1. A method for representing image data of a patient, comprising: acquiring with at least one image recording device at least a first image data volume and a second image data volume of the patient; acquiring the first image data volume by way of a first imaging modality of said at least one image recording device, wherein the first image data volume acquired by way of the first imaging modality of said at least one image recording device comprises physical data indicative of varying opacity values of the first image data volume as physically recorded by way of said first imaging modality of said at least one image recording device; configuring the first imaging modality to image a vessel or structure of the patient; acquiring the second image data volume by way of a second imaging modality of said at least one image recording device, wherein the second image data volume acquired by way of the second imaging modality of said at least one image recording device comprises further physical data indicative of further varying opacity values of the second image data volume as physically recorded by way of the second imaging modality of said at least one image recording device, wherein one of the first and second imaging modalities magnetic resonance imaging; configuring the second imaging modality to image a surrounding structure relative to the vessel or structure imaged by the first image data volume; processing at least a portion of at least one of the first and second image data volumes with a selectable opacity, wherein the selectable opacity is configured to optimize a visualization of a spatial relationship of the vessel or structure relative to the surrounding structure, the visualization at least in part optimized to avoid an image obscuration of the vessel or structure by the surrounding structure; registering the first data volume with respect to the second data volume; and displaying a common image representation of the first and second data volumes, wherein the common image representation is effective to determine a spatial arrangement of the vessel or structure relative to the surrounding structure without obscuration of the vessel or structure by the surrounding structure based on the optimized visualization of the vessel or structure relative to the surrounding structure.