CT-Guided ¹²⁵I Seed Interstitial Brachytherapy as a Salvage Treatment for Recurrent Spinal Metastases after External Beam Radiotherapy

Table 3

¹²⁵I seed interstitial brachytherapy parameters in 24 patients.

Parameter	Median	Range
GTV volume (cc)	41.0	3.8–121.4
Number of seeds	50	10–103
Seed activity (mCi)	0.7	0.5–0.8
Total seed activity (mCi)	33.8	6.0–62.5
(Gy)	99.0	90.3–176.0
GTV: (%)	91.2	83.5–98.1
GTV: (%)	90.3	80.3–97.6
of spinal cord (Gy)	39.2	6.1–110.5
of cauda equina (Gy)	20.5	5.0–70.2

, dose delivered to 90% of the target volume; and , the percentage of the target volume receiving at least 90% and 100% of the prescription dose.