What is calculated by axial tomography?
Calculated axial tomography, also called computer tomography, Cat Scan or CT Scan, is a medical diagnostic technology that creates pictures of internal body structures. These scanning use X -ray technology passing through the computer to display part of the body. X -rays, the type of electromagnetic radiation with short wavelengths, are rebuilt by a targeted part of the body from several different angles. Zaostřovací bod vychází jako jasný, trojrozměrný nebo průřezový obraz a ostatní tkáně v oblasti jsou rozmazané, což lékaři usnadňuje rozlišení cílených tkání. The calculated axial tomography is commonly used to diagnose the conditions or damage to soft tissues or bones in the head, chest, joints, colon, lungs and hearts. These rays are absorbed in the body at different degrees of organs inside, the screen captures more or less X -rays. This leaves on the screen powered particles that document tissues inside, while thicker tissues show a whiter, less dense tissueThey show the grayer and the background appear black. This image then passes through the computer and creates a two -dimensional image of the body.
The calculated scanning axial tomography works in a similar way, but rotates with an X -ray source around targeted tissue to obtain many cross -sectional X -ray images of the focus. These images are then compiled to create a 3D picture of the tissue concerned. However, it can be imagined that the image made up of all these flat scanning taken from so many different angles would be complex and difficult to distinguish. To solve this problem with Cat Scan, the rays around the body spin so that the targeted tissue is always in focus, but the surrounding tissues are blurring.
Modern X -ray machine for CT scan usually looks like a large box or a circle with a donut in the middle. The patient is placed on a table that moves to the machine to explore the area to be pto explore. A radiation technologist, a professional trained in radiology, asks the patient to stay calm while the test is going to ensure the brightest results. It usually takes thirty to an hour and a half to complete the procedure, although it may be more or less time -consuming depending on the patient. In some cases, the contrast dye may be injected to the patient before the scan to allow better viewing of the blood vessels.
Axial tomography can be used on many parts of the body. In the head, doctors use CT scanning to diagnose tumors, deformities, aneurysm and related conditions, infections, problems with bone density in the skull and to control bleeding or fractures of bones. Chest X -rays can help diagnose autopsy or crack in the aorta, pulmonary embolism or blocking of pulmonary artery, pneumonia, lung cancer and other lung abnormalities. Special calculated axial tomographic technique also allows you to take pictures of the heart in the procedure called withRdeční ct scan. These are usually trying to exclude coronary arteries as the causes of chest symptoms.
Cat scans are also carried out on joints to explore fractures and abdomen and pelvis to look for infections, kidney stones, tumors, intestinal obstacles and other abnormalities. These tests should not cause any pain, although some patients may be uncomfortable to remain over the entire length of the procedure. The amount of radiation, usually used in computer axial tomography, does not pose a high risk for adults, but may increase the likelihood of cancer development in children. Lower settings have been developed for use in children, although it is recommended that they receive magnetic resonance imaging or ultrasound instead of CT scan, if possible. Pregnant women should avoid exposure to radiation unless necessary.