An NTCP Analysis of Urethral Complications from Low Doserate Mono- and Bi-Radionuclide Brachytherapy

Table 4

Dose received by the hottest 20% of the urethra volume (DU₂₀), 125I LDR equivalent DU₂₀ (DU_20-I), and urethra Normal Tissue Complication Probability (NTCP) for the different seed implants. The values are averaged over the three patients. Radiobiological parameters from Zaider et al. are used.

	DU20 (Gy)	DU20-I (Gy)	NTCP (%)
^125I	202.3	202.3	22.0
Pd-I	201.8	207.4	22.6
^103Pd	176.3	195.8	21.3
Pd-Cs (a)	185.5	194.9	21.2
Pd-Cs (b)	169.0	177.3	19.3
^131Cs	168.4	171.7	18.7