SCSI's a dead technology. Really hasn't been produced for about 10 years. It's also pretty complex and was tough to put in a USB adapter. There were a few USB 2.0 to SCSI adapters made, but they were buggy and expensive. You might be able to find one on ebay, but no guarantees it will work or have drivers for your laptop/OS.
It looks like your scanner had a firewire option. If your laptop has an expresscard or cardbus slot, you can get a IEEE1394 (firewire) port to use the scanner. Those are still being made.
There's also a network adapter (For $350) you can buy for the scanner to use it on the network. That would be easy.
If this scanner is worth it and provides an important service for you, you also might consider setting up a cheap old desktop with an internal PCI SCSI card to scan from