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Brain Imaging01:14

Brain Imaging

227
Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic...
227

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Temperature-Switch-Controlled Second Harmonic Mode Sensor for Brain-Tissue Detection.

Xiang Li1, Cheng Yang1, Chuming Guo1

  • 1College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China.

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Summary

This study introduces a novel metastructure for non-contact brain tissue measurement using second harmonic generation (SHG). The sensor can differentiate brain tissues and includes a temperature-switch function for reliable operation.

Keywords:
as a frequency-doubling phenomenonconversion efficiencylayered second harmonic generation (SHG)plays a crucial role in metastructuresecond harmonic generationtemperature switchtransfer matrix method

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Area of Science:

  • Biomedical Engineering
  • Optics
  • Materials Science

Background:

  • Non-contact brain tissue measurement is crucial for biomedical research.
  • Metamaterials offer unique optical properties for sensing applications.
  • Second Harmonic Generation (SHG) provides a sensitive optical signal.

Purpose of the Study:

  • To propose a layered metastructure for brain tissue identification.
  • To utilize SHG conversion efficiency (CE) for distinguishing tissue types.
  • To develop a temperature-switch function for sensor reliability.

Main Methods:

  • Derivation of SHG in a multilayer metastructure using the transfer matrix method.
  • Characterization of refractive index ranges and sensitivities.
  • Analysis of SHG CE response to temperature variations.

Main Results:

  • Distinguished refractive index ranges: 1.23–1.31 RIU and 1.38–1.44 RIU.
  • Achieved sensitivities of 0.8597 RIU-1 and 1.2967 RIU-1.
  • Successfully differentiated gray matter, white matter, and low-grade glioma.
  • Demonstrated a temperature-switch function based on SHG CE (291.4–307.9 K).

Conclusions:

  • The proposed metastructure functions as a second harmonic mode sensor (SHMS) for brain tissue identification.
  • The temperature-switch mechanism enhances the reliability of the SHMS.
  • This work presents a novel approach for temperature-controlled second harmonic detection in biomedical applications.