High Frequency Coil Device Overlapping Preamplifier
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Solution Overview
Problem
In magnetic resonance diagnostic apparatuses, the mutual induction between loop coils and preamplifier circuits leads to signal attenuation, deteriorating signal-to-noise characteristics due to the need to place preamplifiers at a distance from the coils to reduce this induction.
Innovation Solution
A high frequency coil device with overlapping loop coils and integrated preamplifiers, where the electric circuit units, including preamplifiers, are positioned to overlap with the loop coils, reducing mutual induction and transmission loss by shortening signal lines and minimizing sensitivity degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the preamplifier circuit is disposed at a substantial distance from the loop coils to reduce mutual induction, then the influence on the electric circuit unit is reduced, but the transmission line becomes lengthened causing significant signal attenuation and deteriorated signal-to-noise characteristics
Solution Approach 1:
The patent applies dimensionality change by arranging loop coils and preamplifiers in a three-dimensional overlapping configuration rather than traditional planar separation. Multiple loop coils are positioned at different heights and orientations, allowing the preamplifier to be physically adjacent to the coils while the overlapping geometry minimizes mutual induction effects. This spatial arrangement in multiple dimensions enables short transmission lines without excessive mutual induction interference.
2Loss of energy
If the loop coils are placed adjacent to the preamplifier to shorten transmission lines, then transmission loss is reduced, but mutual induction occurs affecting the electric circuit unit
Solution Approach 1:
The patent segments the coil array into multiple independent loop coils arranged in a three-dimensional configuration. Each loop coil is positioned at a different location and orientation, creating spatial separation that reduces mutual induction between adjacent coils. The preamplifier is connected to multiple segmented coils through short transmission lines, achieving low transmission loss while the segmentation geometry minimizes harmful mutual induction effects.
3Measurement precision
If multiple loop coils are disposed to receive weak magnetic resonance signals with good sensitivity, then signal reception capability is improved, but mutual induction occurs between the loop coils affecting the preamplifier circuit
Solution Approach 1:
The patent arranges multiple loop coils in a three-dimensional space with different positions, orientations, and overlapping configurations. This multi-dimensional arrangement allows the coils to maintain high sensitivity for receiving weak magnetic resonance signals while the spatial separation and overlapping geometry in three dimensions reduce mutual induction between adjacent coils compared to traditional planar arrangements.
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 configuration enhances the quality of magnetic resonance signal reception by reducing signal attenuation and improving signal-to-noise characteristics while maintaining sensitivity, allowing for more effective signal processing and synthesis.
Implementation Method 1
including a preamplifier to amplify each of the magnetic resonance signals received by each of the plurality of loop coils
Implementation Method 2
a mutual induction occurs between the loop coils. This mutual induction affects an electric circuit unit, such as a preamplifier circuit
Data Source
AI summary
A magnetic resonance diagnostic apparatus, for receiving a magnetic resonance signal occurred in a subject, includes a plurality of high frequency loop coils arranged so that a part of their inner loop surface overlaps each other in a predetermined direction, and a first electric circuit arranged to overlap the inner loop surface of the plurality of high frequency loop coils in the predetermined direction, at a location where the inner loop surface of the plurality of high frequency loop coils overlaps each other, and including a preamplifier to amplify each of the magnetic resonance signals received by each of the plurality of loop coils.