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Figure 1 | Radiation Oncology

Figure 1

From: Optimal set of grid size and angular increment for practical dose calculation using the dynamic conformal arc technique: a systematic evaluation of the dosimetric effects in lung stereotactic body radiation therapy

Figure 1

A phantom computed tomography (CT) image and delineated planning target volume (PTV) and organs at risk (OARs). The clinical target volume (CTV) overridden with 75 Hounsfield Unit value, the PTV created by adding a 5 mm-margin to the CTV, and the OARs (including the lung, the heart, and the spinal cord) were contoured on the phantom CT image sets. A set of 8 simulated spinal cord volumes were placed in different distances with 4 located 9 cm from the isocenter, and the other 4 at 11 cm from it. When a line connecting the isocenter and the original spinal cord in the phantom was chosen as the 0° azimuthal angle, and the other simulated spinal cords were positioned at 0°, 5°, 10°, and 20° in the clockwise direction. Each volume is denoted as Vds,Θ, where ds is the distance from the isocenter to each spinal cord, and Θ is the azimuthal angle.

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Radiation Oncology

ISSN: 1748-717X

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