据传儿童做CT扫描有致癌风险
<p><span word="A">A</span> <span word="new">new</span> <span word="study">study</span> <span word="offers">offers</span> <span word="the">the</span> <span word="most">most</span> <span word="solid">solid</span> <span word="evidence">evidence</span> <span word="to">to</span> <span word="date">date</span> <span word="that">that</span> <span word="radiation">radiation</span> <span word="from">from</span> <span word="CT">CT</span> <span word="scans">scans</span> <span word="increases">increases</span> <span word="children">children</span>'<span word="s">s</span> <span word="risk">risk</span> <span word="of">of</span> <span word="developing">developing</span> <span word="leukemia">leukemia</span> <span word="and">and</span> <span word="head">head</span> <span word="and">and</span> <span word="neck">neck</span> <span word="cancer">cancer</span>.</p><p>一项新研究提供了迄今为止最确凿的证据，证明<span word="CT">CT</span>扫描产生的辐射将增加儿童罹患白血病和头颈部癌症的风险。</p><p><span word="Children">Children</span> <span word="and">and</span> <span word="adolescents">adolescents</span> <span word="who">who</span> <span word="received">received</span> <span word="two">two</span> <span word="to">to</span> <span word="three">three</span> <span word="computed">computed</span> <span word="tomography">tomography</span> <span word="scans">scans</span> <span word="of">of</span> <span word="the">the</span> <span word="head">head</span> <span word="were">were</span> <span word="three">three</span> <span word="times">times</span> <span word="as">as</span> <span word="likely">likely</span> <span word="to">to</span> <span word="develop">develop</span> <span word="brain">brain</span> <span word="cancer">cancer</span> <span word="as">as</span> <span word="those">those</span> <span word="in">in</span> <span word="the">the</span> <span word="general">general</span> <span word="population">population</span>, <span word="according">according</span> <span word="to">to</span> <span word="the">the</span> <span word="study">study</span> <span word="of">of</span> 176,587 <span word="children">children</span>.</p><p>6月6日《柳叶刀》（<span word="Lancet">Lancet</span>）杂志网站发表了这项对176,587名儿童所进行研究的结果，研究显示，接受过二至三次<span word="CT">CT</span>扫描的儿童和青少年患脑癌的概率是普通人的三倍，接受过五至10次头部<span word="CT">CT</span>扫描的儿童患白血病的风险则是普通人的三倍。</p><p><span word="The">The</span> <span word="study">study</span>, <span word="published">published</span> <span word="online">online</span> <span word="Wednesday">Wednesday</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Lancet">Lancet</span>, <span word="also">also</span> <span word="said">said</span> <span word="the">the</span> <span word="risk">risk</span> <span word="of">of</span> <span word="contracting">contracting</span> <span word="leukemia">leukemia</span> <span word="was">was</span> <span word="three">three</span> <span word="times">times</span> <span word="as">as</span> <span word="great">great</span> <span word="for">for</span> <span word="children">children</span> <span word="who">who</span> <span word="received">received</span> <span word="five">five</span> <span word="to">to</span> 10 <span word="CT">CT</span> <span word="scans">scans</span> <span word="of">of</span> <span word="the">the</span> <span word="head">head</span>.</p><p>这项研究的作者强调，整体患癌概率仍然非常低，而且<span word="CT">CT</span>扫描的直接好处（例如检查头部损伤）仍然大于风险。</p><p><span word="The">The</span> <span word="study">study</span>'<span word="s">s</span> <span word="authors">authors</span> <span word="emphasized">emphasized</span> <span word="that">that</span> <span word="the">the</span> <span word="overall">overall</span> <span word="likelihood">likelihood</span> <span word="of">of</span> <span word="getting">getting</span> <span word="the">the</span> <span word="cancers">cancers</span> <span word="remained">remained</span> <span word="very">very</span> <span word="small">small</span> <span word="and">and</span> <span word="that">that</span> <span word="the">the</span> <span word="immediate">immediate</span> <span word="benefits">benefits</span> <span word="of">of</span> <span word="the">the</span> <span word="scans">scans</span>, <span word="such">such</span> <span word="as">as</span> <span word="in">in</span> <span word="detecting">detecting</span> <span word="head">head</span> <span word="injuries">injuries</span>, <span word="still">still</span> <span word="outweigh">outweigh</span> <span word="the">the</span> <span word="risks">risks</span>.</p><p>这项研究发现，每接受一次<span word="CT">CT</span>扫描，患癌风险就随之升高，即使对于只接受过一次<span word="CT">CT</span>扫描（以前被称为<span word="CAT">CAT</span>扫描）的人，风险也有升高。</p>
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