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Technical Note: High temporal resolution characterization of gating response time.

Rodney D Wiersma1, Bradley P McCabe1, Andrew H Belcher1

  • 1Department of Radiation and Cellular Oncology, University of Chicago, 5841 S. Maryland Avenue, Chicago, Illinois 60637.

Medical Physics
|June 10, 2016
PubMed
Summary
This summary is machine-generated.

Accurate respiratory gating requires precise timing between signals and linear accelerator (LINAC) beam activation. This study developed a high-resolution method to measure gating lag times, revealing significant variations among commercial systems for improved patient safety.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Image-Guided Therapy

Background:

  • Respiratory gating is crucial for patient safety in LINAC treatments.
  • Precise temporal synchronization between gating signals and beam delivery is essential.
  • Existing methods for measuring gating lag times lack sufficient temporal resolution.

Purpose of the Study:

  • To develop and validate a novel method for high-temporal-resolution measurement of gating lag times.
  • To assess the temporal latency of commercial respiratory gating systems.
  • To identify variations in gating performance critical for patient safety.

Main Methods:

  • A respiratory gating simulator with a linear potentiometer and photon diode was used.
  • Simultaneous recording of position and beam output signals at 2500 Hz.
  • Analysis of four commercial respiratory gating systems (phase and position-based).

Main Results:

  • Measured mean gate ON/OFF lag times varied significantly between systems.
  • Phase-based gating systems (RPM) showed lag times of 98/90 ms (single camera) and 86/44 ms (stereoscopic).
  • Position-based gating systems (AlignRT, Calypso) showed lag times of 356/529 ms and 209/60 ms, respectively.

Conclusions:

  • The developed method offers high temporal resolution for characterizing gating lag.
  • Significant variations in lag times exist across different commercial gating systems.
  • Individual gating cycle lag times can vary considerably, impacting treatment precision.