| Autor: |
Jin JY; Henry Ford Hospital, Detroit, Michigan 48202, USA. jjin1@hfhs.org, Yin FF |
| Jazyk: |
angličtina |
| Zdroj: |
Medical physics [Med Phys] 2005 May; Vol. 32 (5), pp. 1293-6. |
| DOI: |
10.1118/1.1896452 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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