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Radiation Dose to Patients Undergoing X-ray Diagnosis, Treatment and Follow-up for Cerebral Aneurysms Shigenobu SEGUCHI 1 , Takaya SAIJOU 1 , Yoshinobu ISHIKAWA 1 , Takao KOJIMA 2 , Shuji KOYAMA 3 1Division of Radiology, Department of Medical Technology, Nagoya Daini Red Cross Hospital 2Department of Neurosurgery, Nagoya Daini Red Cross Hospital 3Graduate School of Medicine, Nagoya University Keyword: cerebral angiography , interventional neuroradiology , CT Angiography , lens dose , effective dose pp.411-418
Published Date 2015/5/10
DOI https://doi.org/10.11477/mf.1436203039
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This study aimed to evaluate radiation doses to patients undergoing X-ray diagnosis, treatment, and follow-up for cerebral aneurysms. Radiation doses were measured for computed tomography angiography(CTA), cerebral angiography(CAG), and interventional neuroradiology(IVNR)by using small-sized silicon-photodiode dosimeters, which were implanted at various tissue and organ positions within an anthropomorphic phantom. Lens doses, brain doses, and effective doses obtained in this study were 26mGy, 67mGy, and 4.6mSv for CAG;77mGy, 250mGy, and 8.7mSv for IVNR;and 56mGy, 53mGy, and 1.5mSv for CTA. Entrance skin dose associated with mean fluoroscopy time and digital subtraction angiography frame was 0.82Gy for IVNR, which was less than the threshold dose of 2Gy for the onset of skin injury. The lens doses obtained with CTA, including non-contrast CT, was 106mGy, which was a factor of 4 higher than the dose of 26mGy for CAG. Effective dose for CTA was 1.5mSv compared to 4.5mSv for CAG. Patients with cerebral aneurysms received a cumulative lens dose of 543mGy throughout 3 years follow-up, which was over the estimated threshold of 0.5Gy for cataracts.


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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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