PCCT Projection Data Compression Across Energy Bands
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Solution Overview
Problem
The challenge of efficiently transmitting projection data of three or more energy bands in photon counting computed tomography (PCCT) systems while ensuring reproducibility, due to the high data transmission difficulty of slip rings compared to conductive wires.
Innovation Solution
A data processing system that includes a first data processing apparatus to derive and transmit compressed projection data with reduced resolution for one energy band, and a second apparatus to restore the compressed data using relationships with other energy bands, ensuring efficient transmission and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If projection data of all energy bands is transmitted at full resolution, then image quality and reproducibility are maintained, but data transmission burden increases significantly
Solution Approach 1:
The patent applies local quality by differentiating resolution requirements across different energy bands. Specifically, the first projection data (lower energy band) is transmitted at reduced resolution, while the second projection data (higher energy band) is transmitted at full resolution. This selective resolution approach maintains overall image quality and reproducibility while significantly reducing the total data transmission burden.
2Productivity
If projection data is compressed to reduce transmission data amount, then transmission efficiency improves, but data reproduction accuracy deteriorates
Solution Approach 1:
The patent uses an intermediary approach by introducing a third energy band's projection data as a mediator to restore the first projection data that was transmitted at reduced resolution. The restoration process combines the third projection data with the compressed first projection data to reconstruct the original high-resolution first projection data, thereby maintaining data reproduction accuracy while achieving transmission efficiency through initial compression.
3Quantity of substance
If resolution of projection data for one energy band is reduced, then data transmission volume decreases, but image quality for that energy band deteriorates
Solution Approach 1:
The patent applies merging by combining projection data from multiple energy bands during the restoration process. The first projection data (transmitted at reduced resolution) is restored by merging it with the third projection data (another energy band transmitted at full resolution). This combination allows the system to achieve both reduced data transmission volume and maintained image quality through the synergistic use of multiple energy band datasets.
Data Source
AI summary
A data processing system includes a first data processing apparatus that processes projection data from a photon counting detector, and a second data processing apparatus. The first data processing apparatus derives at least one piece of first compressed projection data by making resolution of first projection data of at least one energy band among a plurality of pieces of projection data lower than resolution of projection data of a plurality of other energy bands, and transmits the first compressed projection data and the projection data of other energy bands to the second data processing apparatus. The second data processing apparatus acquires the first compressed projection data and the projection data of the plurality of other energy bands, and derives first restored projection data by restoring the first compressed projection data based on the projection data of the plurality of other energy bands and the first compressed projection data.