What is the z-axis in CT scan?
Abstract. BACKGROUND AND PURPOSE: Z-axis automatic exposure control (AEC) technique automatically adjusts tube current based on size of body region scanned.
What is Z-axis collimation in MM?
Therefore the z-axis collimation (also referred to as the “detector collimation”) would be 0.75mm.
What is a helical CT?
Listen to pronunciation. (HEE-lih-kul kum-PYOO-ted toh-MAH-gruh-fee) A procedure that uses a computer linked to an x-ray machine to make a series of detailed pictures of areas inside the body. The x-ray machine scans the body in a spiral path.
What is detector in CT scan?
Detectors collect information regarding the degree to which each anatomic structure attenuated the beam during a CT Scan Machine. Instead of film to record the attenuated beam digital x-ray detectors collect the information in CT Scans. “Detector” refers to a single element or type of detector used in a CT Scan system.
What is 320 Slice Heart Scan?
The 320 Slice CT scan system offers a non invasive method to detect early Coronary artery disease, which may eventually cause narrowed or blocked vessels in the heart. With the help of accurate images of the walls of the blood vessels, your doctor can advise you on how to prevent further narrowing of vessels.
What is 16-slice CT scan?
The 16-Slice CT Scanner captures multiple images of a patient’s anatomy in a matter of seconds and presents information 3-dimensionally. This means the images of the body are now taken much faster, therefore reducing the examination time and increasing your comfort.
What is a CT slice?
The term slice refers to the number of rows of detectors in the z-axis of a CT. For example, in an 8-slice CT, there are eight slices of data captured for each rotation of the gantry. The first CT scanners offered single slice CT (SSCT) images but now there are multiple-slice CT scanners (MSCT.)
What causes excess z axis radiation in CT?
One factor that leads to excess z-axis radiation and patient dose is overranging, defined as the difference between the planned scan length and the exposed scan length. Overranging is an integral feature of helical CT and is affected by collimation, pitch and section width (9).
How can we ameliorate the problem of excess z-axis radiation?
These problems should be ameliorated with continuing education. One factor that leads to excess z-axis radiation and patient dose is overranging, defined as the difference between the planned scan length and the exposed scan length. Overranging is an integral feature of helical CT and is affected by collimation, pitch and section width (9).
How common is radiation from CT scans?
The use of CT has risen dramatically during the past decade, and with this has come an increased population radiation burden, possibly accounting for up to 2% of cancers (1) (2) (3).