Gradient Coil Actuation Scaling for ADC Resolution
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Solution Overview
Problem
Magnetic resonance devices face challenges in achieving a high dynamic range for actuating gradient coils, leading to reduced effective resolution and increased quantization noise, especially when the value range of the target value is a subset of the input range of the gradient coil.
Innovation Solution
The method involves providing a target value for the manipulated variable, scaling the actual value captured using a scaling characteristic dependent on the target value, and transforming it into a digital actual value, thereby adapting the value range to the ADC's input range, ensuring higher effective resolution and reducing quantization noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gradient coil is actuated with a wide input range to cover all possible target values, then the dynamic range is improved, but the effective resolution of the ADC decreases and quantization noise increases
Solution Approach 1:
The patent implements dynamic range adaptation by adjusting the scaling factor based on the actual target value range detected during operation. The system transitions from a static scaling approach to a dynamic one where the scaling characteristic is adapted in real-time to match the actual usage range, thereby optimizing both dynamic range coverage and measurement precision simultaneously
Solution Approach 2:
The system changes the scaling parameter (scaling factor) based on the detected target value range. By monitoring the actual range of target values and adjusting the scaling factor accordingly, the system optimizes the utilization of the ADC's input range, ensuring that the full resolution capability is utilized while maintaining the ability to handle the required dynamic range
2Measurement precision
If a high-resolution ADC is used to maintain effective resolution, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the scaling parameter dynamically to match the actual target value range, allowing the use of lower-resolution ADCs while maintaining effective measurement precision. By optimizing the scaling factor, the system ensures that the ADC operates in its most precise range for the actual usage conditions, reducing the requirement for high-resolution ADCs
Data Source
AI summary
A method for actuating a gradient coil can include the provision of a target value for a manipulated variable, the output of the manipulated variable according to the target value to the gradient coil, the capture of an actual value of the output manipulated variable, the scaling of the captured actual value taking into consideration a scaling characteristic depending on the target value, and the transformation of the actual value captured in a scaled manner into a digital actual value.