Radiographic Apparatus Target Array Shielding Penumbra Control
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Solution Overview
Problem
Radiographic apparatuses with multiple targets and shielding members suffer from penumbra formation, leading to image blurring and instability due to the leakage of X-ray beams outside the main exposed region, which compromises image quality and usability.
Innovation Solution
A radiographic apparatus design featuring a target array with sloping partitions that separate adjacent targets and an electron emitting source, along with a shielding portion on the X-ray detecting unit, effectively reduces penumbra leakage by optimizing the height and width of the shielding members to maintain stability and improve image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the height of partitions in the shielding member unit is increased to reduce penumbra, then image quality improves, but the apparatus becomes unstable and prone to image blurring
Solution Approach 1:
The shielding member is divided into multiple partitions (first partition, second partition, third partition) with different heights and positions. Each partition selectively blocks X-rays from specific targets in different directions, allowing precise control of penumbra without requiring a single tall shielding structure that would compromise stability.
Solution Approach 2:
Different regions of the shielding member have different shielding characteristics. The first partition has a specific height to block X-rays from the first target, the second partition has a different height for the second target, and the third partition has yet another height for the third target. This local differentiation allows optimal penumbra control for each beam path while maintaining overall apparatus stability.
2Manufacturing precision
If a single tall shielding member is used to reduce penumbra leakage, then X-ray beam control improves, but the center of gravity rises and image blurring occurs
Solution Approach 1:
Instead of one tall shielding member, the shielding function is segmented into multiple shorter partitions distributed across different positions. Each partition is optimized for its specific location and targets, achieving effective X-ray beam control without concentrating mass at a high center of gravity, thus preventing image blurring.
Solution Approach 2:
The shielding approach transitions from a single vertical dimension (one tall partition) to a multi-dimensional arrangement where multiple partitions of varying heights are distributed spatially. This distributes the shielding function across different positions and heights, achieving beam control without the stability issues of a single tall structure.
3Manufacturing precision
If the focal spot diameter is reduced to improve resolution, then image resolution improves, but heat resistance of the target deteriorates
Solution Approach 1:
The X-ray generation function is segmented across multiple targets with their own focal spots. While each focal spot maintains a practical size for heat dissipation, the segmentation of the overall beam into multiple targeted beams achieves effective resolution through precise spatial control and selective shielding rather than relying solely on ultra-small focal spots.
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
The solution effectively reduces penumbra leakage, enhances image resolution, and maintains apparatus stability, thereby improving imaging performance and usability by controlling the focal spot diameter and shielding member configuration.
Implementation Method 1
an electron emitting source that emits electron beams to electron incident surfaces of the plurality of targets, respectively
Implementation Method 2
a target array that includes a plurality of targets arrayed in a line... the X-ray generating unit forms a main exposed area and a penumbra area on the X-ray detecting unit
Implementation Method 3
a shielding portion provided on an outer side of the detecting portion along an array direction in which the targets are arrayed in a line... effectively reduces penumbra leakage
Data Source
AI summary
A radiographic apparatus includes a target array and an X-ray detecting unit. The target array includes a plurality of targets and a forward shielding member. The X-ray detecting unit includes a detecting portion. The X-ray detecting unit further includes a shielding portion extending toward an outer side of the detecting portion along an array direction in which the targets are arrayed.