Figure 6

Impact of different maximum leaf speeds and dose rates on the dose volume histograms. Dose volume histogram (relation of absolute volume to delivered dose) for the chiasm and brain stem for different dose rates (triangle – 100 MU/min, square – 200 MU/min, sun – 300 MU/min, circle – 400 MU/min, rhombus – 500 MU/min, heart – 600 MU/min) and leaf velocities (circle – 1.0 cm/sec, sun – 1.5 cm/sec, "B" – 2.0 cm/sec, "A" – 2.5 cm/sec, square – 3.0 cm/sec, rhombus – 3.5 cm/sec, heart – 4.0 cm/sec, triangle – 10.0 cm/min) for one patient with squamous cell cancer of the scalp. Top left – dose rate of 600 MU/min and different leaf velocities. Top right – dose rate of 100 MU/min and different leaf velocities. Bottom left – leaf velocity of 1.0 cm/sec and different dose rates. Bottom right – leaf velocity of 10.0 cm/sec and different dose rates.