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Method and system for dual energy ct image reconstruction

A CT image, dual-energy technology, applied in the field of reconstruction of dual-energy or other multi-energy computed tomography (CT) imaging data, which can solve problems such as low-quality images

Active Publication Date: 2013-10-02
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] A potential difficulty with switching CT scans using fast kVp is that routine reconstruction of the corresponding low-energy and high-energy datasets results in low-quality images
That is, there is not enough low-energy data to generate an image of sufficient quality from the low-energy data alone, and there is not enough high-energy data to generate an image of sufficient quality from the high-energy data alone

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  • Method and system for dual energy ct image reconstruction
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  • Method and system for dual energy ct image reconstruction

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Embodiment Construction

[0016] The disclosed subject matter is intended for use in conjunction with any dual energy imaging system, such as a dual energy CT imaging system. More specifically, refer to figure 1 , in an exemplary embodiment, the imaging system 100 is a medical CT imaging system. The CT imaging acquisition system 102 includes a gantry 104 and a subject support 106 (such as a table or couch) that moves along the z-axis. A patient or other subject (not shown) to be imaged lies or is placed on subject support 106 and moved for placement within bore 108 of gantry 104 . Once the patient or subject is in position within the bore 108 , an X-ray source 110 emits projections of X-rays to be collected by an X-ray data measurement system 112 inside the gantry 104 . ( figure 1 Portion 114 of middle gantry 104 is removed to show x-ray source 110 and x-ray data measurement system 112 housed inside gantry 104 . ) The X-ray source 110 can emit X-rays with at least two different energy levels, and t...

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Abstract

A method and system for dual energy CT image reconstruction are provided. In one aspect, a fast kVp switching x-ray source is used during an imaging scan to produce a low energy x-ray beam for L consecutive projection angles, and then to produce a high energy x-ray beam for H consecutive projection angles, wherein L is substantially less than H. Various methods are provided for estimating the resulting undersampled data in the low energy projection data set and the high energy projection data set. The missing low energy projection data may be estimated from the known high energy projection data using any one of several disclosed structural propagation embodiments.

Description

technical field [0001] The present invention relates generally to the field of imaging, and more particularly to a method and system for reconstructing dual-energy or other multi-energy computed tomography (CT) imaging data. The subject matter of the present application finds particular use in connection with medical imaging systems. However, in its broader aspects, the subject matter of the present application is not limited to the field of medical imaging, and may find application in other fields, such as imaging for security purposes in airports or other checkpoints. Background technique [0002] Spectral CT, and especially fast kVp (kilovolt peak) switching dual-energy CT, is an imaging modality that can extend the capabilities of single-energy CT in certain situations. As an example, two different materials being imaged may attenuate a single energy x-ray beam in approximately the same way, making it difficult to distinguish the two materials with a single energy x-ray...

Claims

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005G06T2211/408A61B6/52
Inventor L·戈申
Owner KONINKLJIJKE PHILIPS NV