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VTNE
Chapter 8: Alternative Imaging Technology
| Question | Answer |
|---|---|
| A mode | amplitude mode |
| B mode | britghness mode |
| artifacts | something seen on a ultrasound image that anatomically does not exist |
| anechoic | the image is black, such as in fluids(no echoes) |
| Attenuation | reduction of the intensity of an x-ray beam as it traverses matter. |
| Attenuationis caused by | ` absorption, reflection, scattering, refraction |
| Echoic | (echogenic) creates echoes |
| Endoscopy- | use of an illuminated optical instrument to visualize the interior of the body and its organs. |
| Hypercheic- | structure is lighter than the surrounding tissue or organ(lots of echoes) |
| Hypoecheic | -the image is darker than the surrounding tissue(less of echoes) |
| Isoechic- | the image is the same echogenicity as compared to another organ |
| MRI stands for | Magnetic rensoance image |
| MRI | uses radio waves, a powerful magnet, and a computer to make a series of detailed pictures of areas inside the body. |
| M mode | motion mode |
| CT stands for | omputed tomography |
| CT | used to obtain detailed internal images of the body. |
| Transducer- | device that produces sound waves that bounce off body tissues and make echoes |
| fluoroscopy- | diagnosing (finding out the cause of) a health problem such as heart or intestinal disease |
| reverbration | occurs when an ultrasound pulse gets "trapped" between two strong parallel reflectors. |
| ultrasonography | noninvasive procedure based on changes in sound waves pf frequency that cannot be heard but respond to changes in tissues composition |
| Sound waves are charterized by | wavelengths and frequencies |
| velocity= | wavelength*frequency |
| Echogenicity- | quality of being able to send back an echo and then showing as a light area in an ultrasound scan |
| Nuclear sctingraphy | -is used to diagnose, stage, and monitor disease |
| Which best describes the appearance of a hyperechoic lesion on a ultrasound- | brighter than surrounding tissue |
| What si the advantage of using 7.5 MHz transducer over a 5 Mhz transducer | -it penetrates more deeply |
| Acoustic impendacne is- | ability of tissue to resist or impede sound waves |
| Which fo the following occurs when the ultrasound beam interacts with a large curvilinear interface such as the diaphragm and liver border | -acosutic shadowing |
| A tech is preparing to do a ultrasound exam of a dogs abdomen, crearting images in the trasnverse plane. Which fo the following radiographic images will this plane represent | -ventrodorsal |
| Which description most accutarlty fits the appearance of normal adrenal glands on ultrasound- | hypoechoic |
| If a tech is preparing to take a sagittal ultrasound image, which way shoul the probe be oriented- | cranial to caudal |
| Which organ is the most difficult to image and correlate sonographic appearance with the presence or absence of disease | pancreas |
| Which contributes to obtaining a clear sonographic image of the liver in a deep chested dog- | probe angled crainaly at xipoid process |
| Identify the correct order of the 5 wall layers in the small intestine- | muscosal surface, mucosa, submucosa, muscularis serosa |
| In which suspected condition is CT preferred to MRI- | vertebral fracture |
| Identify the msot accurate desportion of a solid lesion on ultrasound- | no internal echoes |
| An endoscopic study performed by the rigid scope is which of the following- | rhinoscopy |
| The endoscope is immersed at the end of the day with which oif the following dilute solution- | cidex |
| Which artifact occurs where theis is minimal attenuation of the beam as it passes through a fluid filled structure- | reverberation |
| Echogencity is defined as- | sound transmitted back to probe |
| Which organ is most associated with acoustic shadow and reverbration artifact- | prostate |
| Which substance creates the greatest barrier to sound transmission | blood |
| What is the best term for lass of intensity of the ultrasound beam as it travels through tissue- | absoption |
| Lung metastasis is the best visualized using | CT |
Created by:
Alex1324