How can Monoclonal Antibodies be Used to Diagnose Cancer?

-Give the Antibodies a Radioactive Element [Physics!!] -Give the now Radioactive Antibodies to the Patient via a Drip which allows it to go in the Blood and therefore Everywhere -When it Finds a Cancer Cell, it will Bind onto that Tumour Marker -A Picture can be Formed via some Camera that will Show the Radioactivity as a Bright Spot [So Bright Spot = Cancer Cell] -You can then see Where, How Big and If its Growing beyond.