Dosimetric Impact of Titanium Alloy Implant in Spinal IMRT Plan / 中国医疗器械杂志

The purpose of this study is to establish and apply a correction method for titanium alloy implant in spinal IMRT plan, a corrected CT-density table was revised from normal CT-density table to include the density of titanium alloy implant. Dose distribution after and before correction were calculated and compared to evaluate the dose deviation. Plans were also copied to a spinal cancer simulation phantom. A titanium alloy fixation system for spine was implanted in this phantom. Plans were recalculated and compared with the measurement result. The result of this study shows that the max dose of spinal cord showed significant difference after correction, and the deviation between calculation results and measurement results was reduced after correction. The method for expanding the range CT-density table, which means that the density of titanium alloy was included, can reduce the error in calculation.

Hemostasis effect comparison between artificial pressing and Perclose vascular closure device on femoral artery / 心血管康复医学杂志

Objective:To observe hemostoisis efficacy and safety of Perclose vascular closure device on femoral artery in transfemoral pathway radiofrequency ablation (RFA) of supraventricular tachycardia (SVT) .Methods :A total of 199 patients undergoing transfemoral RFA of SVT were divided into Perclose vascular closure group (Perclose group ,n=98) and artificial pressing group (n=101) .Immediate success rate ,hemostasis time ,braking time and in-cidence rates of postoperative complications were observed between two groups .Results:There was no significant difference in immediate success rate of hemostasis (98% vs .100% ) between Perclose group and artificial pressing group , P> 0.05. Compared with artificial pressing group , there were significant reductions in hemostasis time [ (18.9 ± 9.1) min vs .(2.7 ± 0.7) min] ,braking time [ (21.6 ± 3.4) min vs .(6.3 ± 2.4) min] and total inci-dence rate of complications (16.8% vs .4.1% ) in Perclose group , P 0.05 all) . Conclusion:Perclose vascular closure device could shorten the duration of hemostasis and braking ,and reduce the complications .It could be the preferred choice for femoral artery hemostasis .