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Medical Radiographic Grating Based on Differential Phase Contrast Imaging

A technology of radiography and phase contrast imaging, which can be used in instruments for radiological diagnosis, medical science, mammography, etc., and can solve problems such as loss

Active Publication Date: 2019-08-06
CARESTREAM HEALTH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in conventional medical imaging, only the information of β is recorded and the information of δ is completely lost

Method used

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  • Medical Radiographic Grating Based on Differential Phase Contrast Imaging
  • Medical Radiographic Grating Based on Differential Phase Contrast Imaging
  • Medical Radiographic Grating Based on Differential Phase Contrast Imaging

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no. 1 approach

[0194] For the first embodiment, a conventional (eg, indirect or direct detection) flat panel detector (eg, area (eg, 24x30)) can be used. Alternatively, a single energy photon counting detector can be used. An exemplary DR PCI system may include multiple translation stages that individually or in combination vary: a) the distance L between the multi-slit grating (source grating G0) and phase grating G1; b) gratings G1 and G2 (e.g. , usually set at a distance d between the first Talbot distance); and / or c) select among multiple G1 gratings for positioning (eg, before grating G2). The x-ray tube may be activated once for each examination. At each exposure, the kVp value can be changed and the PCI system geometry (eg, L and d) can be adjusted such that the measured image has enhanced or maximum contrast. Furthermore, the phase shift or silicon (Si) height in the phase grating G1 can be designed such that passing x-rays experience a phase shift of π. Furthermore, the height of...

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Abstract

Embodiments of methods and apparatus are disclosed for obtaining a phase-contrast digital radiographic imaging system and methods for same that can include an x-ray source for radiographic imaging; a beam shaping assembly including a collimator and a source grating, an x-ray grating interferometer including a phase grating, and an analyzer grating; and an x-ray detector, where a single arrangement of the beam shaping assembly, the x-ray grating interferometer and a position of the detector is configured to provide spectral information (e.g. at least two images obtained at different relative beam energies).

Description

technical field [0001] The present application relates generally to digital x-ray imaging methods / systems, and more particularly to methods and / or systems for acquiring multiple image information of an object (eg, medical radiography imaging) using grating-based differential phase contrast imaging techniques. [0002] Background of the invention [0003] Conventional medical x-ray imaging equipment is based on the attenuation of photoelectric absorption when x-rays penetrate the object to be imaged. However, for less absorbent soft tissues, including blood vessels, cartilage, lung and breast tissue, this provides poor contrast to bone images. This low contrast problem in soft tissue can be resolved with phase contrast imaging (PCI) techniques. [0004] The principle of PCI is based on the wave properties of x-rays, where refraction and diffraction properties need to be considered. As electromagnetic waves, x-rays are usually characterized by their frequency, amplitude and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/00
CPCA61B6/482A61B6/484A61B6/502
Inventor P.巴图林M.E.谢菲尔
Owner CARESTREAM HEALTH INC
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