1. A method for boundary visualization superimposed on a scan image, comprising the steps of: a) generating phantom image measurements of at least one synthetic calibration object in relation to a patient's body to calibrate a scanner, where the at least one synthetic calibration object is calibrated for size and shape so that by generating the measurements of images of the at least one synthetic calibration object in relation to a patient's body, characterization of the scanner system variation parameters can be obtained; b) acquiring a first image of an object on the calibrated scanner, wherein the object is a nodule; c) computing and marking a boundary of the nodule on the first image; d) displaying the first image with the nodule boundary superimposed over the first image; e) presenting the initial nodule boundary to a user for modification where the user can add one or more modification points to the image to create a modified nodule boundary that is encompassed by the one or more modification points; e) once the user has marked the one or more modification points on the image, computing an updated nodule boundary that adapts to include the new points; and f) repeating steps c)-f) by replacing the nodule boundary with the updated boundary until the user is satisfied with the boundary.