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Comparative methods for quantifying thyroid volume using planar imaging and SPECT

H Zaidi1

  • 1Department of Radiation Physics, Malmö General Hospital, Sweden.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|August 1, 1996
PubMed
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Single Photon Emission Computed Tomography (SPECT) significantly improves thyroid volume accuracy compared to planar imaging. This 3D method reduces errors, enabling precise radiation dosimetry without organ size assumptions.

Area of Science:

  • Nuclear Medicine
  • Medical Imaging
  • Endocrinology

Background:

  • Accurate thyroid volume determination is crucial for clinical assessments and radiation dosimetry.
  • Conventional planar scintigraphy relies on 2D projections with geometric assumptions, potentially leading to inaccuracies.
  • Existing methods for thyroid volume calculation from planar imaging vary in accuracy.

Purpose of the Study:

  • To compare the accuracy of Single Photon Emission Computed Tomography (SPECT) with conventional planar scintigraphy for determining thyroid phantom volumes.
  • To evaluate an adaptive threshold gray level histogram method for SPECT-based volume calculation.
  • To assess the impact of attenuation and scatter corrections on SPECT accuracy.

Main Methods:

  • Phantoms with known volumes were used to assess accuracy.

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  • Three planar imaging methods were evaluated: a standard hospital method, a modified standard method, and a method with defined regions of interest.
  • SPECT imaging with an adaptive threshold gray level histogram method, including attenuation and scatter corrections, was employed.

    • Main Results:

    • SPECT with corrections achieved a high correlation (r=0.99) and minimal error (approx. 7%) for thyroid volumes (16-75 ml).
    • The standard planar scintigraphy method showed a lower correlation (r=0.97) and larger errors (24.8%).
    • SPECT-derived volumes were significantly more accurate than those from planar imaging.

    Conclusions:

    • SPECT, particularly with attenuation and scatter corrections, provides superior accuracy for thyroid volume determination compared to conventional scintigraphy.
    • This improved accuracy facilitates reliable radiation dosimetry in humans.
    • SPECT eliminates the need for assumptions regarding organ size or tracer concentration.