High dose rate brachytherapy as monotherapy for localised prostate cancer: a hypofractionated two-implant approach in 351 consecutive patients

Table 2 Dosimetry parameters of the brachytherapy protocol with total physical prescription dose (Gy) and normal tissue dose constraints (as percentages of the prescribed reference dose)

Treatment scheme	PTV	D₁₀/D_{0.1 cm}³	D₁₀/D_{0.1 cm}³	D₁₀/D_{0.1 cm}³	D90	V100	V150
Treatment scheme	PTV	Rectum	Bladder	Urethra	D90	V100	V150
9.5 Gy x 4	38.0 Gy	≤ 75% / ≤ 80%	≤ 75% / ≤ 80%	≤ 115% / ≤ 120%	≥ 100%	≥ 90%	≤ 35%

PTV = planning target volume; D10-Rectum = dose delivered to 10% of the rectum; D10-Bladder = dose delivered to 10% of the bladder; D10-Urethra = dose delivered to 10% of the urethra; D _{0.1 cm}³ = minimum dose to the most exposed 0.1 cm³ of the organ; D90 = dose delivered to 90% of the PTV ; V100, V150 = percentage of PTV receiving 100% and 150% of the prescription dose.

ISSN: 1748-717X