NASA hit the challenge hard. The space agency built a bird radar to scan for flocks that could fly through a shuttle?s launch path and pose an impact risk.

NASA下定决心要解决这一问题，宇航局建立了一座鸟类雷达，以扫描航天飞机发射路径上是否有可能造成冲撞的鸟群。

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So the risk from the scan is about the same as the thing you're trying to prevent.

所以，扫描带来的威胁和它所要尽力防止的威胁是一样大的。

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“The goal is to do a scan on someone before they get the disease and be able to tell if they’re at higher risk or starting to deteriorate, ” she said.

“我们的目标是在某人患上老年痴呆病之前， 对他的脑部进行扫描，从而预先告知他们是否处于较高疾病风险或情况开始恶化，”她说。

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The report found cancer risk grew with each scan received, and there was an elevated risk even in those who received only one CT, also known as a CAT scan.

WSJ: Childhood CT Scans Pose Cancer Risk

What you get back from the scan is a report showing the risk you run, relative to the average, of contracting the various conditions tracked.

ECONOMIST: Peering into your medical future is risky

In Wednesday's study, patients who already had cancer diagnoses or who developed cancer within two years of a CT scan were excluded, to decrease the likelihood that risk calculations would be inflated by patients who would have developed cancer without getting a CT scan.

WSJ: Childhood CT Scans Pose Cancer Risk