The effect of different distances to radiation resources for radiation protection in percutaneous kypho?鄄plasty

English Keywords:Radiation protection, Distance, Radiation resources, Percutaneous kyphoplasty

English Abstract:

  【Abstract】 Objectives: To compare the effects of different distances to radiation resources for radiation protection in percutaneous kyphoplasty, and to find out the appropriate methods for clinical work. Methods: 45 patients admitted for single level osteoporotic vertebral compression fracture were divided into 3 groups randomly(group A, B and C): primary operator standing next to operating table for entire operation in group A; primary operator standing 1.5 meters and 4 meters from operating table during fluoroscopic time in group B and C respectively. All surgeries were performed by the same surgeon. The time of operation, duration and times of fluoroscopy, pre- and post-operative visual analogue scale(VAS) were recorded. Meanwhile, radiation doses in the sites of operator′s eyes, thyroid, chest and right wrist were recorded by 4 unprotected radiometers (PRM-1200) simultaneously. Results: The time of operation in group C was significantly more than that in group A and B(P<0.05) and there was no statistical difference on operation time between group A and B(P>0.05). There was no statistical difference on fluoroscopic time and volumes of cement among 3 groups(P>0.05). Either the pre- or the post-operative VAS showed no statistical difference among 3 groups(P>0.05). The post-operative VAS in 3 groups decreased significantly compared with pre-operative VAS respectively(P<0.05). In group A, the dose of radiation delivering to the eyes, thyroid, chest and right wrist was 0.362±0.087mSv, 0.435±0.064mSv, 0.494±0.106mSv and 1.542±0.179mSv, respectively. In group B, the radiation dose was 0.138±0.055mSv, 0.156±0.031mSv, 0.158±0.075mSv and 0.204±0.121mSv, respectively. In group C, the radiation dose was 0.112±0.039mSv, 0.129±0.052mSv, 0.120±0.083mSv and 0.292±0.046mSv, respectively. The radiation doses in eyes, thyroid, chest and right wrist in group A were significantly more than those in group B and C(P<0.05) and there was no statistical difference on radiation dose between group B and C in all 4 sites(P>0.05). No complication such as nerve injury or pulmonary embolism was found in two groups. Conclusions: Distance to radiation resources is a key element for radiation protection and 1.5 meters away from operating table is the best distance to achieve both good radiation protection and curative effect.