Hepatocellular Carcinoma Treated With Iodine-125 Implantation

For RFA, we used a commercially available system (RF 2000; Radio Therapeutics, Mountain View, Calif) and a needle electrode with a 15-gauge insulated cannula that had 10 hook-shaped expandable electrode tines with a diameter of 3.5 cm at expansion (LeVeen; Radio Therapeutics).The radioactivity per seed ranged from 0.5 to 0.6 millicuries (mCi)

The 125I seeds (0.8 mm in diameter and 4.5mm in length) were enclosed in a NiTinol capsule (China Institute of Atomic Energy, Beijing). These seeds could produce 27.4-31.5 keV X-ray and 35.5 Kev γ ray, with a half-life of 59.6 days. The radioactivity per seed ranged from 0.5 to 0.6 millicuries (mCi).