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Applied potential tomography for non-invasive temperature mapping in hyperthermia.

H Griffiths, A Ahmed

    Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Fur Medizinische Physik and the European Federation of Organisations for Medical Physics
    |January 1, 1987
    PubMed
    Summary

    Applied Potential Tomography (APT) offers a non-invasive method for monitoring temperature during hyperthermia cancer treatment. This technique uses electrical conductivity changes to image temperature variations, proving effective in both phantom and in vivo experiments.

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    Area of Science:

    • Medical Physics
    • Biomedical Engineering
    • Oncology

    Background:

    • Non-invasive temperature monitoring is crucial for effective hyperthermia cancer treatment, avoiding patient trauma from implanted probes.
    • Applied Potential Tomography (APT) is a promising tomographic method due to its inexpensive, transportable instrumentation suitable for clinical hyperthermia environments.
    • APT leverages the significant temperature coefficient of electrical conductivity (2% °C⁻¹) for sensitive temperature detection, outperforming other methods like CT (0.04% °C⁻¹).

    Purpose of the Study:

    • To investigate the feasibility of Applied Potential Tomography (APT) for non-invasive temperature monitoring in hyperthermia cancer treatment.
    • To develop and evaluate an experimental system for imaging temperature changes using APT.
    • To assess the performance of APT in both phantom (agar) and in vivo (human thigh) models.

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    Main Methods:

    • An experimental system with 16 electrodes was constructed around a cylindrical agar phantom simulating a human thigh.
    • The system was operated at 5 mA and 50 kHz, with heating applied using a 13.56 MHz capacitive system.
    • Temperature changes were imaged by comparing data sets recorded during heating to a pre-heating baseline; the experiment was repeated in vivo.

    Main Results:

    • Images depicting temperature changes over time within the agar phantom were successfully computed.
    • The experimental setup demonstrated the capability to visualize thermal distribution during simulated hyperthermia.
    • The methodology was successfully translated to an in vivo experiment on a volunteer's thigh.

    Conclusions:

    • Applied Potential Tomography (APT) is a viable non-invasive technique for monitoring temperature distributions during hyperthermia treatment.
    • The study validates APT's potential for clinical application in cancer hyperthermia, offering advantages in cost and portability.
    • Further research and development of APT systems are warranted for widespread clinical adoption in oncological hyperthermia.