Extending CT Field of View for Accurate Tissue Dose Estimation
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Solution Overview
Problem
Current methods for computing the radiation dose in CT scans inaccurately estimate the dose outside the reconstructed field of view due to incomplete anatomical information, leading to potential organ damage from scatter radiation.
Innovation Solution
The method extends the field of view by registering and combining previously acquired image data or anatomical atlas data with initial image data to estimate the dose more accurately, incorporating additional tissue outside the original field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the field of view is limited to the reconstructed FOV, then the image data processing is simpler and faster, but the dose estimation accuracy deteriorates due to missing anatomical information outside the FOV
Solution Approach 1:
The patent applies preliminary action by pre-acquiring low-resolution anatomical data covering a larger field of view before the actual CT scan. This pre-acquired data is then used to extend the FOV for dose estimation, eliminating the need to process complete high-resolution image data and thereby reducing computational complexity while maintaining accurate dose estimation.
2Measurement precision
If previously acquired image data is repeated to estimate the region outside the FOV, then the processing is simpler, but the anatomical accuracy deteriorates leading to inaccurate dose estimates
Solution Approach 1:
The patent applies local quality by using different data sources for different spatial regions: high-resolution reconstructed image data is used within the FOV where accurate anatomical detail is needed, while low-resolution previously acquired image data is used outside the FOV where the primary need is to capture overall anatomical structure for dose estimation. This regional differentiation optimizes both accuracy and processing efficiency.
3Measurement precision
If the field of view is extended using anatomical atlas data, then the anatomical information outside FOV is improved, but the subject-specific accuracy may deteriorate
Solution Approach 1:
The patent uses previously acquired low-resolution image data of the same subject as an intermediary between the high-resolution reconstructed data and the anatomical atlas data. This intermediary provides subject-specific anatomical information that bridges the gap between generic atlas data and the specific subject's anatomy, thereby maintaining both general anatomical accuracy and subject-specific adaptability.
Data Source
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AI summary
A method for extending initial image data of a subject for dose estimation includes obtaining first image data of the subject for dose calculation, wherein the first image data has a first field of view. The method further includes obtaining second image data for extending the field of view of the first image data. The second image data has a second field of view that is larger than the first field of view. The method further includes extending the first field of view based on the second image data, producing extended image data.