Registration of nuclear medicine images

A method of registering a functional image to a structural diagnostic image comprising:

• providing a functional emission nuclear image of a patient as a functional image;
• providing a first structural image of said patient;
• providing a second structural image, said second structural image comprising a nuclear medicine image and having a known positional relationship to said functional nuclear image;
• finding a first mapping transformation between said first and second structural images;
• determining a second mapping transformation between said functional image and said first structural image based on said first mapping transformation and said known positional relationship;
• and
• gating at least said functional image to at least one of a patient's body rhythms.