Time delay measurement for linac based treatment delivery in synchronized respiratory gating radiotherapy.

Journal Article (Journal Article)

A time delay in a respiratory gating system could cause an unexpected phase mismatch for synchronized gating radiotherapy. This study presents a method of identifying and measuring the time delay in a gating system. Various port films were taken for a motion phantom at different gating window levels with a very narrow window size. The time delay for the gating system was determined by comparing the motion curve (the position of a moving object versus the gating time) measured in the port films to the motion curve determined by the video cameras. The measured time delay for a linac-based gating system was 0.17+/-0.03 s. This time delay could induce target missing if it was not properly taken into account for the synchronized gating radiotherapy. Measurement/verification of the time delay should be considered as an important part of the accepting/commissioning test before the clinical use of the gating system.

Full Text

Duke Authors

Cited Authors

  • Jin, J-Y; Yin, F-F

Published Date

  • May 2005

Published In

Volume / Issue

  • 32 / 5

Start / End Page

  • 1293 - 1296

PubMed ID

  • 15984681

International Standard Serial Number (ISSN)

  • 0094-2405

Digital Object Identifier (DOI)

  • 10.1118/1.1896452


  • eng

Conference Location

  • United States