MRI Noise Source Search Using Antenna Detection
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Solution Overview
Problem
Existing noise source specification devices for MRI apparatuses cannot accurately identify the specific site of noise generation, leading to inadequate noise reduction and decreased image quality.
Innovation Solution
A noise source search device and method that utilize a reference antenna and a probe antenna to measure noise intensity and time differences, allowing for the specification of noise generation conditions and sites within the MRI apparatus, particularly by analyzing the axis and drive frequency of the gradient magnetic field coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference antenna and probe antenna are used to measure noise intensity and time differences, then the noise generation site can be accurately specified, but the device complexity increases
Solution Approach 1:
The patent introduces antennas as intermediary measurement devices that detect noise signals without interfering with the MRI imaging process. The reference antenna and probe antenna serve as mediators between the noise source and the measurement system, enabling non-intrusive noise characterization through electromagnetic field detection.
Solution Approach 2:
The patent replaces complex mechanical noise measurement systems with electromagnetic field-based antenna measurement. Instead of using mechanical sensors that would require physical contact and complex mounting, the system uses antennas to detect noise through electromagnetic radiation, simplifying the measurement approach while maintaining accuracy.
2Measurement precision
If multiple antennas are positioned at different locations to measure noise time differences, then the noise source location precision improves, but the measurement time increases
Solution Approach 1:
The patent employs periodic switching between reference antenna measurement mode and probe antenna measurement mode. The system alternates between these measurement states, allowing noise characteristics to be captured through time-multiplexed measurements rather than requiring all antennas to measure simultaneously, thus reducing total measurement time.
Solution Approach 2:
The system performs preliminary noise measurements using the reference antenna at a fixed position before conducting probe antenna measurements at multiple locations. This preliminary characterization establishes baseline noise properties that guide subsequent targeted measurements, reducing the number of required measurement points and overall measurement time.
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
Enables accurate identification and reduction of noise sources, thereby improving the image quality of MRI images by pinpointing the noise generation site.
Implementation Method 1
the electromagnetic wave generated from a radio, a television, a mobile phone, a motor, a switch, and the like becomes a noise
Data Source
AI summary
Provided is a noise source search device to be applied to an MM apparatus that obtains an NMR signal generated from a subject disposed in a static magnetic field by applying an RF pulse of a high frequency coil and a gradient magnetic field pulse of a gradient magnetic field coil to the subject, the device including: a reference antenna and a probe antenna that measure a noise generated in the MRI apparatus; a noise generation condition specification unit that specifies an axis and a drive frequency as a noise generation condition generated in the MRI apparatus, on the basis of a noise intensity of the noise that is measured by the reference antenna; and a noise generation site specification unit that drives the gradient magnetic field coil under the noise generation condition that is specified by the noise generation condition specification unit.