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Technical Note: Characterization of clinical linear accelerator triggering latency for motion management system

Andrew J Shepard1, Charles K Matrosic1, Jeffrey L Radtke1

  • 1Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA.

Medical Physics
|September 17, 2018
PubMed
Summary

This study quantifies linear accelerator (linac) triggering latency, revealing it

Keywords:
beam-offbeam-onlinac latencymotion managementtime delay

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Image-Guided Radiation Therapy

Background:

  • Motion management systems in radiation therapy require precise timing for data acquisition, processing, and linac triggering.
  • Existing latency guidelines often treat clinical linear accelerator (linac) triggering time as a fixed parameter.
  • Decoupling linac-specific latency is crucial for accurately assessing and optimizing overall system performance.

Purpose of the Study:

  • To develop a method for separating linac-only triggering latency from total system latency.
  • To analyze the impact of accelerator settings on linac triggering latency.
  • To enable latency considerations focused on linac-independent system components.

Main Methods:

  • Measured linac-only triggering latency by comparing beam-on/off signal times with observed linac response.
  • Utilized a multichannel oscilloscope, custom gating box, and in-isocenter diode for precise timing analysis.
  • Investigated latency dependencies across various energies (6/18 MV) and repetition rates (100-600 MU/min).

Main Results:

  • Linac triggering latency is dependent on accelerator repetition rate and energy settings.
  • Beam-on latency decreased with higher repetition rates and lower energies; beam-off latency showed inverse trends.
  • Observed latencies ranged from 3.37/1.45 ms (6 MV) to 6.02/0.73 ms (18 MV) at 600 MU/min; negative latencies were noted.

Conclusions:

  • Linac triggering latency contributes minimally to the total allowable latency in motion management systems.
  • The majority of system latency is attributable to linac-independent factors.
  • This decoupling allows for more focused optimization of linac-independent system components.