The diode detector array ArcCHECK was used for measurement of the real dose distribution of IMRT and VMAT. After acquiring a CT image of the ArcCHECK, virtual treatment plans were prepared for head-neck, lung and prostate cases based on the CT images. In each cancer cases, the IMRT and RapidArc (Varian, Palo Alto, CA, USA) plans were made using photons of 6 MV and 10 MV, respectively, and 12 plans were prepared. The virtual tumor target and OARs were contoured as shown in Fig 1 . All of the plans were created using an Eclipse (Varian, Palo Alto, CA, USA) planning system and prepared according to the dose prescription, as shown in Table 1 . A clinical linear accelerator (LINAC), Trilogy Tx (Varian, Palo Alto, CA, USA), was used in this study.
Trilogy tx
Manufactured by Agilent Technologies
Sourced in United States
The Trilogy Tx is a laboratory instrument designed for spectroscopic analysis. It combines multiple analytical techniques, including atomic absorption, graphite furnace, and flame atomic absorption, to provide a comprehensive analytical solution for a wide range of sample types and applications.
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Lab products found in correlation
2 protocols using trilogy tx
1
Dosimetric Evaluation of IMRT and VMAT
2
Optimized kV-CBCT Imaging Protocol
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We acquired data from the OBI system of Trilogy Tx (Varian Medical Systems). The OBI system has two robotic arms to carry a kilo-voltage X-ray source and a flat panel detector positioned orthogonally to the mega-voltage X-ray source for treatment.
The scanning parameters used in this experiment are summarized inTable 1 . It is important to note that we blocked 0.5 cm using a lead blade on the opposite side of copper filter to remove off-axis marginal data from the projections, as discussed in Section I. The dimensions of the intensity-weighting (IW) copper filter are 10 cm × 5.5 cm × 0.6 cm, and it was utilized instead of a half-fan bowtie filter. We selected 6 mm as an appropriate thickness of a copper filter that can achieve substantially reduced radiation exposure (approximately 90%) based on previous work by Cho et al. [11 (link)]. A dose reduction assessment is described in Section II-3.
The scanning parameters used in this experiment are summarized in
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