Photon-Counting CT Detector Voltage Compensation Under High X-Ray Dose
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Solution Overview
Problem
The photon counting type X-ray detector in CT scans is prone to voltage drops due to large currents from high X-ray doses, leading to potential artifacts and breakdowns, which are difficult to prevent with conventional designs.
Innovation Solution
The X-ray CT apparatus identifies target elements within the detector that experience high currents using advanced identification functions, and compensates for voltage changes by adjusting the number of connected voltage supply devices or altering the electric power supply to these elements, optimizing voltage maintenance during scans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photon counting type X-ray detector is used to maintain image quality at low doses, then measurement precision is improved, but the detector becomes prone to voltage drops and breakdowns due to large currents from high X-ray doses
Solution Approach 1:
The detector is divided into multiple detection elements, each with its own voltage supply device. This segmentation allows independent voltage control for each element, enabling the system to manage current loads more effectively and prevent voltage drops in specific elements without affecting the entire detector array.
Solution Approach 2:
The voltage supply devices are configured to be connectable and disconnectable from the detection elements based on operational requirements. This dynamic connection allows the system to adjust voltage supply in real-time, maintaining stable operation during high-dose scans by connecting additional voltage supply devices to elements experiencing voltage drops.
2Reliability
If voltage supply devices are added to compensate for voltage drops, then detector stability is improved, but device complexity increases
Solution Approach 1:
The voltage supply devices are designed to serve multiple detection elements rather than being dedicated to single elements. Each voltage supply device can be connected to different detection elements depending on operational needs, allowing a smaller number of multi-functional units to replace what would traditionally require many dedicated voltage supply devices.
Solution Approach 2:
The system changes the connection parameters of voltage supply devices dynamically based on the operational state of detection elements. By adjusting which voltage supply devices are connected to which elements based on real-time voltage monitoring, the system optimizes voltage stability without requiring a fixed complex architecture for every possible scenario.
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 effectively prevents voltage drops and maintains stable electric charge acquisition, reducing the risk of artifacts and breakdowns while allowing for efficient operation with reduced apparatus size and cost.
Implementation Method 1
X-ray detection signals can be acquired by applying a voltage to electric charges generated in the semiconductor detector due to incidence of X-rays
Data Source
AI summary
An X-ray CT apparatus according to an embodiment includes: an X-ray detector of photon counting type including a plurality of detection elements and a voltage supply device configured to supply the detection elements with a voltage for reading out electric charges accumulated in the detection elements irradiated with X-rays; and processing circuitry configured to identify a target element from among the detection elements based on information acquired in advance, the target element causing a large current to flow through a circuit between the target element and the voltage supply device and compensate for a change of the voltage supplied from the voltage supply device to the target element.