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Smoothing method and smoothing device

A smoothing, data technology, used in measurement devices, image enhancement, instruments, etc., can solve problems such as inability to use Fourier transform

Active Publication Date: 2016-08-10
TOSHIBA MEDICAL SYST CORP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, any part of the outside of the mask cannot be measured, and the pixel intensity is zero
That is, since Fourier transform is a global transform, Fourier transform cannot be used when applying a mask to areas such as the effective field of view (Field-Of-View: FOV) for reconstruction.

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Embodiment Construction

[0013] Hereinafter, embodiments of the smoothing method and the smoothing device will be described in detail with reference to the drawings. A more complete understanding of the embodiments described in this specification, and the numerous advantages that accompany them, will be more fully understood when considered with reference to the following detailed description in connection with the accompanying drawings. However, the drawings are provided as examples and do not limit the present invention.

[0014] In one embodiment, a method (smoothing method) and apparatus (smoothing method) for smoothing random event data obtained by a PET scanner of Positron Emission Tomography (PET) are provided. device). A method according to one embodiment comprises: a step of obtaining random event data by delayed coincidence counting from data obtained by a PET scanner; and a smoothing step by repeated processing using a benchmark that minimizes the L2 criterion, Smoothing is performed on t...

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Abstract

The smoothing method of the embodiment includes an acquisition step and a smoothing step. Acquisition Procedure From the data obtained by the PET scanner of Positron Emission Tomography (PET), random event data were obtained by delayed coincidence counting. The smoothing step performs smoothing processing on the above-mentioned random event data by repeating processing using a benchmark that minimizes the L2 criterion.

Description

technical field [0001] Embodiments of the present invention relate to a smoothing method and a smoothing device. Background technique [0002] In positron emission tomography (Positron Emission Tomography: PET) reconstruction, the most accurate and common method used for random estimation (random estimation) is delayed coincidence window estimation (delayed coincidence window estimation). In this estimation, the correlation between a pair of photons (between a pair of γ (gamma) rays) generated in one annihilation (annihilation) is completely eliminated, and as a result, only random events (random events) can remain. That is, in PET, random coincidence information that is random coincidence count information is included in coincidence count information generated using a time window for coincidence counting. In correction of this random coincidence information, a method based on delayed coincidence is generally used. Delayed simultaneous counting refers to a method of approx...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/161G06T3/00G06T5/20
CPCG06T5/20G06T2207/10104G06T11/005G06T5/70
Inventor 牛晓锋董云王文莉
Owner TOSHIBA MEDICAL SYST CORP