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7 Cards in this Set

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x-ray, extremely shortwave electromagnetic radiation moves through the body exposing a photographic plate to form a radiograph. Ex. Cavity in a tooth - they give only a flat, two-dimensional image of the body.
Identify and describe
ultrasound, uses high-frequency sound waves. The waves are emitted from a transmitter-receiver placed on the skin over the area to be scanned. The sound waves strike internal organs and bounce back to the receiver on the skin. The computer analyzes the pattern of sound waves and the info is transfered to the monitor, where the result is visualized as an ultrasound image called a sonogram.
Identify and Describe
Computed tomographic scan, originally called (CAT) scans are computer-analyzed x-ray images. Al low intensity x-ray tube is rotated through a 360-degree arc around the patient, and the images are fed into a computer. The computer then constructs the image of a ""slice"" throught the body at the point where the x-ray beam was focused and rotated
Identify & describe
Digital subtraction angiography (DSA), a 3-D radiographic image of an organ such as the brain is made and stored in a computer. A radiopaque dye is injected into the circulation, and a second radiographic computer image is made. The first image is subtracted from the second one, greatly enhancing the differences, with the primary difference being the presence of the injected dye. (to guide a catheter into a carotid artery)
Identify & describe
Magnetic resonance imaging (MRI, directs radio waves at a person lying inside a large electromagnetic field. The magnetic field causes the protons of various atoms to align. Because of the large amounts of water in the body, the alignment of hydrogen atom protons is at present most important in this imaging system. Radio waves of certian frequencies, which change the allignment of the hydrogen atoms, then are directed at the parient. When the radio waves are turned off, the hydrogen atoms realign in accordance with the magnetic field.(detecting some forms of cancer and tumors)
Identify & describe
Position emission tomographic (PET) scans, can identify the metabolic states of various tissues. (analyzing the brain)
Identify & describe
Dynamic spatial reconstruction (DSR)
DSR uses about 30 x-ray tubes. The images from all the tubes are compiled sumultaneously to rapidly produce a 3-D image.