Which of the following will require the highest levels of time gaincompensation?A: 10MHz near fieldPoints: 1/1B: 10MHz far fieldC: 5MHz near fieldD: 5MHz far field
B
The correct answer is option B: 10MHz far field.
Time Gain Compensation (TGC) is a technique used in ultrasound imaging to adjust the amplification of the returned echoes from different tissue depths. The deeper the tissue, the weaker the reflected signal is, therefore, TGC amplifies the received echoes from deeper tissue layers.
The far-field is the region in an ultrasound image away from the transducer, where the sound beam diverges and spreads out. It is also the region where the sound waves travel the longest distance before they are reflected back to the transducer. Hence, the higher the frequency of the ultrasound beam, the greater is the attenuation of the sound waves in the tissue, and the weaker is the echo returned to the transducer.
Therefore, 10MHz far field signal will require the highest levels of TGC compensation, as more amplification is needed to compensate for the attenuation of the sound wave in the tissues at this frequency and depth.
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