What is CT/CTA?
Computed tomography (CT), originally known as computed axial tomography (CAT) or body section roentgenography, is a medical imaging method employing tomography. Digital geometry processing is used to generate a three-dimensional image of the internals of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. The word "tomography" is derived from the Greek tomos (slice) and graphia (describing). CT produces a series of axial images that can be manipulated through a process known as windowing in order to recreate the image in a different plane.
With the advent of subsecond rotation combined with multi-slice CT (up to 64 slices), high resolution and high speed can be obtained at the same time, allowing excellent imaging of the coronary arteries. Images with a high temporal resolution are formed by updating a proportion of the data set used for image reconstruction as it is scanned. In this way individual frames in a cardiac CT investigation are significantly shorter than the shortest tube rotation time. It is uncertain whether this modality will replace the invasive coronary catheterization.
How long does a CT scan take?
The duration of a CT scan itself, when you are on the scanning table, is about 15 minutes. However, it is 45 minutes for the entire appointment. The time spent when you are not on the scanning table is used to prepare you for the exam by placing an IV in your arm and talking with the nurse about your previous medical history. During your scan you are able to talk to the CT staff at any time should you become uncomfortable in any way.
What you should know about radiation exposure?
CT scanners use x-rays. Modern CT scanners are designed to ensure the consistent reduction of radiation exposure to patients and staff. The CT scanner at Cardiac Study Center offers an optimal combination of low radiation exposure and short examination time while maintaining excellent image quality.
Contrast dye-Why?
A contrast dye will be given intravenously to enhance the images of your heart. The dye used is an iodine-based liquid that ravels to your organs and blood vessels making them much more visible on the CT scan. You may feel a warm to hot sensation when the dye enters your body. Please let the nurse or the technologist know if you have any known drug, shellfish, or contrast dye allergies.
