Reconstructing image

Patent metadata

Field	Value
Publication number	US-10535165-B2
Application number	US-201715604859-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 25, 2016
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

Methods, devices, and apparatus, including computer programs encoded on a computer storage medium for reconstructing image are provided. In one aspect, a method of reconstructing image includes obtaining scanning data for a subject in a continuous incremental scanning of medical equipment including real crystals for detection, associating each of the real crystals with one or more virtual crystals in a virtual scanning system, determining delay random coincidence data of two virtual crystals connected by a response line in the virtual scanning system, obtaining random coincidence data by denoising the delay random coincidence data based on crystal receiving efficiency for each of the real crystals, and reconstructing an image with the scanning data by taking the random coincidence data into account.

First claim

The invention claimed is:

1. A method of reconstructing image comprising:
obtaining scanning data for a subject in a continuous incremental scanning mode of a real scanning system including real crystals for detection, the scanning data including information of single-photons received by each of the real crystals when the real crystal relatively moves to a scanning position on the subject in the continuous incremental scanning mode;
constructing a virtual scanning system including a plurality of virtual crystals, each of the virtual crystals being associated with one or more real crystals each having a same relative position relationship with a respective scanning position on the subject in the real scanning system as the virtual crystal with the respective scanning position in the virtual scanning system, a size of each of the virtual crystals being the same as a size of each of the real crystals;
determining, based on the scanning data, delay random coincidence data of two virtual crystals connected by a response line in the virtual scanning system, the response line corresponding to a particular scanning position on the subject;
denoising the delay random coincidence data based on a crystal receiving efficiency for each of a plurality of real crystals associated with the two virtual crystals and the particular scanning position; and
reconstructing an image with the scanning data by using the denoised delay random coincidence data,
wherein denoising the delay random coincidence data comprises:
determining a respective crystal receiving efficiency of each of the plurality of real crystals;
determining a crystal pair receiving efficiency for the two virtual crystals according to the crystal receiving efficiencies of the plurality of real crystals; and
denoising the delay random coincidence data according to the determined crystal pair receiving efficiency,

wherein a first virtual crystal of the two virtual crystals is associated with a plurality of first real crystals,
wherein a second virtual crystal of the two virtual crystals is associated with a plurality of second real crystals, each of the first real crystals corresponds to a respective one of the second real crystals for the particular scanning position, and
wherein determining the crystal pair receiving efficiency for the two virtual crystals comprises:
multiplying a first crystal receiving efficiency for each of the first real crystals with a second crystal receiving efficiency for a second real crystal corresponding to the first real crystal to get a multiplied result; and
determining the crystal pair receiving efficiency for the two virtual crystals by averaging the multiplied results.

2. The method according to claim 1 , further comprising:
obtaining a single-photon counting rate for each of the plurality of real crystals; and
generating the crystal receiving efficiency for the real crystal according to the single-photon counting rate for the real crystal.

3. The method according to claim 2 , wherein obtaining the single-photon counting rate for the real crystal comprises:
determining a number of single-photons received by the real crystal according to the scanning data; and
generating the single-photon counting rate for the real crystal according to the number of single-photons and a time for receiving the single-photons.

4. The method according to claim 2 , wherein obtaining the single-photon counting rate for the real crystal comprises:
determining a plurality of single-photon counting components corresponding to the particular scanning position of the subject, wherein each of the single-photon counting components includes a number of single-photons received by a corresponding real crystal of the plurality of real crystals when the corresponding real crystal moves to the particular scanning position;
determining, according to the plurality of single-photon counting components, a number of single-photons received by one of the two virtual crystals associated with the real crystal;
generating a single-photon counting rate for the one of the two virtual crystals according to the number of single-photons received by the one of the two virtual crystals and scanning time corresponding to the particular scanning position; and
generating the single-photon counting rate for the real crystal according to the single-photon counting rate for the one of the two virtual crystals and a proportional relationship between real crystals associated with the one of the two virtual crystals.

5. The method according to claim 2 , wherein generating the crystal receiving efficiency for the real crystal according to the single-photon counting rate for the real crystal comprises:
generating the crystal receiving efficiency for the real crystal according to the single-photon counting rate for the real crystal and a relationship between single-photon counting rate and crystal receiving efficiency for the real crystal under different doses.

6. The method according to claim 5 , further comprising:
determining, under a particular dose, a single-photon counting rate for the real crystal and a mean value of single-photon counting rates for a number of real crystals including the real crystal;
determining a crystal receiving efficiency of the real crystal under the particular dose based on the determined single-photon counting rate for the real crystal and the mean value of single-photon counting rates of the number of real crystals; and
determining the relationship based on a ratio between the determined crystal receiving efficiency of the real crystal and the single-photon counting rate under the particular dose.

7. The method according to claim 2 , wherein generating the crystal receiving efficiency for the real crystal according to the single-photon counting rate for the real crystal comprises:
under a same dose, determining a ratio between the single-photon counting rate for the real crystal and a mean value of the single-photon counting rates for a number of real crystals including the real crystal; and
taking the determined ratio as the crystal receiving efficiency for the real crystal.

8. The method according to claim 1 , further comprising:
obtaining random coincidence data by, with an assumption that the two virtual crystals are virtual crystal i and virtual crystal j on the response line, the virtual crystal i belonging to a set A comprising m number of first virtual crystals and the virtual crystal j belonging to a set B comprising m number of second virtual crystals, denoising:
delay random coincidence data for the virtual crystal i and a virtual crystal 1 among the set B according to a crystal pair receiving efficiency for the virtual crystal i and the virtual crystal 1 ,
delay random coincidence data for the virtual crystal j and a virtual crystal k among the set A according to a crystal pair receiving efficiency for the virtual crystal j and the virtual crystal k, and
delay random coincidence data for the virtual crystal 1 and the virtual crystal k according to a crystal pair receiving efficiency for the virtual crystal 1 and the virtual crystal k,
wherein i, j, k and l are non-negative integers; and

reconstructing the image with the scanning data by using the obtained random coincidence data.

9. A device for reconstructing image applied to medical equipment comprising real crystals, the device comprising:
a processor configured to execute machine executable instructions corresponding to control logic for reconstructing image stored on a machine readable storage medium such that when the machine executable instructions are executed, the processor is caused to:
obtain scanning data for a subject in a continuous incremental scanning mode of

Assignees

• Shenyang Neusoft Medical Sys

Inventors

• Liu Shaolian
• Sun Zhipeng
• Li Yunda

Classifications

• G06T12/30

  Image post-processing, e.g. metal artefact correction · CPC title

• G06T12/00 Primary

  Tomographic reconstruction from projections · CPC title

• A61B6/037 Primary

  Emission tomography · CPC title

• G06T2207/10128

  Scintigraphy · CPC title

• A61B6/5205

  involving processing of raw data to produce diagnostic data · CPC title