Tomographic Imaging with Random Phase Coherent Light
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Solution Overview
Problem
Conventional tomographic imaging techniques require numerous shots and a long time to reconstruct 3-D images due to the need for multiple illumination angles, making it inefficient for rapid image acquisition.
Innovation Solution
An apparatus utilizing coherent light with random phase distribution, a coupler for interference between object and reference light, a shifter for phase difference adjustment, and a processor for calculating optical propagation to facilitate faster 3-D image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi angle scanning is used to reconstruct 3-D images, then the quality of reconstructed images is improved, but the number of shots required increases significantly
Solution Approach 1:
The invention changes the parameter of light phase distribution from conventional uniform or controlled phases to random phase distribution. This parameter change allows the system to capture complete 3-D information in a single shot while maintaining image reconstruction quality, thereby resolving the contradiction between image quality and acquisition time
Solution Approach 2:
The invention performs preliminary encoding of 3-D information into the random phase distribution of the illumination light before it reaches the object. This preliminary action embeds all necessary angular and depth information in the illumination pattern, enabling single-shot capture without requiring subsequent multi-angle scanning
2Loss of information
If many illumination angles are used for 3-D reconstruction, then the completeness of 3-D information is improved, but the complexity of the imaging system increases
Solution Approach 1:
The invention extracts the function of multi-angle scanning by encoding angular information into the random phase distribution of the illumination light. Instead of physically moving the light source to multiple angles, the system extracts and embeds angular information in the spatial phase pattern, thereby completing 3-D information acquisition without complex mechanical scanning systems
Solution Approach 2:
The random phase distribution pattern serves multiple functions simultaneously: it provides illumination, encodes angular information, and contains depth encoding information. This multi-functionality eliminates the need for separate systems for each function, reducing overall system complexity while maintaining information completeness
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
Enables the acquisition of 3-D images in less time by reducing the number of required shots and processing steps, thus enhancing the efficiency of tomographic imaging.
Implementation Method 1
a coupler which combines a reference coherent light and an object light which is from the light unit and passed through the object, the reference coherent light and the object light being interfered
Data Source
AI summary
The present invention provides an apparatus for tomographic imaging of an object. The apparatus includes a light unit configured to generate illumination, which comprises coherent light and has random phase distribution in a plane perpendicular to an optical axis, for illuminating an object, a coupler which combines a reference beam and an object beam for an interference, a shifter configured to shift relative phase difference between the object light and the reference coherent light, a detector configured to detect an interference caused by the reference coherent light and object light for the each phase, and a processor configured to calculate an optical propagation based on the detected interference for the each phase.