* Chest pain is one of the most common symptoms of heart disease. This could be due to narrowing in heart's blood vessels, which needs to be investigated. * Currently, people with a low risk of narrowing of heart vessels usually have a CT scan of the heart first. This scan is good at identifying those who do not have significant narrowing. However, the scan has some drawbacks, such as exposure to a small amount of radiation. * We are exploring if ultrasound of the neck vessels might give us similar kind of information as the CT scan. * You will be asked to attend the hospital for one visit to have an ultrasound scan of your neck. * The findings of your neck vessels will be compared with the CT scan of your heart vessels to see if there is a similarity.
Age > 18 years old
Symptomatic patients with suspected CCS, judged by the clinician to require CTCA with CAC scoring, for the diagnosis of CAD
Have a RF-CL 5-15%, as calculated using ESC guidelines
Able to give informed consent to participate in the study and its follow up
Age <18 years old
Diagnosed ACS requiring hospitalization or urgent or emergent testing
Known CAD with prior MI, PCI, CABG or any angiographic evidence of CAD (≥50% lesion in a major epicardial vessel)
History of previous stroke or known peripheral vascular disease