Continuous Tomographic Image Reconstruction via Angular Integration
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Solution Overview
Problem
Conventional tomographic image reconstruction methods, especially in continuous acquisition modes, suffer from blurring and reduced resolution due to angular integration of X-ray beams, which limits acquisition time and image quality.
Innovation Solution
A continuous tomographic image acquisition and reconstruction method where the X-ray source, object, and detector move relative to each other along a predefined path during exposure, integrating X-ray beams continuously and using algorithms like Simultaneous Iterative Reconstruction Technique (SIRT) or Filter-Backprojection (FBP) to model these continuous projections, thereby improving image quality and reducing streak artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous acquisition mode is used with conventional reconstruction algorithms, then acquisition time is reduced, but image quality deteriorates due to blurring from angular integration
Solution Approach 1:
The patent changes the fundamental parameter of how projections are acquired - from discrete step-and-shoot measurements to continuous angular integration during rotation. This parameter change enables the system to capture all angular information simultaneously, resolving the contradiction by allowing fast acquisition without angular integration blurring, since the continuous model explicitly accounts for the integration effect.
Solution Approach 2:
The patent transitions from static step-and-shoot acquisition to dynamic continuous acquisition during source rotation. By modeling the continuous angular integration that occurs during rotation, the system can maintain high acquisition speed while recovering image resolution through algorithms like SIRT or FBP that are adapted to handle continuous projection data.
2Device complexity
If step-and-shoot protocol is used, then image reconstruction is simpler, but acquisition time increases
Solution Approach 1:
The patent implements continuous acquisition where the X-ray source rotates continuously and integrates projections over the entire rotation angle. This continuous action captures all necessary angular information in a single rotation, dramatically reducing acquisition time compared to step-and-shoot while the reconstruction algorithms (SIRT, FBP) handle the continuous data model efficiently.
3Manufacturing precision
If short exposure time and low rotation speed are used, then angular integration is limited, but acquisition time increases
Solution Approach 1:
The patent changes the exposure strategy from short discrete exposures to continuous integration throughout the rotation. This parameter change allows the system to use longer effective integration times without increasing acquisition time, because the continuous model captures all angular information simultaneously during a single rotation rather than requiring multiple discrete measurements.
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
This approach enhances reconstruction image quality near the rotation center, increases acquisition speed, and reduces streak artifacts compared to step-and-shoot protocols while maintaining equal total radiation dose and number of projections.
Implementation Method 1
detecting the X-ray projection images by means of a radiation detector
Implementation Method 2
a flat panel detector is used to capture the X-rays
Implementation Method 3
A 3D image of the patient is then computed by applying a tomographic reconstruction algorithm to the acquired digital X-ray projection images
Data Source
AI summary
A computerized tomographic image exposure and reconstruction method wherein an object is subjected to irradiation during a relative movement of a source of radiation, the object, and a radiation detector and wherein a digital representation of the radiation image of the object is computed by applying a tomographic reconstruction algorithm to image data read out of the irradiated radiation detector. A number of projection images are generated, each of the projection images being generated by integrating X-ray beams continuously emitted during the relative movement through a predefined movement path, and the created projection images are modeled in a tomographic reconstruction algorithm.