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Target localization using scanner-acquired SPECT data.

Justin R Roper1, James E Bowsher, Joshua M Wilson

  • 1Department of Radiation Oncology, Duke University Medical Center, Durham, NC, USA. justin.roper@duke.edu

Journal of Applied Clinical Medical Physics
|May 16, 2012
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Summary
This summary is machine-generated.

Single photon emission computed tomography (SPECT) imaging shows potential for guiding radiation therapy. Proximal detector trajectories and attenuation correction achieved sub-2mm localization accuracy in phantom studies, supporting its clinical use.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Radiation Oncology

Background:

  • Single photon emission computed tomography (SPECT) and planar imaging are explored for radiation therapy guidance.
  • Previous SPECT localization studies relied on simulated data; this study uses scanner-acquired images.

Purpose of the Study:

  • To evaluate SPECT-based target localization accuracy using scanner-acquired images in a phantom.
  • To compare localization performance across different SPECT detector trajectories and assess the impact of attenuation correction.

Main Methods:

  • Five fillable spheres with a 6:1 99mTc activity ratio were imaged using a Trionix Triad scanner.
  • SPECT scans were acquired with 180° (left/right lateral) and 360° detector trajectories (4.5 min each).
  • Images were reconstructed with and without attenuation correction; localization errors were compared to true target locations from 12 hr SPECT/CT.

Main Results:

  • Proximal 180° SPECT trajectories yielded the lowest mean localization errors (0.90 ± 0.25 mm), followed by 360° (1.31 ± 0.51 mm) and distal 180° (3.93 ± 1.48 mm).
  • Attenuation correction improved localization by 0.15 mm for well-localized targets and 1.0 mm for poorly localized targets.
  • Localization accuracy was generally worse with planar imaging compared to proximal 180° and 360° SPECT.

Conclusions:

  • Proximal SPECT detector trajectories combined with attenuation correction offer sub-2mm localization accuracy for superficial targets, supporting its use in biopsy, surgery, and radiation therapy.
  • SPECT imaging demonstrates potential for integration into radiation therapy treatment rooms for precise target localization.
  • Detector trajectory significantly impacts SPECT localization accuracy, with proximal orbits being superior.