<qa>  What is the image rate of the probe?In the study a pCLE ColoFlex probe will be used Cellvizio; Mauna Kea Technology, Paris, France. The probe goes through the accessory channel of a conventional endoscope. The image rate is 0.08 sframe at 1024×1024 pixels with a imaging depth of 20 μm. The confocal images will be first analyzed during the endoscopy. Then, the images will be digitally stored and reviewed after the procedure in order to zoom in on details for a higher magnification approximately 10000 fold, with special designed software package Cellvizio Viewer, allowing image correction and stabilization. 