110960
Description
Flashcards by lizarawlins0809, updated more than 1 year ago
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Created by lizarawlins0809
almost 11 years ago
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| Question | Answer |
| Acoustic enhancement | "Increased echo amplitude" or "posterior through transmission" visualized posterior to a structure that does not attenuate (decrease, stop, impede, or absorb) the sound beam. Considered a type of sonographic artifact. |
| ALARA (as low as reasonably achievable) | The prudent use of diagnostic sonography; dictates that the output level and exposure time to ultrasound is minimized while obtaining diagnostic data |
| Anterior (ventral) | Situated at or directed toward the front. A structure in front of another structure. Ex. The head of the pancreas is anterior to the IVC. |
| Acoustic impedance | Resistance a material provides to the passage of sound waves. Ex. Bone portrays more acoustic impedance than tissue. |
| Acoustic shadows | "Reduced echo amplitude" or echo "drop off" posterior to a structuure that attenuates (decreases, stops, impedes, or absorbs) the sound beam. Margins of the shadow are generally sharp and well-defined. Considered a type of sonographic artifact. |
| Anechoic | Term used to describe an echo-free appearance on a sonographic image. Ex. A true cyst appears anechoic. |
| Artifact | Image artifacts are echo features or structures observed on ultrasound images that are unassociated with the object being imaged. Ex. Acoustic shadows are 1 type of sonographic artifact. |
| Ascites | Accumulation of serous fluid anywhere in the abdominopelvic cavity |
| Attenuation | Decrease in the intensity of the sound beam as it passes through a structuure, caused by absorption, scatter, or beam divergence. |
| Axial (short axis) (view or section) | At right angles to longitudinal sections. Ex. Axial views of the aorta may be seen in transverse scanning plance images. Axial sections of the pancreas can be visulized in sagittal scanning plane images of the mid hypogastrium. |
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