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Related Experiment Videos

Quantitative bremsstrahlung SPECT imaging: attenuation-corrected activity determination

J A Siegel1

  • 1Department of Radiation Oncology, Cooper Hospital/University Medical Center, Camden, New Jersey 08103.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|July 1, 1994
PubMed
Summary
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Quantitative bremsstrahlung SPECT imaging using 32P-chromic phosphate is feasible in clinical settings. This method accurately quantifies tumor activity, aiding cancer treatment.

Area of Science:

  • Nuclear medicine
  • Radiopharmaceutical imaging

Background:

  • Bremsstrahlung Single-Photon Emission Computed Tomography (SPECT) allows for activity quantitation.
  • 32P-chromic phosphate is a radiopharmaceutical used in SPECT imaging.

Purpose of the Study:

  • To evaluate the accuracy of quantitative bremsstrahlung SPECT imaging with 32P-chromic phosphate.
  • To assess the effectiveness of a commercially available postprocessing attenuation correction algorithm in a clinical setting.

Main Methods:

  • Attenuation correction was applied using a first-order postprocessing algorithm and an experimentally determined effective linear attenuation coefficient for 32P.
  • Phantom studies validated absolute activity analysis and determined optimal parameters for region of interest (ROI) activity determination.
  • Four cancer patients received direct interstitial injection of colloidal 32P-chromic phosphate, followed by SPECT imaging and activity calculation.

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Main Results:

  • The effective linear attenuation coefficient for 32P was determined to be 0.13 cm-1.
  • A fixed 39% threshold provided the best correlation between known and measured activity levels in phantom studies.
  • Calculated 32P activities in patients were within 16.9% of actual activities.

Conclusions:

  • Accurate quantitative bremsstrahlung SPECT imaging is achievable in a clinical setting.
  • Commercially available postprocessing attenuation correction algorithms are effective for 32P imaging.