A system for energy delivery into a patient comprising: imaging means configured to image the patient and provide an image signal; an energy source (500, 510, 730, 900, 1100); and a processor configured to: receive the image signal, the image signal being an input that is related to a position of a blood vessel; determine a three dimensional coordinate of a blood vessel based on the image signal; and control the energy source based on the determined coordinate of the blood vessel; wherein the energy source (500, 510, 730, 900, 1100) is configured to deliver ultrasound energy from external to the patient to one or more nerves in multiple regions (1350, 1680) around the blood vessel (1140, 1155, 1340), and at an adequate energy level to create an annular zone of nerve inhibition around the blood vessel (1140, 1155, 1340); wherein the system further comprises a controller for the energy source; characterised in that the processor is further configured to control the energy source by: determining an output related to a position of the nerve based on a model that associates blood vessel (1140, 1155, 1340) position with nerve position; and providing the output to the controller, so that the controller can cause the energy source (500, 510, 730, 900, 1100) to deliver the ultrasound energy from outside of the patient to the nerve. imaging means configured to image the patient and provide an image signal; an energy source (500, 510, 730, 900, 1100); and a processor configured to: receive the image signal, the image signal being an input that is related to a position of a blood vessel; determine a three dimensional coordinate of a blood vessel based on the image signal; and control the energy source based on the determined coordinate of the blood vessel; receive the image signal, the image signal being an input that is related to a position of a blood vessel; determine a three dimensional coordinate of a blood vessel based on the image signal; and control the energy source based on the determined coordinate of the blood vessel; wherein the energy source (500, 510, 730, 900, 1100) is configured to deliver ultrasound energy from external to the patient to one or more nerves in multiple regions (1350, 1680) around the blood vessel (1140, 1155, 1340), and at an adequate energy level to create an annular zone of nerve inhibition around the blood vessel (1140, 1155, 1340); wherein the system further comprises a controller for the energy source; characterised in that the processor is further configured to control the energy source by: determining an output related to a position of the nerve based on a model that associates blood vessel (1140, 1155, 1340) position with nerve position; and providing the output to the controller, so that the controller can cause the energy source (500, 510, 730, 900, 1100) to deliver the ultrasound energy from outside of the patient to the nerve. determining an output related to a position of the nerve based on a model that associates blood vessel (1140, 1155, 1340) position with nerve position; and providing the output to the controller, so that the controller can cause the energy source (500, 510, 730, 900, 1100) to deliver the ultrasound energy from outside of the patient to the nerve.