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PET imaging using anatomic list mode mask

A mask and pattern technology, applied in the field of reconstruction of list mode data, which can solve the problem of consuming reconstruction iterative steps and resources, etc.

Inactive Publication Date: 2012-01-04
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, if list-mode event data or image domain elements are identified to be excluded by techniques performed during reconstruction, reconstruction iteration steps and resources are still expended prior to identification

Method used

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  • PET imaging using anatomic list mode mask
  • PET imaging using anatomic list mode mask
  • PET imaging using anatomic list mode mask

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Embodiment Construction

[0021] see figure 1 , combined PET / CT system 100 includes a PET gantry portion 102 and a CT gantry portion 104 . The PET gantry portion 102 includes one or more axial rings of radiation sensitive detectors 106 surrounding an examination region 108 . Detector 106 detects gamma-ray irradiation signatures of positron annihilation events occurring in PET examination region 108 .

[0022] The CT section 104 includes a radiation source 110 , such as an x-ray tube that rotates around a CT examination region 112 . Radiation sensitive detectors 114 detect radiation emitted by the X-ray source across the examination region 112 .

[0023] The PET gantry section 102 and the CT gantry section 104 are preferably positioned proximately, with their respective examination regions 108, 112 positioned along a common longitudinal or z-axis. The subject support 116 supports a subject 118 to be imaged, such as a human patient. The subject support 116 is preferably longitudinally movable in coop...

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Abstract

A method and apparatus are provided for reconstructing list mode data acquired during a positron emission tomography scan of an object, the data including information indicative of a plurality of detected positron annihilation events. Detected events occurring in a region of interest are identified; the identified events are reconstructed using an iterative reconstruction technique which includesa ray tracing operation to generate volumetric data indicative of the region of interest, wherein the ray tracing operation traces only image matrix elements located in the region of interest; and a human readable image indicative of the volumetric data is generated. In another aspect an image mask and a projection mask are defined correlating to the region of interest; image matrix elements located in the region of interest are determined by applying the image mask; and detected events occurring in a region of interest are identified by applying the projection mask.

Description

technical field [0001] The present invention relates to the field of positron emission tomography, and more particularly to the reconstruction of list mode data acquired in positron emission tomography (PET). Background technique [0002] Positron emission tomography (PET) is a branch of nuclear medicine in which positron-emitting radiopharmaceuticals such as 18F-fluorodeoxyglucose (FDG) are introduced into the body of a patient. As the radiopharmaceutical decays, positrons are generated. More specifically, each of the plurality of positrons reacts with an electron in a well-known positron annihilation event, generating a coincident pair of 511 keV gamma rays traveling in two opposite directions along the line of response (LOR). Gamma-ray pairs detected during the coincidence time are usually recorded by PET scanners as annihilation events. In time-of-flight ("TOF") imaging, the time at which each gamma ray in the coincident pair is detected within the coincidence time int...

Claims

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Application Information

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IPC IPC(8): G01T1/29G06T11/00
CPCG06T11/006G06T2211/424G01T1/2985G01T1/1611A61B6/037
Inventor D·加尼翁W·王Z·胡
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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