750 / 1578
An example
•
Target volume and OAR selection and delineation
Ø
The planning CT was transferred to the treatment planning system
(Accuray, Sunnyvale, CA). The tumor and organs at risk (OAR) were
then contoured. The gross tumor volume (GTV, 1.5 cm3) was
contoured using the lung window. The planning target volume (PTV,
6.7 cm3) was obtained by adding a 5mm margin to the GTV. The
OARs were the lungs, the heart, the esophagus and the spinal cord.
•
Planning aims and DVH constraints
Ø
The total dose was prescribed to
the outer border of the PTV,
and 95% of the volume of the PTV
had to receive the prescription dose.
The dose constraints for the organs
at risk for a peripheral lung tumor
are shown in Table A.1
SBRT 2017 - D. Verellen