Radiation dose reduction to the critical organ with bismuth shielding during endovascular coil embolisation for...

This study evaluated certified dose reduction with bismuth shielding during an endovascular coiling procedure for cerebral aneurysms using a thermoluminescent dosemeter-100 H. A total of 60 patients were enrolled in the study and randomised into two groups (shielding group and unshielded group). In the unshielded group, the total dose-area product was 286.46 Gy cm(2), the fluoroscopy time was 61.57 min and the procedure time was 96.57 min. In the shielding group, those values were 256.36 Gy cm(2), 51.10 min and 91.00 min, respectively. The reductions in the organ-equivalent doses in the right eye, left eye and thyroid were 32.9 % (11.43 mSv), 28.9 % (17.58 mSv) and 68.1 % (20.48 mSv), respectively. The reductions in the relative organ doses were 21.6, 20.8, and 64.4 %, respectively. Bi shielding was feasible and effective for dose reduction during this neurointerventional procedure.