Cylindrically curved slopes successively inner-reflect illumination light which reaches a back face or emission face of a light guide plate via an upper edge of an incidence face. The client prefetches page segments from the application server or the application server pushes additional page segments to the client. A pump is provided, and a multi-way valve is coupled in fluid communication with the biopsy sample extraction needle and the pump. Therefore, contrast can be greatly improved, and a time for a reset period can be reduced.