Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pet detector timing calibration

A technology of detectors and radiation detectors, applied in the field of medical imaging, can solve the problems of reducing the timing accuracy of crystals, etc.

Active Publication Date: 2017-08-29
KONINKLJIJKE PHILIPS NV
View PDF9 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Including scattered photons in the measurement also reduces crystal timing accuracy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pet detector timing calibration
  • Pet detector timing calibration
  • Pet detector timing calibration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The present application provides systems and methods for calibrating timing in PET systems. Said disadvantages can be overcome by the present application. This application uses a flake source or a variation of the flake source to calibrate TOF-PET timing. The source is a large flat slice such that all LORs to intersect the object pass through the slice source when placed parallel to the central axis (eg, horizontally in the center). The flake source may be rotated such that all LORs intersect the flake source in at least one orientation. Using a slab source or similar type of source for timing calibration results in large LOR coverage, negligible scatter contribution, and varies narrow activity distributions along each LOR. Also, there is no need to indirectly derive LOR timing for any LOR since there is a direct coincident event count available for each active LOR. Since the activity is narrowly distributed along each LOR (ie, essentially at a single point), the num...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A diagnostic imaging system comprises a plurality of radiation detectors (20) configured to detect radiation events emanating from an imaging region. The system comprises a calibration phantom (14) configured to be disposed in the imaging region spanning substantially an entire field of view and to generate radiation event pairs that define lines-of-response, wherein the calibration phantom is thin such that each LOR intersects the calibration phantom along its length, the thickness of the phantom being smaller than the length of the LORs. A calibration processor (24) receives input of the radiation detectors and calculates an incidence angle independent crystal delay tau i for each detector. The calibration processor (24) constructs a first look-up table for the timing correction of each LOR and a second look-up table for the angle depth of interaction correction for each crystal by combining tau i and eta i.

Description

technical field [0001] This application relates generally to medical imaging. It has particular application in connection with the calibration of positron emission tomography (PET) detectors and will be described with particular reference thereto. However, it should be understood that it is also applicable to other usage scenarios and is not necessarily limited to the aforementioned applications. Background technique [0002] In time-of-flight (TOF)-enabled PET, the reconstruction algorithm relies on precise timing calibration for each line of response (LOR). Current calibration methods use positron emitting point sources, cylinder sources, or patient data to determine scintillator crystal timing. However, these sources are not favorable for timing calibration of PET systems. Point sources are small and direct event counting is not available for many valid LORs. The cylindrical source is so large that along each LOR the source is distributed over a large area. [0003] ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/29A61B6/00A61B6/03
CPCA61B6/037A61B6/585G01T1/2985A61B6/4266A61B6/583
Inventor 叶京汉宋犀云T·L·劳伦斯S·X·王
Owner KONINKLJIJKE PHILIPS NV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com