Necessary to Delete Image in Table View?

Is it necessary to delete images in an image view in a table view before loading another image? I know with a regular image view it keeps a reference count every time an image is loaded which increases memory usage. With the table view I’m using my script deletes all the data rows before loading new ones. Is this effectively reducing the reference count or do I need to “delete image of image view…” with a reference to the image view in the table?

Just want to make it as efficient as possible!