How to dynamically load a Base64 string to an image on the Crystal Report?

I have a signature stored in my SQL Server 2008 DB as a Base64 encoded string. It is in a datatype of nvarchar(MAX), field named ="signature_stream"

I am using Crystal Reports Basic for Visual Studio 2008.a XML field definition file to load the data to the report.  In that file [signature_stream] is a xs:string type.  This is a asp.net application so ideally I would like not to have to save the image to disk before showing it.

I need to be able to take [signature_stream] and load it onto my report from server side code. 

Any help would greatly be appreciated.