1. A method for associating coronary angiography image annotations with a SYNTAX score for assessment of coronary artery disease comprising: receiving and processing, by a system comprising one or more processors, a plurality of angiogram videos from a coronary angiography study into a plurality of frames for each of the plurality of angiogram videos; extracting, by the system, a key frame from the plurality of frames for each of the plurality of angiogram videos, wherein extracting the key frame for each of the plurality of angiogram videos comprises detecting, by the system, a presence of a contrast agent in one or more frames of the plurality of frames of each given angiogram video, and using edge detection, edge curve following and pairing of curves on opposing sides of an artery to identify a representative frame of the given angiogram video having extended parallel curves; displaying to a user, by the system via a browsing interface, each of the extracted key frames; in response to receiving a selection from the user of a key frame from the displayed key frames, displaying, by the system via a video view interface, the angiogram video that is associated with the selected key frame; receiving, by the system, a lesion annotation from the user for a frame of the angiogram video; based on receiving the lesion annotation, displaying, by the system, a SYNTAX score questionnaire in the video viewer interface; based on receiving answers to the SYNTAX score questionnaire from the user, annotating, by the system, the frame of the angiogram video with the answers to the SYNTAX score questionnaire from the user; saving, by the system, the answers to the SYNTAX score questionnaire with the annotated frame in a database; computing and displaying a SYNTAX score for the lesion based on the answers to the SYNTAX score questionnaire; and generating a lesion report for a selected lesion that shows the answers of the SYNTAX score questionnaire for the selected lesion along with one or more frames illustrating the selected lesion.