Abstract: A method and appertaining system are provided for performing an image-assisted subject procedure. The method comprises obtaining at least a first and a second 2D projected image of a 3D subject from a first angle and a second angle. A user selects at least a first point and a second point in each of the first and second 2D images, and the system calculates 3D positions of the first point and the second point based on the selected points in the 3D images and the first and second angles. The, a 3D line is calculated between the first and second points. A further projected 2D image is created that includes the calculated 3D position of at least one of: a) one of the points; and b) the line. The subject procedure is then subsequently performed utilizing the further projected 2D image as a guide.