A system for providing information of a vessel of a patient to assist in evaluating the vessel, the system comprising: at least one instrument sized and shaped for introduction into the vessel of the patient; a processing unit in communication with the at least one instrument, the processing unit configured to: obtain physiology measurements through the vessel of the patient from the at least one instrument; provide the physiology measurements to a risk calculator; wherein said risk calculator is configured to calculate a risk score associated with the obtained physiology measurements, wherein the risk score is at least one of a SYNTAX score, a fractional flow reserve -guided SYNTAX score (functional SYNTAX score), an indication of perfusion benefit, and an indication of graft patency; and output the physiology measurements and the risk score and an image of the vessel on a display in communication with the processing unit, wherein the output image of the vessel further includes visualizations based on the obtained physiology measurements; wherein the output image of the vessel includes numerical values of a pressure ratio of the obtained pressure measurements from the at least one instrument; wherein the output image of the vessel includes a heat map representative of pressure ratios of the obtained pressure measurements from the at least one instrument; and wherein a first visual characteristic of the heat map is associated with pressure ratios above a threshold value and a second visual characteristic of the heat map is associated with pressure ratios below the threshold value, wherein one or more transition points of the vessel are determined, wherein the pressure ratios between portions of the vessel change by a threshold amount, wherein the one or more transition points are indicated by markings on the output image. at least one instrument sized and shaped for introduction into the vessel of the patient; a processing unit in communication with the at least one instrument, the processing unit configured to: obtain physiology measurements through the vessel of the patient from the at least one instrument; provide the physiology measurements to a risk calculator; wherein said risk calculator is configured to calculate a risk score associated with the obtained physiology measurements, wherein the risk score is at least one of a SYNTAX score, a fractional flow reserve -guided SYNTAX score (functional SYNTAX score), an indication of perfusion benefit, and an indication of graft patency; and output the physiology measurements and the risk score and an image of the vessel on a display in communication with the processing unit, obtain physiology measurements through the vessel of the patient from the at least one instrument; provide the physiology measurements to a risk calculator; wherein said risk calculator is configured to calculate a risk score associated with the obtained physiology measurements, wherein the risk score is at least one of a SYNTAX score, a fractional flow reserve -guided SYNTAX score (functional SYNTAX score), an indication of perfusion benefit, and an indication of graft patency; and output the physiology measurements and the risk score and an image of the vessel on a display in communication with the processing unit, wherein the output image of the vessel further includes visualizations based on the obtained physiology measurements; wherein the output image of the vessel includes numerical values of a pressure ratio of the obtained pressure measurements from the at least one instrument; wherein the output image of the vessel includes a heat map representative of pressure ratios of the obtained pressure measurements from the at least one instrument; and wherein a first visual characteristic of the heat map is associated with pressure ratios above a threshold value and a second visual characteristic of the heat map is associated with pressure ratios below the threshold value, wherein one or more transition points of the vessel are determined, wherein the pressure ratios between portions of the vessel change by a threshold amount, wherein the one or more transition points are indicated by markings on the output image.