Bi-Plane Tomographic Imaging System for Artifact Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tomographic imaging technologies face challenges such as artifacts and imperfections due to incomplete data sets, particularly in X-ray computed tomography systems, which can be time-consuming and invasive, and may expose patients to excessive X-rays.
Innovation Solution
A bi-plane tomographic imaging system is implemented, utilizing two X-ray imagers positioned crosswise, with one imager moving along a non-linear trajectory and the other providing complementary data to synthesize volumetric images using tomosynthesis, reducing the need for extensive patient exposure and invasive procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single X-ray imager performs tomographic acquisition, then the device complexity is lower, but the image quality deteriorates due to incomplete data and artifacts
Solution Approach 1:
The imaging system is divided into two separate X-ray imagers (first and second imagers) positioned at different orientations. Each imager independently acquires projection data from different angular ranges, segmenting the complete data acquisition task to eliminate artifacts while maintaining reasonable system complexity
Solution Approach 2:
The system transitions from single-plane to bi-plane imaging by adding a second imager oriented perpendicular to the first. This dimensional expansion allows simultaneous acquisition of projection data from two different spatial dimensions, completing the data set and eliminating truncation artifacts
2Loss of information
If complete scan data is obtained using traditional methods, then image completeness is improved, but the scan time increases
Solution Approach 1:
The two imagers operate simultaneously and continuously during the acquisition process, collecting projection data from different angular ranges at the same time. This parallel continuous acquisition completes the data set faster than sequential single-imager methods, reducing scan time while maintaining data completeness
Solution Approach 2:
Each imager acquires projection data over a limited angular range (e.g., 90-180 degrees) rather than requiring a full 360-degree rotation. This partial action from each imager, when combined, provides sufficient data for artifact-free reconstruction without the time penalty of complete rotational coverage
3Loss of information
If traditional X-ray CT is used for imaging, then complete volumetric data is obtained, but patient exposure to X-rays increases
Solution Approach 1:
The system acquires projection data over a limited angular range (90-180 degrees) using two imagers instead of requiring 360-degree rotation. This partial action provides sufficient data for volumetric reconstruction while reducing the total X-ray exposure dose to the patient
Solution Approach 2:
The system uses periodic tomosynthesis acquisitions at multiple focal depths rather than continuous CT scanning. This periodic action at selected planes reduces cumulative X-ray exposure while maintaining adequate data completeness for diagnostic imaging
4Ease of operation
If a single imager performs acquisition, then the system is simpler to operate, but the acquisition completeness deteriorates
Solution Approach 1:
The system merges data from two independently operated imagers into a single complete data set. The imaging control system automatically integrates projection data from both imagers, maintaining operational simplicity while achieving complete angular coverage that neither imager could achieve alone
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 image quality by reducing artifacts, shortening scan times, and minimizing patient exposure to X-rays, while allowing for more efficient and less disruptive imaging during interventional procedures.
Implementation Method 1
moving the first X-ray source along a first trajectory about the imaged volume while obtaining first X-ray attenuation data of the imaged volume via a first acquisition
Implementation Method 2
obtain second X-ray attenuation data of the imaged volume using the second X-ray source and the second X-ray detector
Implementation Method 3
synthesize a volumetric image from the first X-ray attenuation data using tomosynthesis and the second X-ray attenuation data
Data Source
AI summary
A method includes, in a bi-plane interventional imaging system, moving a first C-arm supporting a first X-ray source and a first X-ray detector about first and second axes while obtaining a plurality of first X-ray attenuation data sets relating to a subject of interest; moving a second C-arm, positioned crosswise with respect to the first C-arm and supporting a second X-ray source and a second X-ray detector, about the first axis while obtaining a plurality of second X-ray attenuation data sets relating to the subject of interest; and synchronizing the movement of the first and second C-arms to avoid collision therebetween.