A system, comprising: a dose simulator in communication with an imaging system, the dose simulator comprising a user interface, a processor, and a non-transitory storage medium comprising programming instructions, wherein the programming instructions, if executed, enable the processor to cause the dose simulator to: receive patient information about the patient, wherein the patient information comprises information about one or more physical characteristics of the patient; receive scan data, wherein the scan data is generated during an imaging scan of the patient by the imaging system, wherein the imaging scan is a partial imaging scan of a portion of the patient, and wherein the scan data represents partial scan data covering the portion of the patient; assign, using the scan data, a material or tissue type to each of a plurality of voxels of the patient for which the scan data is available; estimate, using the patient information, a material or tissue type to each of a plurality of voxels of the patient for which scan data is not available; create a full body virtual dose model of the patient based upon the patient information and the partial scan data; receive a selection of a region of interest of the patient; perform a dose simulation on the virtual dose model of the patient or a portion thereof; and determine, based upon an outcome of the dose simulation, an estimate of the radiation dose received within the region of interest. a dose simulator in communication with an imaging system, the dose simulator comprising a user interface, a processor, and a non-transitory storage medium comprising programming instructions, wherein the programming instructions, if executed, enable the processor to cause the dose simulator to: receive patient information about the patient, wherein the patient information comprises information about one or more physical characteristics of the patient; receive scan data, wherein the scan data is generated during an imaging scan of the patient by the imaging system, wherein the imaging scan is a partial imaging scan of a portion of the patient, and wherein the scan data represents partial scan data covering the portion of the patient; assign, using the scan data, a material or tissue type to each of a plurality of voxels of the patient for which the scan data is available; estimate, using the patient information, a material or tissue type to each of a plurality of voxels of the patient for which scan data is not available; create a full body virtual dose model of the patient based upon the patient information and the partial scan data; receive a selection of a region of interest of the patient; perform a dose simulation on the virtual dose model of the patient or a portion thereof; and determine, based upon an outcome of the dose simulation, an estimate of the radiation dose received within the region of interest. receive patient information about the patient, wherein the patient information comprises information about one or more physical characteristics of the patient; receive scan data, wherein the scan data is generated during an imaging scan of the patient by the imaging system, wherein the imaging scan is a partial imaging scan of a portion of the patient, and wherein the scan data represents partial scan data covering the portion of the patient; assign, using the scan data, a material or tissue type to each of a plurality of voxels of the patient for which the scan data is available; estimate, using the patient information, a material or tissue type to each of a plurality of voxels of the patient for which scan data is not available; create a full body virtual dose model of the patient based upon the patient information and the partial scan data; receive a selection of a region of interest of the patient; perform a dose simulation on the virtual dose model of the patient or a portion thereof; and determine, based upon an outcome of the dose simulation, an estimate of the radiation dose received within the region of interest.