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Terms in this set (37)

1.) Dead zone
2.) Axial resolution
3.) Lateral resolution: Same as with TO's. Uses nylon line instead of metal rods.
4.) Depth calibration accuracy(vertical-in the direction of beam): Same as with TO's. Uses
nylon line instead of metal rods.
5.) Lateral calibration accuracy(horizontal-perpendicular to beam): Same as with TO,s. Utilize rod group e from face A. All rods should be equally spaced(perpendicular to the beam) and have a specific distance across all of the rods. Orientation of the transducer may cause a change so this test should be repeated utilizing rod group c from face C. If inconsistent, than the machine or the speed of the material in the TEP may be off. Check temperature of TEP. Test with distance markers and check with the electronic grid.
6.) System sensitivity(maximum depth): Measures the maximum depth or penetration of the beam. Maximum penetration is related to system sensitivity.
7.) Dynamic range: The difference between the minimal gain used to display a rod and the maximum. Any rod used.
8.) Uniformity or compensation(TGC): Same as with TO's. Uses nylon line instead of rods.
Contrast resolution: Compare shades of grays from multiple cylindrical shaped reflectors. Display vs hard copy vs side bar.
9.) Lesion detection: Cystic vs solid masses. Size(vertical and horizontal), depth, shape(round), fill-in(slice thickness or beam diameter), shadowing, enhancement and contrast should be monitored.
10.) Registration: Utilizes all sides and reflectors.
11.) Dot markers: Dots on a media that are separated by specific distances.
12.) Electronic grid: An electronic ruler projected on the display screen to verify distances.
13.) Calipers or distance indicators: Use electronic grid and test device. Measurements should be taken vertically and horizontally.