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Related Experiment Videos

Isotherm mapping in hyperthermia using subtraction X-ray computed tomography.

S M Bentzen, J Overgaard, J Jørgensen

    Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
    |October 1, 1984
    PubMed
    Summary

    X-ray computed tomography (CT) can map temperature changes using digital subtraction imaging. This method achieved 0.5°C resolution for potential clinical hyperthermia applications.

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    Area of Science:

    • Medical Imaging
    • Biophysics
    • Thermal Therapy

    Background:

    • Accurate temperature monitoring is crucial for effective clinical hyperthermia.
    • Existing methods for temperature mapping may have limitations in spatial resolution or accuracy.

    Purpose of the Study:

    • To investigate the feasibility of using X-ray computed tomography (CT) for precise isotherm mapping.
    • To assess the potential of CT-based temperature mapping in clinical hyperthermia.

    Main Methods:

    • Digital subtraction of X-ray CT images acquired before and during heating of an agar phantom.
    • Noise reduction techniques including low-pass filtering via 2D Fast Fourier Transform and spatial averaging.
    • Analysis of CT number changes to derive temperature isotherms.

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    Main Results:

    • Successfully obtained spatial distribution of CT changes indicative of temperature variations.
    • Achieved a temperature resolution of 0.5°C with a spatial resolution of 4.2 mm.
    • Presented isotherms demonstrating the capability of the developed method.

    Conclusions:

    • X-ray computed tomography is a viable technique for isotherm mapping with sufficient resolution for hyperthermia.
    • The developed method shows promise for non-invasive temperature monitoring in clinical settings.
    • Further research is warranted to optimize the technique for patient use.