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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)

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

Treatment scheme PTV D10/D0.1 cm3 D10/D0.1 cm3 D10/D0.1 cm3 D90 V100 V150
Rectum Bladder Urethra
9.5 Gy x 4 38.0 Gy ≤ 75% / ≤ 80% ≤ 75% / ≤ 80% ≤ 115% / ≤ 120% ≥ 100% ≥ 90% ≤ 35%
  1. 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 cm3 = 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.