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dark field imaging

A dark-field imaging and dark-field image technology, which is applied in image generation, image acquisition, image data processing, etc., can solve the problems of increasing the complexity and cost of dark-field imaging systems

Active Publication Date: 2017-10-27
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Unfortunately, in order to rotate source 102, gratings 108, 110, and 112, and detector array 104, an imaging system must include at least: a rotating frame that supports source 102, detectors, and gratings 108, 110, and 112; A rotating frame, belts, chains, fixed frame and bearings supported by a magnetic or other drive system with motors and controllers for rotating said rotating frame; and one or more encoders for determining angular position information, etc. , which adds complexity and expense to the overall dark-field imaging system

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Embodiment Construction

[0026] refer to Figure 4 , schematically illustrates an imaging system 400 comprising a scanner 401 configured for at least 3D dark field imaging. Scanner 401 includes a radiation source 402 (eg, an X-ray tube) having a focal spot 404 that emits radiation through an examination region 406 and an object 417 or objects therein. A radiation sensitive detector array 408 is positioned opposite the radiation source 402 across the examination region 406 . A radiation sensitive detector array 408 detects radiation passing through the examination region 406 and generates signals indicative thereof, including dark field signals in combination with dark field imaging.

[0027] The X-ray imaging interferometer comprises three grating structures: a source grating 410 , a phase grating 412 and an absorber grating 414 . Source grating 410, phase grating 412, and absorber grating 414 each have a grating rule period and are separated by some distance, for example, as in application number 1...

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Abstract

A method for dark-field imaging includes acquiring dark-field image projections of an object with an imaging apparatus that includes an x-ray interferometer, applying a pressure wave having a predetermined frequency to the object for each acquired projection, wherein the predetermined frequency is different for each projection, and processing the acquired projections, thereby generating a 3D image of the object. In other words, the method corresponds to acoustically modulated X-ray dark field tomography. An imaging system (400) includes a scanner (401) configured for dark-field imaging, the scanner including: a source / detector pair (402 / 408) and a subject support (416), a pressure wave generator (420) configured to generate and transmit pressure waves having predetermined frequencies, and a console (424) that controls the scanner and the pressure wave generator to acquire at least two dark-field projection of an object with different pressure waves having different frequencies applied to the object.

Description

technical field [0001] The following generally refers to dark field imaging of dark fields and is described with a specific application to computed tomography (CT). Background technique [0002] In conventional CT imaging, contrast is obtained by differences in the absorption cross-sections of the components of the object being scanned. This yields good results when a highly absorbent structure such as bone is embedded in a matrix of relatively weakly absorbent material such as the surrounding tissue of the human body. However, if a different form of tissue with a similar absorption cross-section is under investigation (eg mammography or angiography), the X-ray absorption contrast is relatively poor. Therefore, distinguishing pathological tissue from non-pathological tissue in absorption radiographs obtained with current hospital-based X-ray systems remains difficult for certain tissue compositions. [0003] Darkfield (or grating-based differential phase contrast) imaging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/04G06T11/00A61B6/03
CPCA61B6/4035A61B6/4291A61B6/484A61B6/486A61B6/5205G01N23/046G01N2223/419G01N2223/612G06T1/0007G06T11/006A61B6/032G06T2200/04G06T2210/41G06T2211/424
Inventor R·普罗克绍
Owner KONINKLJIJKE PHILIPS NV