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RF heating-enhanced photoacoustic tomography.

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    Optics Letters
    |February 27, 2026
    PubMed
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    Researchers developed RF Heating-Enhanced Photoacoustic Tomography (HEPAT), integrating radiofrequency (RF) heating with photoacoustic tomography (PAT). This novel imaging technique allows for noninvasive visualization of both optical and RF absorption in tissues.

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    Area of Science:

    • Biomedical Imaging
    • Photoacoustic Tomography
    • Thermoacoustic Tomography

    Background:

    • Photoacoustic tomography (PAT) and thermoacoustic tomography (TAT) use acoustic signals from electromagnetic absorption for noninvasive deep tissue imaging.
    • PAT detects optical absorption, while TAT targets radiofrequency (RF) absorption, offering complementary tissue information.
    • Integrating PAT and TAT is challenging due to the cost and complexity of RF sources.

    Purpose of the Study:

    • To demonstrate the integration of PAT with a low-cost RF heater for simultaneous optical and RF absorption imaging.
    • To introduce RF Heating-Enhanced Photoacoustic Tomography (HEPAT) as a novel imaging modality.
    • To explore HEPAT's potential for enhanced contrast and diagnostic power.

    Main Methods:

    • Developed a system combining PAT with a low-cost RF heater.
    • Utilized RF heating to induce temperature-dependent changes in thermomechanical properties.
    • Mapped RF absorption by detecting acoustic signals generated from these changes.
    • Imaged both optical and RF absorption in tissue phantoms.

    Main Results:

    • Successfully integrated a low-cost RF heater with PAT.
    • Demonstrated the capability of HEPAT to image both optical and RF absorption.
    • Showcased that HEPAT provides distinct, complementary contrast compared to standard PAT.
    • Validated the use of inexpensive RF subsystems for imaging RF absorption.

    Conclusions:

    • HEPAT offers a cost-effective approach to combine optical and RF absorption imaging.
    • The novel modality expands specificity and diagnostic power in biomedical imaging.
    • HEPAT opens new research avenues for studying temperature-related tissue phenomena.