Answer #42

The correct answer is D: Backing material. The backing material is used to decrease ringing and decreases spatial pulse length improving axial resolution. It does not change image amplitude.

Transmit voltage determines how much power the ultrasound has as it exits the transducer and goes to the patient. TGC gains,or transducer receiver gains are settings on the machine the user can alter to change the amplification of the signal the machine receives, with a goal to modify the brightnes of the image displayed on the screen.