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PET random coincidence correction

A sinogram, positron emission technology, applied in the field of nuclear medicine imaging, can solve the problem of increasing noise

Active Publication Date: 2016-12-14
KONINKLJIJKE PHILIPS NV
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Problems solved by technology

The use of delayed coincidence does not add bias but increases noise

Method used

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  • PET random coincidence correction
  • PET random coincidence correction
  • PET random coincidence correction

Examples

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Embodiment Construction

[0018] refer to figure 1 , schematically illustrates an embodiment of a PET system 10 with random coincidence correction. The object is placed in the examination area of ​​the PET scanner 12 . The PET scanner 12 includes a plurality of rings of detectors 14 that detect gamma photons originating from positron annihilation events from radiopharmaceuticals. The time and energy of each detected gamma photon is preferably recorded in the data store or memory 16 in list mode. The recorded gamma photons are filtered using time and energy windows to identify different coincidences, such as cues, scatter, single events, delays, etc. For example, prompts conforming to include in the time window t w Photons that are detected at both detectors within (eg, on the scale of 2-6 nanoseconds) and satisfy a threshold energy level (eg, about 511 keV). The PET scanner 12 can include a counter that counts the number of cue coincident gamma photons detected at each detector and the number of de...

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Abstract

A positron emission tomography (PET) imaging system (10) includes a singles unit (24), a delay unit (26), a scaling unit (28), and a reconstruction unit (30). The singles unit (24) is configured to generate a correction sinogram of random coincidences defined by a coincidence time window tw and a time period t based on rij = 2 t si sj where rij is an estimate of the random coincidences in the time period t between singles at detector locations si and sj. The delay unit (26) is configured to determine delay coincidences in the time period t defined by a delay coincidence time window of a paired coincidences including tw to 2 tw. The scaling unit (28) is configured to scale the correction sinogram of random coincidences based on the delay coincidences. The reconstruction unit (30) is configured to iteratively reconstruct one or more images based on the scaled random sinogram and a prompt sinogram for the time period t.

Description

technical field [0001] The following generally relates to nuclear medicine imaging. It finds particular application in conjunction with positron emission tomography (PET) and stochastic coincidence estimation, and will be described with particular reference to electron emission tomography and stochastic coincidence estimation. However, it should be understood that it applies to other use cases as well and is not necessarily limited to the aforementioned applications. Background technique [0002] In PET imaging, detected coincidences from radiopharmaceuticals administered to a patient include true, scatter, single and random coincidences. The true coincidence is the result of positron emission and subsequent annihilation generating two gamma photons along the line of response (LOR). Photons are detected by the detectors of PET scanners, typically in a ring configuration. When two gamma photons are received within a selected coincidence time window, the gamma photons are c...

Claims

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005G06T3/40G06T7/0012G06T2207/10104G06T2207/30242
Inventor 叶京汉宋犀云
Owner KONINKLJIJKE PHILIPS NV
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