Low-Dose 3D Medical Imaging Resolution Control
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Solution Overview
Problem
Conventional low-dose radiation imaging techniques face challenges in accurately representing three-dimensional structures due to superposition of structures in two-dimensional images, leading to potential misdiagnosis in medical imaging, particularly in mammography, where high resolution displays can introduce artifacts and increase false positives and negatives.
Innovation Solution
The method involves obtaining projection data from a limited number of view angles to reconstruct 3D images at a resolution that matches the actual data, and then displaying the images at a reduced resolution to suppress artifacts, using techniques such as maximum intensity value or root mean square transformations to maintain high-frequency information and ensure that only data-supported variations are displayed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CT techniques are used to obtain 3D volume images, then image resolution and diagnostic information are improved, but radiation dose and exposure time increase significantly
Solution Approach 1:
The patent applies partial action by acquiring projection data from a limited number of view angles (e.g., 15-30 angles) rather than the hundreds or thousands of angles used in conventional CT. This partial sampling approach achieves sufficient diagnostic information for many applications while dramatically reducing radiation dose and exposure time, resolving the contradiction between image quality and radiation exposure
Solution Approach 2:
The patent changes key parameters of the imaging process: reducing the number of view angles from hundreds/thousands to 15-30, and reconstructing images at lower resolutions (e.g., 128x128 or 256x256 pixels) rather than high resolutions. These parameter changes enable acceptable diagnostic quality at significantly reduced radiation doses
2Measurement precision
If projection data is reconstructed at high resolution, then image detail is improved, but artifacts increase and diagnostic accuracy decreases
Solution Approach 1:
The patent changes the resolution parameter by reconstructing images at lower resolutions (128x128 or 256x256 pixels) rather than high resolutions. This parameter change suppresses artifacts that occur with limited-angle reconstruction while preserving the diagnostic information needed for accurate diagnosis, thereby improving reliability
Solution Approach 2:
The patent replaces the conventional approach of using high-resolution display with artifact suppression techniques through optimized reconstruction algorithms and appropriate resolution selection. This substitution eliminates artifacts without requiring higher radiation doses or more complex hardware
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 reduces the likelihood of misinterpretation by limiting the display of artifacts, enhancing diagnostic accuracy and reducing unnecessary procedures, while adhering to safety constraints by minimizing radiation exposure.
Implementation Method 1
X-rays from a source passing through the object interact with the internal structures of the object and are altered according to various characteristics of the material (e.g., transmission, scattering and diffraction characteristics, etc.) which the x-rays encounter. By measuring changes in the x-ray radiation (e.g., attenuation, modifications to the energy spectrum, scatter angle, etc.) that exits the object, information related to characteristics of the material, such as the density distribution, may be obtained.
Data Source
AI summary
In one aspect, a method of displaying data is provided. The method comprises obtaining projection data of an object by exposing an object to radiation at a plurality of view angles and detecting at least some of the radiation exiting the object to form the projection data, operating a computer to reconstruct the projection data at a reconstruction resolution to form image data comprising a plurality of voxels representing locations within the object, each of the plurality of voxels being assigned an associated intensity indicative of a density of the subject matter at the respective location, determining a maximum resolution for display, above which variation in intensity between adjacent voxels is not supported by information in the projection data, the maximum resolution being less than the reconstruction resolution, and displaying the image data at or below the maximum resolution.