That was an unreasonably long scan time and in the case of CT entailed very high exposure to radiation.

那时候扫描时间十分漫长，而且在CT检查时高暴露于放射线。

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A typical core is several metres long, so it is first subject to a rough and ready ct scan using a standard medical scanner.

典型的岩石核有几米长，因此首先要采用标准医学扫描仪对其进行粗略的CT扫描。

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It minimizes false positives and makes results easy to understand as a higher priority than increasing the breadth of a scan: this helps developers uncover issues early only as long as it saves time.

它将假阳性因素最小化，使结果更加容易理解，从而比增加监测幅面有更高的优先权：这样有助于帮助开发人员尽早发现问题，并且节省了时间。

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Meanwhile, mission specialist Charlie Camarda and pilot Jim Kelly have been continuing to inspect the shuttle for damage sustained during the climb to orbit, using the shuttle's 15m-long boom to photograph and scan Discovery's port wing.

BBC: The two astronauts spent nearly seven hours on the outside

Bartley will have a scan to determine how long he must spend out of action, but it could be as much as six weeks.

BBC: Rangers' Kyle Bartley misses cup final with knee injury

Founder Ali Stunt said that 80% of patients in Britain are not eligible for surgery at diagnosis because GPs do not recognise the symptoms, and it takes too long for patients to have a scan.

BBC: Radical surgery 'has kept me alive' says cancer sufferer