Only relatively pristine material has the goods Landman is after, so his team USES a scanning electron microscope (below), which utilizes a beam of electrons to image surfaces, to find the best nacre.

只有相对原始状态的材料才拥有兰德曼所需要的研究对象，因此他的研究小组必须使用利用电子束表面成像的扫描电子显微镜(下图)去寻找最好的珍珠层。

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Low power scanning electron microscope image of tooth surface, computer-coloured yellow on blue background.

牙齿表面的电子显微镜扫描图。

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A single pair of beams does not, however, produce a useful image. To do that requires scanning the object beam through the target about a hundred different ways.

不过仅利用一对光束并不能得到有用的图像，还需要从大约100个不同的角度让物体光束扫描目标。

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Patients with subretinal light sensitive implants, however, perceive the shapes of objects naturally from the first day of implantation onwards without reorganisation of the spatial assignments of electrodes by an image processor and without scanning movements of the head.

FORBES: Second Test Of Retinal Implant Shows Restored Vision To The Blind

Efforts are under way in the U.S. to curb overuse of CT scanning in children, including the Image Gently initiative, launched in August 2009 and spearheaded by a coalition of health-care organizations dedicated to changing medical practice.

WSJ: Childhood CT Scans Pose Cancer Risk