[development] Referencing imagecache

I need to include an imagecache preset of an image in a form that is being created in a module.The image is a cck imagefield. There are two array elements in the cck information in the node containing name information. 'filename' is incorrect, because it lacks the _0 suffix that was appended to the physical file. 'filepath' contains the correct file name, but would require me manipulating the path to insert the imagecache path. I can do that, but wonder if I'm missing a more streamlined method.