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Continuing Education

Energy-Weighted Acquisition: Evaluation of Physical Characteristics and Clinical Utility

Todd Donaghy, Erin McKay, Richard Smart, Richard Quinn and S. Patrick Butler
Journal of Nuclear Medicine Technology June 1995, 23 (2) 49-55;
Todd Donaghy
Department of Nuclear Medicine, St. George Hospital, Kogarah, Sydney, Australia
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Erin McKay
Department of Nuclear Medicine, St. George Hospital, Kogarah, Sydney, Australia
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Richard Smart
Department of Nuclear Medicine, St. George Hospital, Kogarah, Sydney, Australia
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Richard Quinn
Department of Nuclear Medicine, St. George Hospital, Kogarah, Sydney, Australia
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S. Patrick Butler
Department of Nuclear Medicine, St. George Hospital, Kogarah, Sydney, Australia
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Abstract

Objective: Energy-weighted acquisition (EWA) is a commercially available technique designed to reduce the contribution of Compton scattered radiation in the final image. This study investigates the utility of EWA, using 99mTc and 67Ga, in both phantoms and clinical studies.

Methods: Phantom studies were performed to evaluate planar and SPECT image contrast, spatial resolution, count rate performance and attenuation correction. Clinical bone images and gallium images were acquired with and without EWA and were evaluated for anatomical and lesion definition.

Results: For 99mTc, EWA was found to provide improved image contrast for both planar and SPECT images, with no deterioration in count rate performance and a small improvement in spatial resolution when compared to conventional on-peak and off-peak imaging. For 67Ga, EWA was superior to conventional imaging using the lower two peaks, which in turn provided better contrast than using all three peaks.

Conclusion: The improvement in contrast in the phantom data was reflected in the clinical images. EWA images demonstrated greater anatomical definition in 60/65 99mTc bone scans and in 20/22 67Ga scans.

  • energy-weighted acquisition
  • attenuation correction
  • spatial resolution
  • bone imaging
  • gallium imaging
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Journal of Nuclear Medicine Technology: 23 (2)
Journal of Nuclear Medicine Technology
Vol. 23, Issue 2
June 1, 1995
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Energy-Weighted Acquisition: Evaluation of Physical Characteristics and Clinical Utility
Todd Donaghy, Erin McKay, Richard Smart, Richard Quinn, S. Patrick Butler
Journal of Nuclear Medicine Technology Jun 1995, 23 (2) 49-55;
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Keywords

  • energy-weighted acquisition
  • attenuation correction
  • spatial resolution
  • bone imaging
  • gallium imaging
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Energy-Weighted Acquisition: Evaluation of Physical Characteristics and Clinical Utility
Todd Donaghy, Erin McKay, Richard Smart, Richard Quinn, S. Patrick Butler
Journal of Nuclear Medicine Technology Jun 1995, 23 (2) 49-55;

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