Fixed focusing is commonly contrasted with dynamic focusing. Which of the following terms is associated with fixed focusing?

Fixed focusing is commonly contrasted with dynamic focusing. Which of the following terms is associated with fixed focusing?

• A. Conventional Focusing
• B. Dynamic Focusing
• C. Phased Focusing
• D. Adaptive Focusing

Answer: (A)

Conventional focusing is the term that aligns with fixed focusing. In fixed focusing, the beam is set to converge at a single, predetermined depth using the transducer’s geometry or fixed delays. That means the focal point doesn’t change as you image at different depths, so lateral resolution is optimized only at that particular depth and can worsen away from it. Dynamic focusing, by contrast, adjusts transmit and receive delays as depth changes, creating multiple focal zones and improving resolution across the image. Phased focusing refers to electronic delays to steer and shape the beam, which can be part of dynamic focusing, while adaptive focusing involves adjusting focus based on tissue characteristics.

Conventional focusing is the term that aligns with fixed focusing. In fixed focusing, the beam is set to converge at a single, predetermined depth using the transducer’s geometry or fixed delays. That means the focal point doesn’t change as you image at different depths, so lateral resolution is optimized only at that particular depth and can worsen away from it. Dynamic focusing, by contrast, adjusts transmit and receive delays as depth changes, creating multiple focal zones and improving resolution across the image. Phased focusing refers to electronic delays to steer and shape the beam, which can be part of dynamic focusing, while adaptive focusing involves adjusting focus based on tissue characteristics.