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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Clinical Imaging of Microwave Mammography
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Published on: November 14, 2025

Image distortion in thermoacoustic tomography caused by microwave diffraction.

Changhui Li1, Manojit Pramanik, Geng Ku

  • 1Biomedical Engineering Department, Washington University in St. Louis, St. Louis, Missouri 63130, USA. CLI@biomed.wustl.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 4, 2008
PubMed
Summary

An intrinsic image distortion in microwave-induced thermoacoustic tomography arises from microwave diffraction. This phenomenon causes uneven acoustic pressure, impacting image quality, but a partial correction method is presented.

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A Stable Phantom Material for Optical and Acoustic Imaging
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Area of Science:

  • Medical Imaging
  • Biophysics
  • Acoustic Physics

Background:

  • Microwave-induced thermoacoustic tomography (MITAT) is an emerging imaging modality.
  • Accurate image reconstruction in MITAT relies on uniform microwave energy deposition.
  • Intrinsic distortions can limit the diagnostic potential of MITAT.

Purpose of the Study:

  • To identify and characterize an intrinsic image distortion in microwave-induced thermoacoustic tomography.
  • To investigate the underlying physical mechanism causing the distortion.
  • To propose a method for mitigating the observed distortion.

Main Methods:

  • Numerical simulations were performed to model microwave propagation and acoustic wave generation within heterogeneous objects.
  • Phantom experiments using tissue-mimicking materials were conducted to validate simulation results.
  • Analysis focused on the spatial distribution of acoustic pressure and its correlation with microwave field patterns.

Main Results:

  • A significant image distortion was observed in MITAT reconstructions.
  • The distortion was attributed to microwave diffraction effects within the imaged object, leading to nonuniform acoustic pressure excitation.
  • Both simulations and phantom experiments confirmed the presence and origin of this distortion.

Conclusions:

  • Microwave diffraction is an inherent source of image distortion in MITAT.
  • This distortion can lead to artifacts and inaccuracies in thermoacoustic images.
  • A partial correction strategy can be employed to improve image fidelity in MITAT.