Integrated ESR Chip for Portable Medical Imaging
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Solution Overview
Problem
Current electron spin resonance (ESR) spectrometers are bulky, costly, and prone to noise due to large discrete RF/microwave components, limiting their portability and response time, making them unsuitable for efficient in-vivo measurements.
Innovation Solution
An integrated ESR circuit chip with a monolithic design on a single chip substrate, including an oscillator, power amplifier, receiver amplifier, mixer, and baseband amplifier, which generates and processes ESR signals efficiently, reducing noise and size while enabling both continuous wave and pulse mode operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete RF/microwave components are used in ESR spectrometers, then the system can perform ESR measurements, but the device becomes bulky, heavy, and prone to noise
Solution Approach 1:
The patent combines multiple discrete RF/microwave components (oscillator, power amplifier, receiver amplifier, mixer, baseband amplifier) into a single integrated circuit chip. This integration eliminates the need for separate discrete components, thereby reducing the overall device size, weight, and complexity while maintaining the functional capability to perform ESR measurements with high reliability and low noise.
2Ease of manufacture
If discrete components are used in ESR systems, then the system can be built, but the weight exceeds hundreds of kilograms prohibiting portability
Solution Approach 1:
The patent integrates all RF/microwave processing functions onto a single chip, reducing the system weight from hundreds of kilograms to a portable form factor. The integrated circuit eliminates the need for heavy discrete components while maintaining full ESR measurement capability, enabling portable and mobile applications.
3Adaptability or versatility
If large discrete ESR imagers are used, then the system can perform imaging, but the response time becomes slow limiting time-domain imaging capability
Solution Approach 1:
The integrated circuit reduces the response time by eliminating signal transmission delays between discrete components and reducing the physical size of the system. The compact integrated design enables faster signal processing and measurement acquisition, making the system suitable for time-domain imaging applications where rapid response is critical.
4Reliability
If discrete RF components are used, then the system can operate, but it becomes sensitive to radiative effects and ambient RF noise
Solution Approach 1:
The patent integrates all RF processing functions onto a single chip, which shields the sensitive receiver circuits from external RF interference and ambient noise. The integrated design minimizes the exposure of internal circuits to radiative effects by confining all signal paths within the compact chip structure, thereby improving data quality and measurement reliability.
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 integrated ESR chip system enhances portability, reduces noise, and improves response times, allowing for more sensitive and accurate measurements of spin relaxation times and other ESR parameters, facilitating non-invasive applications like disease diagnosis and imaging.
Implementation Method 1
ESR is a measurement technique that relies on the external manipulation of the direction of this electron magnetization... an oscillating magnetic field B1... is applied along a direction that is perpendicular to the polarizing field B0. Usually the oscillating field B1 is generated using a microwave resonator... and is designed to excite the unpaired electrons by driving transitions between the different angular momentum states of the unpaired electron(s).
Data Source
AI summary
A method includes generating, from an integrated oscillator circuit, an oscillating output signal and generating, by an integrated power amplifier (PA) circuit, an amplified oscillating output signal based on the oscillating output signal. The method further includes receiving, by integrated receiver amplifier circuit, an electron spin resonance (ESR) signal from biological samples that include a magnetic species and generating, by the integrated receiver amplifier circuit, an amplified ESR signal based on the received ESR signal. The method further includes receiving, by the integrated receiver amplifier circuit, an electron spin resonance (ESR) signal from magnetic nanoparticles that are loaded with drugs or attached to human cells.