One or more devices, systems, methods and storage mediums for optical imaging medical devices, such as, but not limited to, Optical Coherence Tomography (OCT), single mode OCT, and/or multi-modal OCT apparatuses and systems, and methods and storage mediums for use with same, for viewing, controlling, updating, and emphasizing imaging modalities, for performing angio delay determination to find relative delay difference(s) between angio image(s) and another modality image(s), and/or for performing synchronization technique(s) are provided herein. One or more embodiments provide at least one intuitive Graphical User Interface (GUI), method, device, apparatus, system, or storage medium to comprehend information, to improve or maximize accuracy in one or more images and to perform angio delay (or delay time) determination and/or synchronization. In addition to controlling one or more imaging modalities, the GUI may operate for one or more applications, including, but not limited to, angio delay measurement(s), synchronization, co-registration, and imaging.