It is/was possible to scan directly the image you have created
Mr. Alt will provide you the detailed instructions
Though the basic is to right click on the drive and scan it
If you load/add the image, it will appear in the left pane and it will be exactly as if it was a physical disk.
So exactly as above, you'll right click the image and scan it.
Leave the scan to go over and check the result/s.
If you did a quick delpart and a quick format, all the files are still there.
If after the format process, you have added/written something on that drive, the corresponding size of overwritten data is lost.