A method performed by one or more computing systems for augmenting image data with a patient source location of a heart disorder of a heart of a patient, the method comprising: receiving image data that includes a 3D CT image of the heart of the patient and a patient substrate location of a patient substrate having a patient substrate volume; adding to the 3D CT image an indication of the patient substrate location and the patient substrate volume by setting of intensities within the patient substrate volume based on an intensity that would not normally be found in a 3D CT image of a heart, wherein the indication of the patient substrate location and of the patient substrate volume is referred to as a substrate mask and to add the substrate mask, voxels are identified and the intensity of each identified voxel is set to a substrate intensity as an indication that the voxel is part of the patient substrate; receiving a patient cardiogram of the patient; identifying a patient source location of a heart disorder for the patient based on mappings of cardiograms to source locations, wherein the patient source location is a source location mapped to a cardiogram that is similar to the patient cardiogram, wherein each cardiogram is associated with a simulated cardiac geometry; aligning a simulated cardiac geometry associated with the cardiogram that is similar to the patient cardiogram to a patient cardiac geometry of the heart of the patient as represented by the 3D CT image of the heart; transforming the patient source location to a source location on the 3D CT image; adding the transformed patient source location to the 3D CT image; and providing the augmented image data to a planning system to inform care of the patient. receiving image data that includes a 3D CT image of the heart of the patient and a patient substrate location of a patient substrate having a patient substrate volume; adding to the 3D CT image an indication of the patient substrate location and the patient substrate volume by setting of intensities within the patient substrate volume based on an intensity that would not normally be found in a 3D CT image of a heart, wherein the indication of the patient substrate location and of the patient substrate volume is referred to as a substrate mask and to add the substrate mask, voxels are identified and the intensity of each identified voxel is set to a substrate intensity as an indication that the voxel is part of the patient substrate; receiving a patient cardiogram of the patient; identifying a patient source location of a heart disorder for the patient based on mappings of cardiograms to source locations, wherein the patient source location is a source location mapped to a cardiogram that is similar to the patient cardiogram, wherein each cardiogram is associated with a simulated cardiac geometry; aligning a simulated cardiac geometry associated with the cardiogram that is similar to the patient cardiogram to a patient cardiac geometry of the heart of the patient as represented by the 3D CT image of the heart; transforming the patient source location to a source location on the 3D CT image; adding the transformed patient source location to the 3D CT image; and providing the augmented image data to a planning system to inform care of the patient.