A method for creating a full duplex fiber optic network using one single fiber optic cable of the multimode fiber type for simultaneous transmission and reception is described. The outer tube extends distal to the proximal affixation point and at least partially into the balloon segment to provide additional stiffness and pushability. One or more bids may be selected. The medical injector also includes an actuator having an engagement portion formed to engage one or more of the ratchet teeth. An image data readout section reads out image data on a color chart field corresponding to the calculated actual position.