Shadow Aperture Backscatter Radiography for One-Sided Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backscatter radiography techniques suffer from inefficient sensing and image-obscuring noise, requiring long exposure times and expensive scanning apparatus due to the need for either pinhole or scanning beam illumination methods, which limit the dynamic-range and image quality.
Innovation Solution
The Shadow Aperture Backscatter Radiography (SABR) system employs a partially transmissive radiation detector and a shadow aperture with radiation attenuating regions to separate illumination and backscattered radiation signals, allowing for efficient detection of backscattered radiation in shadowed regions, thereby reducing noise and increasing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pinhole or coded aperture is used for illumination, then one-sided imaging is achieved, but sensing efficiency is extremely low and exposure times are long
Solution Approach 1:
The detector surface is segmented into multiple independently controllable regions, allowing selective illumination and detection of different object regions. This enables the system to illuminate only the necessary areas rather than the entire object, dramatically improving sensing efficiency while maintaining one-sided imaging capability.
Solution Approach 2:
The system uses dynamic control of detector regions, activating only the portions needed for current imaging tasks. This dynamic activation pattern improves productivity by reducing the effective detection area and exposure requirements while preserving the one-sided imaging advantage.
2Ease of operation
If pinhole or coded aperture is used for illumination, then one-sided imaging is achieved, but exposure times are substantially long
Solution Approach 1:
By dividing the detector into multiple regions that can be independently controlled, the system illuminates only the specific object regions of interest rather than the entire field. This segmentation reduces the total radiation required and shortens exposure time while maintaining one-sided imaging capability.
3Measurement precision
If scanning pencil or fan beam is used for illumination, then imaging is achieved, but exposure times are long and expensive scanning apparatus is required
Solution Approach 1:
The invention extracts and removes the complex scanning apparatus from the system by using a stationary detector with selectively activated regions. The scanning function is replaced by electronic control of detector regions, eliminating mechanical complexity while maintaining imaging precision.
Solution Approach 2:
The mechanical scanning system is replaced with an electronic control system that activates specific detector regions. This substitution eliminates moving parts and mechanical complexity while achieving the same imaging precision through electronic region selection.
4Ease of operation
If conventional backscatter radiography is used, then one-sided imaging is achieved, but image-obscuring structured noise is introduced
Solution Approach 1:
The detector is segmented into multiple regions that can be independently controlled and processed. This allows the system to selectively activate and process only the regions contributing to the image of interest, reducing structured noise from other areas while maintaining one-sided imaging capability and improving image quality.
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
SABR enables rapid, high-quality imaging of internal structures with reduced noise and increased dynamic-range, achieving equivalent image quality to transmission radiography using backscattered radiation, suitable for one-sided access applications and near-surface imaging.
Implementation Method 1
A shadow aperture having a plurality of radiation attenuating regions and illumination apertures therebetween is disposed between the radiation source and the detector
Implementation Method 2
backscattered radiation from the object is detected by the detector in regions of the detector that are shadowed from the illumination radiation by the attenuation regions of the shadow aperture
Data Source
AI summary
A shadow aperture backscatter radiography (SABR) system includes at least one penetrating radiation source for providing a penetrating radiation field, and at least one partially transmissive radiation detector, wherein the partially transmissive radiation detector is interposed between an object region to be interrogated and the radiation source. The partially transmissive radiation detector transmits a portion of the illumination radiation field. A shadow aperture having a plurality of radiation attenuating regions having apertures therebetween is disposed between the radiation source and the detector. The apertures provide illumination regions for the illumination radiation field to reach the object region, wherein backscattered radiation from the object is detected and generates an image by the detector in regions of the detector that are shadowed by the radiation attenuation regions.