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Truncation compensation algorithm for iterative reconstruction

An iterative, field-of-view technology used in diagnostic imaging systems to reduce artifacts

Active Publication Date: 2007-11-28
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Allowing backprojection of error values ​​from comparisons leads to errors and artifacts in less densely sampled regions, such as object truncation where no data for comparison exists in the detector

Method used

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  • Truncation compensation algorithm for iterative reconstruction
  • Truncation compensation algorithm for iterative reconstruction
  • Truncation compensation algorithm for iterative reconstruction

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Embodiment Construction

[0018] Referring to FIG. 1 , a nuclear imaging system 10 generally includes a stationary gantry 12 supporting a rotatable gantry 14 . One or more detection heads 16 are supported by a rotatable gantry 14 for detecting radiation events emitted from a region of interest or examination region 18 . Each detection head comprises a two-dimensional array of detector elements or detectors 20, such as scintillators and photosensitive elements, eg photomultiplier tubes, photodiodes, or the like. It is also contemplated to direct X-rays to electrical transducers such as CZT elements. Each detector head 16 includes circuitry 22 for converting each radiation response into a digital signal representing position (x, y) and energy (z) onto the detector surface. The event location on the detector 20 is resolved and / or determined in a two-dimensional (2D) Cartesian coordinate system using normalized x and y coordinates. However, other coordinate systems are contemplated. The collimator 24 co...

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Abstract

An imaging system (10) includes at least one radiation detector (20) disposed adjacent a subject receiving aperture (18) to detect and measure at least one of emission and transmission radiation from a subject, the detector (20) at a plurality of projection angles. A processor (64) determines which radiation data belong to a field of view of the radiation detector (20) at each projection angle. An image processor (70, 72) iteratively reconstructs the radiation detected only in the determined field of view into image representations. Truncated data is compensated by supplying the untruncated data from the projections taken at different angles at which the truncated data is untruncated.

Description

technical field [0001] The present invention relates to diagnostic imaging systems and methods. It has been found to be particularly suitable for use in conjunction with single photon emission tomography (SPECT) with attenuation compensation and will be described here with specific reference. It should be appreciated that the invention is also applicable to other imaging systems, such as positron emission tomography (PEC), computed tomography (CT) and the like. Background technique [0002] Nuclear medicine imaging uses radiation sources to image patients. Specifically, a radiopharmaceutical is injected into the patient. Radiopharmaceutical compounds comprise radioactive isotopes that undergo gamma-ray decay at a predetermined rate and characteristic energy. One or more radiation detectors are placed adjacent to the patient to monitor and record the emitted radiation. Sometimes the detector is rotated or adjusted around the patient in order to monitor radiation emitted f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/164
CPCG01T1/1615
Inventor J·叶M·K·杜尔宾
Owner KONINKLIJKE PHILIPS ELECTRONICS NV