A Windows 7 system image would not be impacted by the distinction between a RAID array and non array setup (IDE is not the proper term btw). If you make a backup or system image it should be safe to restore that back onto a non-RAID array setup.
IDE is commonly misconstrued as the term which actually refers to ATA, the connection method used for HDDs and optical drives. If you'll note SATA is similar to ATA, as it builds on the ATA and SCSI technology. IDE is more of a concept of internal devices than a connection method.
RAID arrays are simply a method of organizing HDDs. It would be proper to call a drive not in a RAID array an individual drive, there is no technical term for it that I know of as the distinction isn't exactly defined by specifications or any sort of thing.