CT Antenna Position Control for Stable Capacitive Data Transfer
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Solution Overview
Problem
The stability of data transmission in CT apparatuses using capacitive coupling methods is compromised due to deformation of the rotating portion over time, leading to changes in the coupling capacitance between the transmitting and receiving antennas, which affects the reliability of data transfer, especially in high-capacity applications like photon counting computed tomography (PCCT).
Innovation Solution
A CT apparatus equipped with a rotational position detection unit, measurement unit, and displacement mechanism to monitor and adjust the relative position of the receiving antenna with respect to the transmitting antenna, using control data to maintain a stable coupling capacitance by displacing the receiving antenna in parallel or orthogonal directions to the rotation axis, thereby stabilizing data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the distance between the transmitting antenna and the receiving antenna is reduced to increase transmission speed, then the transmission speed is improved, but the deformation of the rotating portion has a larger effect on coupling capacitance stability
Solution Approach 1:
The system uses a rotational position detection unit to detect the rotational position of the rotating portion, and a measurement unit to measure the relative relationship between the transmitting and receiving antennas. Based on this feedback information, the displacement mechanism adjusts the position of the receiving antenna in real-time to maintain constant coupling capacitance, resolving the contradiction between transmission speed and stability.
Solution Approach 2:
The displacement mechanism proactively adjusts the position of the receiving antenna based on detected rotational position changes before they significantly impact coupling capacitance. This preliminary adjustment maintains stable data transmission even when the rotating portion deforms over time.
2Reliability
If the receiving antenna is displaced based on measurement values while the rotating portion is rotating, then the stability of data transmission is improved, but it may take time for the receiving antenna to displace and follow the rotation
Solution Approach 1:
The system replaces complex real-time mechanical displacement adjustments with a pre-calculated displacement pattern stored in memory. The displacement control unit simply retrieves and executes the predetermined displacement pattern based on rotational position, eliminating time-consuming real-time calculation and adjustment delays.
Solution Approach 2:
The displacement pattern is determined in advance through measurement and stored in the memory unit before rotation begins. This preliminary preparation allows the system to execute precise antenna positioning without time delays during actual data transmission.
3Reliability
If the rotating portion is deformed due to deterioration over time, then the relative relationship between the transmitting antenna and the receiving antenna changes, but the capacitive coupling stability is maintained through active compensation
Solution Approach 1:
The rotational position detection unit continuously monitors the rotational position of the rotating portion, and the measurement unit measures the actual relative relationship between antennas. This feedback loop detects deformations caused by deterioration and triggers compensatory displacement of the receiving antenna to maintain stable capacitive coupling.
Solution Approach 2:
The system transitions from a static antenna configuration to a dynamic one where the receiving antenna position is continuously adjusted based on rotational position and measured relative relationship. This dynamic compensation accommodates structural changes in the rotating portion over time while maintaining coupling stability.
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
The solution enhances the stability of data transmission by maintaining a consistent relative relationship between the antennas, ensuring reliable and efficient data transfer despite rotational deformation, thus improving the performance of capacitive coupling methods.
Implementation Method 1
a non-contact data transmission device is used (see, for example, JP2013-244148A). As non-contact transmission methods, a capacitive coupling method using capacitive coupling and an optical transmission method using light are known.
Data Source
AI summary
A CT apparatus includes: an X-ray source; a detector; a rotating portion; a stationary portion; a transmitting antenna provided on the rotating portion for transmitting detection data; a receiving antenna disposed at a position facing a part of the transmitting antenna; a rotational position detector configured to detect a rotational position of the rotating portion and output a detection value; a measurement sensor configured to measure a relative relationship between the transmitting antenna and the receiving antenna and output a measurement value; a displacement mechanism configured to displace at least one of the receiving antenna or the transmitting antenna; and a processor configured to create control data based on the detection value and the measurement value, and execute displacement control to suppress a change in the relative relationship by controlling the displacement mechanism based on the control data during transmission and reception of the detection data.