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Clinical Image Coregistration Variability on a Dedicated Radiosurgery Unit.

Mark Ruschin1,2, Arjun Sahgal2,3, Hany Soliman2,3

  • 1Department of Medical Physics, Sunnybrook Odette Cancer Centre, Toronto, Ontario, Canada.

Neurosurgery
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PubMed
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Image coregistration for radiosurgery is highly reproducible, with variations within 0.2 mm. This ensures accurate target localization using magnetic resonance imaging (MRI) and cone-beam computed tomography (CBCT) for frameless treatments.

Keywords:
BrainCone-beam CTGamma knifeImage coregistrationMRIRadiosurgeryStereotactic

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Area of Science:

  • Medical physics
  • Radiosurgery techniques
  • Image-guided therapy

Background:

  • Frameless radiosurgery utilizes cone-beam computed tomography (CBCT) for stereotactic definition.
  • Magnetic resonance imaging (MRI) is crucial for delineating treatment targets.
  • Reproducible coregistration between MRI and CBCT is essential for precise target localization.

Purpose of the Study:

  • To assess the reproducibility of image coregistration for frameless radiosurgery.
  • To evaluate the accuracy of MRI-to-CBCT coregistration in patient imaging.

Main Methods:

  • Three coregistration types (MRI-to-CT, MRI-to-CBCT, CT-to-CBCT) were analyzed in 15 patients.
  • Coregistration was performed 5-30 times per type, totaling 465 coregistrations.
  • Target Registration Error (TRE) and Compound Registration Error (CRE) were measured to quantify accuracy.

Main Results:

  • Median TRE was 0.11 mm (MRI-to-CT), 0.17 mm (MRI-to-CBCT), and 0.12 mm (CT-to-CBCT).
  • MRI-to-CBCT showed a statistically significant higher TRE (P < .01).
  • Median CRE was 0.44 mm, with submillimeter errors within the central 16 cm of the head.

Conclusions:

  • Image coregistration demonstrated high reproducibility, with variations generally within 0.2 mm.
  • Compound Registration Error (CRE) is submillimeter in the central 16 cm region, ensuring accuracy for target localization.
  • The findings support the reliable use of MRI-to-CBCT coregistration in frameless radiosurgery.