Manu Stephen, Suntharos Patcharapong, Boyle Gerard J, Wang Lu, Prieto Lourdes R
Department of Pediatric Cardiology, M 41 9500 Euclid Avenue, Cleveland, OH 44195 USA.
J Invasive Cardiol. 2018 Jan;30(1):28-33. Epub 2017 Oct 15.
Radiation dose was compared between two modern imaging systems with different x-ray tube technology (Megalix vs Gigalix) and detector type (amorphous vs crystalline silicon) at the same institution.
Further reduction in radiation dose than currently reported may be achievable with advances in x-ray tube and detector technology.
Radiation dose (air kerma, dose-area product [DAP]) was retrospectively compared for post-transplant pediatric patients undergoing right heart catheterization/biopsy (fluoroscopy only) or "annual" catheterization with coronary angiography in one of two imaging systems between January 2014 and December 2016. Comparisons were also made with published radiation doses.
A total of 122 right heart catheterizations with biopsy were performed in the Megalix/amorphous silicon (Si) lab and 168 in the Gigalix/crystalline Si lab. Age and weight were not statistically different for the two groups. There was a 50% decrease in median air kerma (2.2 mGy vs 1.1 mGy; P<.001) and 66% decrease in median DAP (52.2 μGy•m² vs 18.0 μGy•m²; P<.001) for the Gigalix/crystalline Si lab. A total of 24 "annual" catheterizations were performed in the Megalix/amorphous Si lab and 22 were performed in the Gigalix/crystalline Si lab. There was a 57% reduction in median air kerma (458.6 mGy vs 198.6 mGy; P<.001) and a 46% reduction in median DAP (2548.0 μGy•m² vs 1367.1 μGy•m²; P<.01) for the Gigalix/crystalline Si lab. Similar reductions were found on comparison with published doses.
The Gigalix tube and crystalline Si detector decrease radiation dose by 50%-60% for fluoroscopy and cine acquisition in pediatric patients.
在同一机构中，比较两种采用不同X射线管技术（Megalix与Gigalix）和探测器类型（非晶硅与晶体硅）的现代成像系统之间的辐射剂量。
随着X射线管和探测器技术的进步，可能实现比目前报道的更低的辐射剂量。
回顾性比较2014年1月至2016年12月期间在两种成像系统之一中接受右心导管检查/活检（仅透视）或“年度”导管检查及冠状动脉造影的移植后儿科患者的辐射剂量（空气比释动能、剂量面积乘积[DAP]）。还与已发表的辐射剂量进行了比较。
在Megalix/非晶硅实验室共进行了122例右心导管检查及活检，在Gigalix/晶体硅实验室进行了168例。两组的年龄和体重无统计学差异。Gigalix/晶体硅实验室的中位空气比释动能降低了50%（2.2 mGy对1.1 mGy；P<0.001），中位DAP降低了66%（52.2 μGy•m²对18.0 μGy•m²；P<0.001）。在Megalix/非晶硅实验室共进行了24例“年度”导管检查，在Gigalix/晶体硅实验室进行了22例。Gigalix/晶体硅实验室的中位空气比释动能降低了57%（458.6 mGy对198.6 mGy；P<0.001），中位DAP降低了46%（2548.0 μGy•m²对1367.1 μGy•m²；P<0.01）。与已发表剂量比较发现了类似的降低。
Gigalix管和晶体硅探测器可使儿科患者透视和电影采集的辐射剂量降低50%-60%。
