Which control is used to amplify echoes from deeper structures so that they appear as bright as similar structures located at shallower depths?

Which control is used to amplify echoes from deeper structures so that they appear as bright as similar structures located at shallower depths?

• A. Dynamic range
• B. TGC
• C. System shielding
• D. Master gain

Answer: (B)

Time Gain Compensation (TGC) is the control used to compensate for depth-related attenuation in ultrasound. As ultrasound waves travel deeper, they lose energy and the echoes become weaker. TGC lets you boost the gain selectively with depth, so echoes from deeper structures are amplified more than those from shallow tissues, making them appear as bright as similar structures closer to the transducer. You can shape the TGC curve to balance brightness across the image and improve visualization of deeper anatomy. Dynamic range controls the range of gray shades displayed and doesn’t address depth attenuation. Master gain increases all echoes equally, so it can’t equalize brightness across depths. System shielding isn’t an imaging control.

Time Gain Compensation (TGC) is the control used to compensate for depth-related attenuation in ultrasound. As ultrasound waves travel deeper, they lose energy and the echoes become weaker. TGC lets you boost the gain selectively with depth, so echoes from deeper structures are amplified more than those from shallow tissues, making them appear as bright as similar structures closer to the transducer. You can shape the TGC curve to balance brightness across the image and improve visualization of deeper anatomy. Dynamic range controls the range of gray shades displayed and doesn’t address depth attenuation. Master gain increases all echoes equally, so it can’t equalize brightness across depths. System shielding isn’t an imaging control.