求翻译：This type of technology has been around for decades. What makes the Dilon camera the first of its kind is that unlike traditional gamma cameras, which are quite large with thick enclosure walls, the Dilon units are small. The size of the camera and the thin enclosure wall allow it to be positioned close to the body for higher resolution. The camera is also portable and can be used for general nuclear medicine applications.是什么意思？

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