Scanned Object Contour Estimation for Accurate DFOV Setting
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Solution Overview
Problem
Existing medical imaging systems face challenges in accurately setting a display field of view (DFOV) to cover the entire contour of a scanned object without compromising image resolution, especially when truncation occurs due to obesity, misalignment, or special poses, leading to incomplete image reconstruction.
Innovation Solution
An imaging system and method that includes a positioning image acquisition unit, contour estimation unit, and display field of view determination unit to estimate the object's contour using polynomial fitting, neural networks, and preliminary reconstruction, ensuring the DFOV encompasses the entire object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If image reconstruction with a DFOV larger than the SFOV is performed to cover the entire scanned object, then complete information coverage is achieved, but the image resolution decreases
Solution Approach 1:
The system performs preliminary contour estimation on positioning images before the main image reconstruction process. By estimating the object contour in advance and using it to determine an appropriate DFOV, the system avoids the need to use an excessively large DFOV that would compromise resolution, thus resolving the contradiction between coverage and resolution.
Solution Approach 2:
The system dynamically adjusts the DFOV parameter based on the estimated object contour from positioning images. Instead of using a fixed or excessively large DFOV, the system optimizes the DFOV size to match the actual object dimensions, thereby maintaining both complete coverage and high image resolution.
2Measurement precision
If the SFOV is reduced to improve image resolution, then resolution is improved, but the scanned object may not be fully covered
Solution Approach 1:
The system performs preliminary contour estimation on positioning images before the main image reconstruction process. By estimating the object contour in advance and using it to determine an appropriate DFOV, the system avoids the need to use an excessively large DFOV that would compromise resolution, thus resolving the contradiction between coverage and resolution.
Solution Approach 2:
The system dynamically adjusts the DFOV parameter based on the estimated object contour from positioning images. Instead of using a fixed or excessively large DFOV, the system optimizes the DFOV size to match the actual object dimensions, thereby maintaining both complete coverage and high image resolution.
3Area of stationary object
If the DFOV is increased to cover obese patients or misaligned objects, then complete coverage is achieved, but the image resolution decreases
Solution Approach 1:
The system performs preliminary contour estimation on positioning images before the main image reconstruction process. By estimating the object contour in advance and using it to determine an appropriate DFOV, the system avoids the need to use an excessively large DFOV that would compromise resolution, thus resolving the contradiction between coverage and resolution.
Solution Approach 2:
The system dynamically adjusts the DFOV parameter based on the estimated object contour from positioning images. Instead of using a fixed or excessively large DFOV, the system optimizes the DFOV size to match the actual object dimensions, thereby maintaining both complete coverage and high image resolution.
Data Source
AI summary
Described herein are an imaging system and method. Specifically, the imaging system includes a positioning image acquisition unit configured to acquire positioning images of a scanned object from a plurality of angles, a contour estimation unit configured to estimate a contour of the object in each positioning image in a scanning direction when truncation is present in at least one positioning image, and a display field of view determination unit configured to select a maximum value of an estimated contour as a display field of view of the image. A contour of a scanned object in each positioning image in a scanning direction is estimated when truncation is present in at least one positioning image, thereby determining a suitable display field of view. An appropriate display field of view can be set, so that a reconstructed image can cover the entire contour of the object and have a higher resolution.