Dear Friend,
The solution that I have used in my plugins is th find the source image directory and then 'copy' the dicom file from the Clearcanvas directory to my own.
An example of the code would be:
ImageSop imageSop = ((IImageSopProvider)image).ImageSop;
ILocalSopDataSource localsource = (ILocalSopDataSource)imageSop.DataSource;
File.Copy(localsource.Filename, path + "\\" + imageSop[DicomTags.SopInstanceUid] + ".dcm");
If you want a more detailed example, or perhaps even a solution to the problem you are trying to solve, you could take a look at some of my plugins. Clipboard Dicom Tools' has a tool to save files to a directory from the clipboard. If you are interested in a study level copy, you could use the 'RenameStudy' plugin as a starting point to grab the ImageSOPs and then copy them.
Good luck,
Seth