Time delay measurement for linac based treatment delivery in synchronized respiratory gating radiotherapy.
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.
Duke Scholars
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Related Subject Headings
- Time Factors
- Respiratory Mechanics
- Radiotherapy, Conformal
- Radiotherapy Planning, Computer-Assisted
- Radiation Dosage
- Particle Accelerators
- Nuclear Medicine & Medical Imaging
- Movement
- Humans
- Film Dosimetry
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Time Factors
- Respiratory Mechanics
- Radiotherapy, Conformal
- Radiotherapy Planning, Computer-Assisted
- Radiation Dosage
- Particle Accelerators
- Nuclear Medicine & Medical Imaging
- Movement
- Humans
- Film Dosimetry