RF Power Amplifier Voltage Compensation for MRI Linearity
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Solution Overview
Problem
Magnetic resonance imaging (MRI) systems face image quality issues due to non-linearity in the radio-frequency chain, leading to image distortion, which is not adequately addressed by existing power control solutions.
Innovation Solution
A power control apparatus for radio-frequency power amplifiers, comprising a power control module, voltage detection module, and voltage adjustment module, which adjusts the output power based on detected operating voltage to maintain linear operation and compensate for gain changes, using voltage conversion units and adjustable reference voltages to generate control voltages for precise power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output power of the radio-frequency power amplifier is increased, then the imaging speed and signal strength are improved, but the linearity deteriorates causing image distortion
Solution Approach 1:
The patent implements a feedback mechanism where the actual operating voltage is detected and fed back to the voltage adjustment module. This feedback loop enables real-time compensation for voltage drops, maintaining the control voltage within the linear operating range even when output power is increased, thus preventing image distortion while allowing higher power operation
Solution Approach 2:
The patent dynamically adjusts the control voltage parameter based on the detected operating voltage. By changing the control voltage in response to voltage drops, the system maintains the power amplifier's operation within its linear region, allowing higher output power without sacrificing linearity
2Stability of the object's composition
If the control voltage is increased to maintain output power during voltage drops, then the power stability is improved, but the system complexity increases
Solution Approach 1:
The voltage adjustment module automatically detects voltage drops and adjusts the control voltage without external intervention. This self-service mechanism maintains power stability through real-time compensation, eliminating the need for complex external control systems or manual adjustments
Solution Approach 2:
The voltage adjustment module acts as an intermediary between the power amplifier and the control system. It simplifies the overall system by absorbing the complexity of voltage compensation internally, presenting a stable interface to the rest of the system while handling the complex voltage adjustment operations internally
3Device complexity
If traditional power control methods are used without voltage compensation, then the device complexity is reduced, but the image quality deteriorates due to non-linearity
Solution Approach 1:
The patent segments the power control function into distinct modules: voltage detection module, voltage adjustment module, and power control module. This segmentation allows each module to perform its specific function efficiently, maintaining image quality through specialized voltage compensation while keeping the overall device complexity manageable through modular design
Data Source
AI summary
Provided in the present invention are a power control apparatus for a radio-frequency power amplifier and a radio-frequency transmission system for a magnetic resonance imaging system. The power control apparatus comprises: a power control module used to receive a control voltage so as to control an output power of the radio-frequency power amplifier; a voltage detection module used to detect an operating voltage provided to the radio-frequency power amplifier and to output a detected voltage; and a voltage adjustment module used to adjust, on the basis of the detected voltage, the control voltage received by the power control module so as to adjust the output power of the radio-frequency power amplifier.