Question
Imaging procedure shown in the photograph:
A. CT venography
B. Contrast Venography
C. Doppler USG
D. MRI venography
Show Answer
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Correct Answer » C Explanation |
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Ans:C.)Doppler USG.
Doppler Ultrasonography:
- A Doppler ultrasound is a noninvasive test that can be used to estimate the blood flow through your blood vessels by bouncing high-frequency sound waves (ultrasound) off circulating red blood cells. A regular ultrasound uses sound waves to produce images, but can’t show blood flow.
- Doppler effect helps to assess whether structures (usually blood) are moving towards or away from the probe, and its relative velocity.
- It should be noted here that there are no standards for the display of color Doppler.
- Some laboratories show arteries as red and veins as blue.
- Other laboratories use red to indicate flow toward the transducer and blue away from the transducer.
- Still other laboratories prefer to display the red shift representing longer waves of echoes (scattered) from blood flowing away from the transducer; and with blue representing the shorter waves of echoes reflecting from blood flowing toward the transducer.
- Because of this confusion and lack of standards in the various laboratories, the sonographer must understand the underlying acoustic physics of color Doppler.