According to the featurs of flat mirror images, the author of this article uses the principle of symmetrical pictures to totally transfer between the objet and the image, which is conducive to solving problems.

A coordinate transformation relation between imaging plane and the measured plane, and a expression of line length were built.

It is based on a multiplane imaging method which consists of plate reflecting mirrors and enables simultaneous imaging of ten planes with various optical paths on a single charge coupled device(CCD) array.

Measurement of stenotic mitral valve orifice area by real-time three-dimensional echocardiography biplane imaging;

Focal Plane Imaging is one of the most significant systems in millimeter wave imaging technology, as a result of the facts ,this technology has many advantages, such as real-time imaging, particularly for fast-moving targets, simple structure and easy implementation, it has been widely utilized in anti-terrorism security, scenes of surveillance, military reconnaissance and other fields.