Radioactive seed with multiple markers and method for using same

A method of treating an affected region of diseased tissue in a patient, the method comprising:

• implanting a plurality of first radioactive seeds in the affected region, each of the first radioactive seeds having a sealed housing with an internal cavity, at least one carrier body disposed within the cavity for maintaining a first radioisotope source at a first dosage and a plurality of X-ray detectable markers placed along a length of the cavity in a first configuration;
• implanting a plurality of second radioactive seeds in the affected region, each of the second radioactive seeds having a sealed housing with an internal cavity, at least one carrier body disposed within the cavity for maintaining a second radioisotope source at a second dosage and a plurality of X-ray detectable markers placed along a length of the cavity in a second configuration distinguishable from the first configuration;
• generating an X-ray image of the affected region including the first and second radioactive seeds implanted therein, the X-ray image providing representations of the first and second configurations which are visibly distinguishable;
• and
• associating each representation of the first configuration with a seed having one of the first radioisotope source and the first dosage, and associating each representation of the second configuration with a seed having one of the second radioisotope source and the second dosage.