A non-transitory computer-usable medium having a sequence of instructions stored thereon which, when executed by a processor, causes said processor to execute a process for estimating the size, location, and position of a medical device to be applied within a vessel of a patient, the sequence of instructions comprising:
- generating a longitudinal image of the vessel by stacking cross-sectional frames as an imaging transducer assembly is being pulled back within the vessel;
- simultaneously displaying the longitudinal image in a first window and one of the cross-sectional frames of the longitudinal image in a second window on a display;
- and
- generating a user interface comprising a graphical palette, the graphical palette comprising a plurality of longitudinal graphical representations of a medical device generated in at least two different sizes, each of the plurality of longitudinal graphical representations having predefined dimensions, wherein the user interface is configured and arranged to enable a user to select and drag a longitudinal graphical representation of the plurality of longitudinal graphical representations to a selected location in the first window, and wherein when the selected longitudinal graphical representation is dragged to a portion of the first window that includes the cross-sectional frame of the second window a cross-sectional graphical representation of the medical device is overlaid onto the second window.