1. A system, comprising: a catheter having a proximal and a distal end, the distal end insertable into a living body and configured to optically image a body tissue, comprising: an elongated tubular member comprising an opening for introducing a fluid to the body tissue; and an inner core configured to slide within the elongated member; a control system configured to rotate the inner core within the elongated member radially around a center axis and configured to translate the inner core axially along the center axis; and an optical imaging system coupled to the imaging core, wherein the optical imaging system is configured to acquire optical images from the imaging core at a rate greater than or substantially equal to 520 frames per second.