Radiation Oncology

Table 3 Results of the comparison of the dose obtained from the plan reconstructed from the expected positions with the dose obtained from a plan reconstructed from modified actual positions in which position errors were scaled up to a maximum of 10 and 30 mm

From: Treatment verification using Varian’s dynalog files in the Monte Carlo system PRIMO

Region	Σ=10 mm				Σ=30 mm
	PA [%]	GPR _2,2 [%]	GPR _3,3 [%]		PA [%]	GPR _2,2 [%]	GPR _3,3 [%]
Prostate
PTV ₁	99.6	100	100		98.3	90.7	99.9
PTV ₂	99.5	100	100		98.1	92.2	99.9
PTV ₃	99.6	100	100		98.4	97.7	100
PTV ₄	99.5	100	100		98.2	94.5	99.5
PTV _total	99.5	100	100		98.3	94.9	99.7
Rectum	99.8	100	100		99.2	100	100
Bladder	99.0	100	100		97.2	99.3	99.9
Body	99.5	100	100		98.6	99.8	100
H&N
PTV ₁	99.7	100	100		98.6	93.3	100
PTV ₂	99.7	100	100		98.9	98.2	100
Spinal canal	99.6	100	100		99.0	100	100
Parotid left	99.8	100	100		99.5	100	100
Parotid right	99.3	100	100		98.1	100	100
Body	99.7	100	100		99.2	99.9	100

A good agreement of both dose distributions is obtained for Σ=10 mm. The effect on the dose of induced errors is noticeable for Σ=30 mm

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ISSN: 1748-717X

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