Inclusion Criteria:

• * To be eligible for the study: (All answers must be "YES" for subject to be eligible.)
• 1. Referred for a clinically indicated CCTA scan.
• 2. Patient aged older than 18.
• 3. Subject must provide written informed consent prior to any study-related procedures being performed.
• 4. Subject must be willing to comply with all clinical study procedures.
• 5. Atypical or typical complaints of angina.
• 6. No previous cardiovascular history.
• 7. Possibility of 'flash' mode scan; patient heart rate below 70 beats per minute and regular rhythm.

Exclusion Criteria:

• * The presence of the following excludes subjects from the study: (All answers must be "NO" for subject to be eligible.)
• 1. Contraindications for CT coronary angiography, including:
• 1. Inability to perform a breath hold for at least the expected scan time
• 2. Unstable angina
• 3. Hemodynamic instability
• 4. Known history of CAD
• 5. Pregnancy
• 6. Renal insufficiency (defined as Creatinine \<1.5 mg/dL or GFR\<30 mL/min)
• 7. Iodine allergy
• 2. Insufficient cannula venous access (preferred 18G, minimal 20G cannula)
• 3. Subject has an acute psychiatric disorder.
• 4. Subject is unwilling to comply with the requirements of the protocol.
• 5. Subject has previously entered this study.