X-ray Collimator Tapered Holes 2D Source Array
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Solution Overview
Problem
Existing x-ray collimation methods are ineffective for collimating x-rays emanating from a two-dimensional array of micrometer scale x-ray sources, leading to reduced image quality due to scattered photons.
Innovation Solution
A collimator with a substrate containing tapered holes of high aspect ratio, aligned with a two-dimensional array of x-ray sources, which emit x-ray photons in a narrow angle cone, and multiple collimators can be arranged in series to extend the collimation length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anti-scatter grids are used to block scattered photons, then image quality improves, but they are ineffective for two-dimensional arrays of micrometer scale x-ray sources
Solution Approach 1:
The collimator is divided into multiple substrates arranged in series, with each substrate containing an array of holes that corresponds to a specific region of the 2D x-ray source array. This segmentation allows each substrate to be optimized for its specific region while collectively handling the entire 2D source array, resolving the contradiction between maintaining image quality and adapting to 2D source configurations.
Solution Approach 2:
The invention transitions from conventional 2D anti-scatter grids to a 3D multi-substrate collimation system. By stacking multiple substrates in series along the beam path, the system adds a depth dimension to the collimation structure, enabling effective collimation for 2D source arrays that cannot be achieved with planar grids alone.
2Reliability
If multiple collimator substrates are arranged in series to extend collimation length, then scattered photon reduction improves, but device complexity increases
Solution Approach 1:
Multiple collimator substrates are merged into a single integrated collimation system where each substrate contributes to the overall collimation function. The substrates work together in series to progressively filter scattered photons, achieving superior scattered photon reduction while maintaining a relatively simple modular structure that can be manufactured and assembled using standard techniques.
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 solution effectively reduces scattered x-ray photons, improving image quality by controlling the x-ray output angle and distribution on an emitter basis, resulting in a more focused and clear x-ray image.
Implementation Method 1
A collimator with a substrate containing tapered holes of high aspect ratio, aligned with a two-dimensional array of x-ray sources, which emit x-ray photons in a narrow angle cone
Implementation Method 2
x-ray collimators have comprised a two dimensional grid, sometimes also known as an anti-scatter grid (ASG), which is positioned directly in front of the sensor and serves to absorb or block photons emanating with a large angle
Data Source
AI summary
An x-ray collimator that may include a substrate containing a plurality of holes, each hole being frustoconical at one end and tubular at the other end for use in an x-ray imaging system, whereby the x-ray collimator may be aligned with a two-dimensional array of x-ray sources and a two-dimensional x-ray sensor, and whereby x-ray photons from the x-ray sources may pass through the collimator holes and emerge as a beam of x-ray photons in a narrow angle cone which may pass through a subject being imaged, positioned between the output holes of the collimator and the x-ray sensor.