The subject will be asked to abstain from caffeine or caffeine-containing products the day of the scan in order to ensure an optimal rest heart beat < 80bpm. No other preparation is necessary for this procedure. The total length of this appointment is about 30 minutes, and most of this time is required to place ECG patches and to properly position the subject. The actual scan takes only 20 seconds. The technician will ask the patient to hold his breath for approximately 20 seconds while the scan is performed. The CAC scan will be administered by a trained technician at the Canada Diagnostic Centre located at 136-55 West 12th Avenue in Vancouver, BC. Except for the small amount of radiation the patient will be exposed to during this procedure there are no other known risks associated with this scan.