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- W2109464562 abstract "Beam characteristics may be influenced when a linear accelerator is operated with gated operation. In this study, we evaluated the dosimetry of a Siemens Artiste linear accelerator under gated operation and investigated if there are dosimetric limitations to use the treatment planning system based on non-gated beam data for delivering respiratory gated treatment. The Siemens Artiste linear accelerator was installed at our institution with ANZAI-733V respiratory gating system (ANZAI MEDICAL CO, LTD.). The system utilizes a pressure sensor to track the respiratory motion. The signal from the sensor triggers the linac to turn radiation beam on or off. In this study, a motion phantom simulated the respiratory signal. Dosimetric measurements were performed using an IMRT MatriXX system (IBA Dosimetry, Inc.) at 10 cm depth with 100 cm source-to-surface distance setup. The MatriXX system is a 2D ion chamber array with 7.6 mm spatial resolution; therefore it can be used to measure both the absolute dose and the 2D dose distribution. 6MV and 15MV photon beam data under gated operation were collected for two radiation fields (10*10 cm2 and 20*20 cm2) and 8 duty cycles (50, 25, 10, 5, 4, 3, 2, and 1 monitor unit (MU) delivered per 4 second gate cycle). Measurements were compared with corresponding non-gated operation. The absolute readings of the central ion chamber for gated deliveries were compared to those from the non-gated delivery. 2D dose distribution comparison was performed with gamma analysis (1% and 1 mm criterion). For the 6MV photon beam, all dose deviations were within 1%, even for an extremely low duty cycle (1MU per gate). Similarly, the 2D dose distributions were similar between the gated and non-gated readings. The gamma values of all points in the radiation fields were <1 with exception of 1 MU delivery per respiratory cycle, which had 95% points with gamma value 5 MU per gate. For the condition of <5 MU per gate, the maximum dose difference between gated and non-gated delivery was 3%. The points with gamma values <1 were 90% for 1 MU per gate. However, all points had gamma less than 1 if 2% and 2mm criterion were used. The radiation field size (10*10 cm2 vs. 20*20 cm2) did not significantly influence dosimetric differences. The dosimetric performance (absolute dose and 2D dose distribution) of the Siemens Artiste linear accelerator was not found to be significantly affected by the gating operation. A treatment planning system based on non-gated beam data can be used for the gated treatment planning. Cautious use of planning with the 15 MV photon beam using a small number of MU (<5) per gate may be considered." @default.
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- W2109464562 date "2010-11-01" @default.
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- W2109464562 title "Comparison of Dosimetry of a New Linear Accelerator under Gated Operation vs. Non-gated Operation" @default.
- W2109464562 doi "https://doi.org/10.1016/j.ijrobp.2010.07.1899" @default.
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