Rotating Beam Stop Array for Medical Imaging Error Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In medical imaging, the concentration of errors at fixed positions due to beam stop arrays reduces imaging quality, as cubic spline interpolation inaccurately estimates scatter distributions.
Innovation Solution
A medical imaging apparatus with a beam stop array featuring stop elements distributed in rows perpendicular to the rotation axis, where the number of stop elements is less than or equal to a preset number, and their density varies, particularly higher near the peripheral edges, to minimize shadow areas and error distribution in slice images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a beam stop array is arranged between the imaging source and the target object to block beam, then scatter signals can be blocked and image quality can be improved, but errors concentrate at fixed positions which reduces imaging quality
Solution Approach 1:
The beam stop array is rotated together with the imaging source around the rotation axis during the imaging process. This dynamic rotation causes the shadow areas and errors to move to different positions in different slice images, preventing error concentration at fixed positions while maintaining the scatter blocking function
Solution Approach 2:
The invention transforms the static beam stop array configuration into a dynamic one by adding rotational motion around the rotation axis. This introduces a temporal dimension to the error distribution, spreading errors across multiple spatial positions over time, thereby converting fixed-position errors into distributed errors
2Object-affected harmful factors
If the number of stop elements in the beam stop array is increased to improve scatter blocking, then more scatter signals can be blocked, but the complexity of the device increases
Solution Approach 1:
The invention optimizes the distribution parameters of stop elements, setting their density to gradually increase from the center to the periphery of the beam stop array. This parameter optimization allows effective scatter blocking with a limited number of elements, reducing device complexity while maintaining performance
Solution Approach 2:
Different regions of the beam stop array have different densities of stop elements, with higher density at the periphery and lower density at the center. This local quality variation optimizes the blocking efficiency for different spatial frequencies of scatter signals while minimizing the total number of elements required
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 configuration reduces shadow areas and error distribution in slice images, thereby improving overall imaging quality and ensuring more accurate representation of the target object.
Implementation Method 1
a beam stop array (BSA) is arranged between the imaging source and the target object to block beam in a linear direction
Data Source
AI summary
Embodiments of the present disclosure provide a medical imaging apparatus and a treatment device. The medical imaging apparatus includes: an imaging source, a beam stop array and a detector; the beam stop array is arranged between the imaging source and the detector; and the beam stop array includes a plurality of stop elements, the plurality of stop elements are distributed in rows in a direction perpendicular to a rotation axis, and the number of the stop elements is less than or equal to a preset number. After image reconstruction is performed using the projection, shadow areas corresponding to each slice image are reduced, errors of the slice image are reduced, and the imaging quality is improved.