CT Imaging Scatter Correction via Pre-computed Attenuation Values
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Solution Overview
Problem
Computed tomography images are compromised by image artifacts caused by scatter effects, leading to reduced image quality.
Innovation Solution
An imaging apparatus and method that includes a radiation source, detector, attenuation element, and correction units to measure and correct detection values based on attenuation element and object scatter values, using algorithms and simulations to improve image quality by accounting for radiation scattering in both the attenuation element and the object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If radiation scattering in the attenuation element is not corrected, then the device complexity is low, but the image quality deteriorates due to artifacts
Solution Approach 1:
The patent applies preliminary action by pre-calculating scatter values for the attenuation element using simulation methods before actual imaging. These pre-computed scatter correction values are then applied during image reconstruction, eliminating the need for complex real-time scatter measurement systems while improving image quality
Solution Approach 2:
The patent uses simulation to create a virtual model of the attenuation element's scatter behavior. This virtual copy of the scatter effects is then subtracted from the actual detection values, providing correction without requiring physical measurement devices
2Manufacturing precision
If scatter correction is applied, then the image quality improves, but the processing time increases
Solution Approach 1:
Scatter correction values are pre-computed using simulation methods before actual imaging takes place. This preliminary calculation allows rapid application of corrections during image reconstruction without adding significant processing time to the imaging workflow
Solution Approach 2:
The patent transforms the complex scatter correction problem into a parameter-based solution by pre-determining scatter values as functions of position and geometry. These parameterized correction values can be efficiently applied during reconstruction, reducing computational burden
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively corrects detection values to enhance the quality of reconstructed images by accurately accounting for scatter effects, thereby improving image fidelity and reducing artifacts.
Implementation Method 1
an attenuation element for attenuating the radiation before traversing the region of interest
Implementation Method 2
attenuation element scatter values, which depend on scattering of the radiation caused by the attenuation element
Data Source
AI summary
The present invention relates to an imaging apparatus for generating an image of a region of interest of an object. The imaging apparatus comprises a radiation source (2) for emitting radiation (4) and a detector (6) for measuring the radiation (4) after having traversed the region of interest and for generating measured detection values depending on the measured radiation (4). The imaging apparatus further comprises an attenuation element for attenuating the radiation (4) before traversing the region of interest and an attenuation element scatter values providing unit (12) for providing attenuation element scatter values, which depend on scattering of the radiation (4) caused by the attenuation element. A detection values correction unit (17) corrects the measured detection values based on the provided attenuation element scatter values, and a reconstruction unit (18) reconstructs an image of the region of interest from the corrected detection values.