1. A method for achieving a desired dose distribution comprising: obtaining at least one treatment planning image from a patient to determine the relative location of target and sensitive structures; preparing a treatment plan for the patient based on the at least one treatment planning image, the treatment plan including a planned dose distribution; obtaining at least one three-dimensional image from the patient in substantially a treatment position, the three-dimensional image including anatomical data and being used for volumetric dose calculations; comparing the at least one treatment planning image and the at least one three-dimensional image; and adjusting how the dose is received by the patient based on the comparison.