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Related Experiment Videos

Accuracy in target localization in stereotactic radiosurgery

D R Choi1, Y C Ahn, D Y Kim

  • 1Department of Radiation Oncology, Samsung Medical Center, Kangnam-Ku, Seoul, Korea. drchoi@smc.-samsung.co.kr

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|April 1, 1997
PubMed
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This study assessed the accuracy of imaging and linear accelerator alignment for stereotactic radiosurgery. CT localization achieved a total isocentric deviation of 1.3 mm, crucial for precise radiation delivery.

Area of Science:

  • Medical Physics
  • Radiotherapy Technology

Background:

  • Accurate target localization is critical for effective stereotactic radiosurgery (SRS).
  • Evaluating the precision of imaging modalities and treatment delivery systems is essential for patient safety and treatment efficacy.

Purpose of the Study:

  • To investigate the accuracy of computed tomography (CT), magnetic resonance imaging (MRI), and digital angiography in target localization.
  • To determine the isocentric deviation of a linear accelerator for SRS applications.
  • To assess the overall accuracy of the SRS procedure from imaging to treatment delivery.

Main Methods:

  • A geometrical phantom with known 3D coordinates (0.1 mm error range) was used.
  • CT and MRI images were acquired, transferred to a 3D treatment planning system, and compared to phantom coordinates.

Related Experiment Videos

  • Digital angiography was performed for spatial accuracy measurements.
  • Linear accelerator isocenter accuracy was measured using X-ray films at various gantry angles.
  • The entire SRS procedure was simulated using the phantom, with final target accuracy verified by portal films.

    • Main Results:

    • Diagnostic imaging accuracy was within 2.1 mm, with exceptions for MR-axial images.
    • Linear accelerator isocenter deviation was found to be within 0.7 mm.
    • The total isocentric deviation for the overall procedure, using CT localization, was 1.3 ± 0.5 mm.

    Conclusions:

    • CT localization demonstrates high accuracy suitable for SRS.
    • The evaluated linear accelerator and imaging systems meet the precision requirements for stereotactic radiosurgery.
    • Overall, the integrated SRS workflow exhibits acceptable accuracy for clinical implementation.