Hello, and welcome to the Apple Discussion forums!
_Exactly what make/model scanner do you have?_ Most scanners should work fine with Macs, even if the software that came with yours is pc only.
Have you tried connecting the scanner to your Mac? Can your Mac 'see' it?
(Go to +> About this Mac > More Info > Hardware > USB.+ ) Is your scanner listed there? (Assuming it's connected via USB). If your Mac can see the scanner, try opening Image Capture. Is your scanner listed there?
As far as I know, you can't scan directly into iPhoto. Use software such as Ed Hamrick's excellent
ViewScan to do your scanning; then import the images into iPhoto. ViewScan is excellent and will work with just about any scanner.