Hybrid X-ray CT Detector System for Spectral Imaging
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Solution Overview
Problem
Current CT scanners face limitations in utilizing true spectral information due to high costs and performance constraints of photon counting detectors, particularly in high flux x-rays, and struggle with beam hardening, temporal resolution, noise balance, and energy separation, restricting the implementation of spectral CT systems beyond dual-energy approaches.
Innovation Solution
An X-ray computer tomography apparatus that combines energy integrating detectors for full views of intensity data with photon counting detectors for sparse views of spectral data, using an iterative reconstruction algorithm to reconstruct images, which reduces the need for high-cost photon counting detectors and minimizes artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photon counting detectors are used to acquire spectral data, then spectral information and energy separation are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines photon counting detectors (for spectral information) with energy integrating detectors (for intensity data) in a single CT scanner system. The photon counting detector acquires spectral data while the energy integrating detector simultaneously acquires intensity data, merging the advantages of both detector types to obtain comprehensive spectral and intensity information without requiring solely expensive photon counting detectors for all measurements.
Solution Approach 2:
The detection system is segmented into two functional parts: photon counting detectors that handle spectral data acquisition and energy integrating detectors that handle intensity data acquisition. This segmentation allows each detector type to operate in its optimal regime, with photon counting providing spectral information and energy integrating providing robust intensity measurements, thereby reducing overall system complexity compared to using only photon counting detectors.
2Reliability
If photon counting detectors are used for spectral CT, then beam hardening correction is improved, but temporal resolution deteriorates
Solution Approach 1:
The system merges photon counting detectors with energy integrating detectors to achieve both beam hardening correction and temporal resolution. The photon counting detectors provide spectral information for beam hardening correction while the energy integrating detectors provide rapid intensity measurements that maintain temporal resolution, overcoming the limitation of photon counting detectors alone.
3Measurement precision
If photon counting detectors are used for spectral CT, then energy separation is improved, but noise balance deteriorates
Solution Approach 1:
The patent merges photon counting detectors with energy integrating detectors to achieve both energy separation and noise balance. The photon counting detectors provide spectral information for energy separation while the energy integrating detectors provide noise-balanced intensity measurements, compensating for the noise issues inherent in photon counting detectors alone.
4Measurement precision
If photon counting detectors are used for spectral CT, then spectral information is improved, but spatial resolution deteriorates
Solution Approach 1:
The system merges photon counting detectors with energy integrating detectors to achieve both spectral information and spatial resolution. The photon counting detectors provide spectral data while the energy integrating detectors maintain high spatial resolution through their established detection capabilities, overcoming the spatial resolution limitations of photon counting detectors alone.
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 approach enhances image reconstruction by integrating spectral and intensity data, improving spatial and temporal resolution while reducing beam hardening artifacts and increasing accuracy, enabling more advanced spectral techniques without the tradeoffs of prior art solutions.
Implementation Method 1
at least one X-ray tube generating X-rays
Implementation Method 2
first detector elements of an energy integrating type, detecting an intensity of X-rays generated from the X-ray tube and transmitted through an object
Implementation Method 3
second detector elements of a photon counting type detecting a spectrum of X-rays generated from the X-ray tube and transmitted through the object
Data Source
AI summary
An X-ray computer tomography apparatus includes at least one X-ray tube generating X-rays, first detector elements (energy integrating type) and second detector elements (photon counting type) detecting an intensity and spectrum of the X-rays transmitted through the object respectively, at least one data acquisition circuit acquiring first projection data and second projection data smaller in data amount than the first projection data detected by the first and second detector elements respectively, an arithmetic circuit computing a minimum value of a cost function based on the first and second projection data by executing an iterative reconstruction algorithm, and reconstruction circuit reconstructing an image of the object based on the first and second projection data, which correspond to the minimum value of the cost function.