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Vimeo AEUS - Physics
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Which of the following statements is TRUE?
1 分
The word "piezo" as piezoelectric crystals means "heat"
Medical ultrasound is in the range of 2.5 - 15 MHz
A full bladder on ultrasound is isoechoic to the structures around it
Echoes from deeper anatomical structures take less time to return to the probe as compared to those from superficial structures
The ALARA acronym stands for "as large as reasonably achievable" and refers to the need for making sure the amount of radiation used in an imaging study is enough to create the best picture
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When scanning, probe orientation on screen vs. the probe indicator (X) on the patient can be confusing. Using the image labelled below, which of the following is true?
1 分
In the sagittal probe position: A = left side of patient, B = towards the head, C = right side of patient, D = towards the feet
In the transverse probe position: A= towards the head, B = patient anterior, C = towards the feet, D = patient posterior
In the sagittal probe position: A = right side of patient, B = patient anterior, C = left side of patient, D = patient posterior
In the coronal/frontal probe position: A = medial side of patient, B = towards the head, C = lateral side of patient, D = towards the feet
In the coronal/frontal probe position: A = towards the head, B = medial side of patient, C = towards the feet, D = lateral side of patient
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Regarding ultrasound modes, which of the following is FALSE?
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1 分
"Color" mode is a form of doppler mode
"B-mode" stands for brightness, meaning shades of gray
When using color mode, blue indicates that the frequency shift is towards the probe, and red indicates that it is moving away from the probe
Doppler mode can be presented as an auditory, color, or spectral display
"M-mode" stands for motion and is a time motion display of the ultrasound wave along a chosen line (cursor)
Which of following statements is TRUE?
1 分
The "zoom" function will close in on an area of interest while preserving image resolution
The "gain" button adjusts the intensity of signal returning to the machine is an inverse fashion - increased gain = decreased brightness
The "depth" button adjusts the how deeply the beams from the probe will penetrate the tissue - decreasing your depth will let you see deeper structures
Time gain compensation (TGC) is used to control image brightness at different levels of the US image (i.e. near field and far field)
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Which of the following statements is FALSE?
1 分
Ultrasound artifacts are usually secondary to poor operator skills and never help with making a diagnosis
Reverberation artifact is due to US beams bouncing between two highly reflective surfaces, and can be seen with foreign bodies and air in the lungs
Edge artifact is due to refraction of US beams in curved structures and will cause shadow, ex. cysts, bowel, gallbladder
Mirror artifact occurs when the US beam is not reflected directly back to the transducer after hitting a reflective surface, but rather takes an indirect return journey, ex. diaphragm, pericardium
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Which anatomic structure would be described as hyperechoic?
1 分
Bladder
Myocardium
Diaphragm
Liver
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