality of rise times and a plurality of amplitudes from a position sensitive avalanche photodiode, wherein each rise time and each amplitude is a function of a distance between a respective contact of the position sensitive avalanche photodiode and a respective photon impact on the position sensitive photodiode;
- and
- determining a position of the respective photon impact on the position sensitive avalanche photodiode based on the plurality of rise-times and the plurality of amplitudes.
A method for determining the position of a photon impact, comprising the steps of:
- acquiring a plurality of rise times and a plurality of amplitudes from an array of one or more detector elements;
- and
- determining the position of a photon impact on each of the detector elements based on the plurality of rise-times and the plurality of the amplitudes.
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A computer-readable media, comprising:
- code adapted to acquire a plurality of rise-times and a plurality of amplitudes from an array of one or more detector elements, wherein each rise-time and each amplitude is a function of a distance between a respective contact on each of the detector elements and a respective photon impact on the respective detector element;
- and
- code adapted to determine a position of the photon impact on each of the detector elements based on the plurality of rise-times and the plurality of the amplitudes.
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Dependencies are inferred from the claim text.