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CT scan questions with correct answers rated 100%.
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CT scan questions with correct answers rated 100%.computed tomagraphy ANS - -merges x-ray technology with the computer to provide detailed digital cross-sectional images of the body relatively free from superimposition of the different tissues. -revolutionized the ability to visualize soft tissues
principles of CT ANS - -employs x-rays that are attenuated by body tissues. the radiodensities of the tissues are represented in the image as shades of gray
-creates images based on cross-sectional (axial) slices, created by up to 1000 projections from different angles
components of CT scanner ANS - 1: the gantry: contains the x ray tube
2:operator's console
3: the computer
the detectors ANS - -x rays are attenuated by body tissues and then exit the pt's body as remnant radiation, similar to conventional radiography.
-up to 1000 detectors are arranged in an array, encircling the pt, for the purpose of measuring this remnant radiation
-modern units have 4-16 arrays
data anquisition system ANS - -amplifies the signal from the detectors
-incoming signal is in the form of a varying electrical current= ANALOG SIGNAL
-system converts it from analog to digital form and then sends it to the computer
scout image ANS - 2 dimensional digital radiograph-localizes the structures to be scanned
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