ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

TGC stands for Time Gain Compensation and it is the ultrasound system function that enables the sonographer to adapt to the amount of attenuation that occurs with increasing depth. TGC allows the sonographer to manually adjust the amplification of the returning echoes at different depths, compensating for the attenuation of the ultrasound beam as it travels deeper into the body. This adjustment helps to maintain consistent image brightness and quality throughout the entire depth of the image.

Options A, B, and C are not the correct answers because:

- Focusing is the adjustment of the ultrasound beams to a specific focal point to improve image resolution in that specific area, not for adjusting to attenuation with increasing depth.

- Receiver gain refers to the overall amplification of the returning echoes and does not specifically adapt to the attenuation with increasing depth.

- Output power determines the strength of the ultrasound beam emitted by the transducer and does not directly adapt to attenuation changes with depth.