Therefore, information from different phases of the cardiac cycle is gained and can be used.
This is especially useful for cine-sequences which show the heart motion throughout the cardiac cycle. They do however retain their clinical relevance in patients with arrhythmia and for volumetry and functional analysis. Since cardiac CT is mostly performed to evaluate coronary artery anatomy and not functional anatomy, several innovations have been introduced during the last two decades to significantly reduce radiation dose from cardiac CT. This technique also called step-and-shoot mode is based on the principle that several images acquired at different heart phases and anatomic regions of the heart can be combined for reconstruction of the whole heart.
Why do people have MDCT?
Dual-source CT scanners allow for a gapless acquisition with a pitch of up to 3. A high-pitch spiral acquisition can be performed in less than one second and thus information from a single heartbeat can be generated.
In combination with iterative reconstruction techniques, high-pitch spiral acquisition allows for cardiac CT with sub-milliSievert doses. It should be noted that all prospectively ECG-gated protocols are more susceptible to deterioration of image quality due to motion artifacts. Therefore, when choosing such a protocol, the patient's heart rate should ideally be below 65 beats per minute bpm. In high-pitch spiral acquisition, the heart rate should even be below 60 bpm. Therefore, the cost of significant dose reduction is the limited patient population that such protocols can be applied to.
Due to the usually tortuous anatomy of the coronary arteries, curved multiplanar reconstructions MPR or maximum intensity projections MIP are usually generated to allow for assessment of coronary lumina on a dedicated workstation.
In these images, coronary stenoses can be evaluated and lumen reduction can be measured. Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys.
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About Blog Go ad-free. Wichmann et al. On this page:. Anatomy of the heart at multidetector CT: what the radiologist needs to know.
Radiographics full text - doi Please talk with your doctor if you have specific concerns. Angiography is a technique for obtaining images of blood vessels and heart structures using an injection of contrast dye in the bloodstream. Ultra-fast CT scanners are available that capture images of the heart, the coronary arteries and all the blood vessels of the body. Locating and determining the size of aneurysms are important functions of CT angiography. Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view.
It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs. What is cardiac computed tomography CT?
Cardiac (computed tomography) CT Services – Monash Heart
Intermountain Healthcare. Steven C. Cardiologist Heart Specialist. Memorial Hospital of Tampa.
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A cardiac computerized tomography CT scan makes three-dimensional pictures of the heart.
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