Focusing with the electronics of the ultrasound system is an example of which focusing type?

Focusing with the electronics of the ultrasound system is an example of which focusing type?

• A. External focusing
• B. Phased array focusing
• C. Internal focusing
• D. Dynamic focusing

Answer: (B)

Electronic focusing relies on controlling the timing of signals across multiple small transducer elements to shape the beam. A phased array uses that principle: each element’s pulse is delayed by a precise amount so that the waves from all elements arrive in phase at a chosen focal point, creating a constructive interference that concentrates energy there. By adjusting those delays, the system can not only focus at different depths but also steer the beam without moving the transducer. This is different from external focusing, which uses a physical lens placed outside the element, or internal focusing, which relies on a built-in lens or curved crystal inside the transducer itself. Because it uses electronic timing across the elements to form and steer the beam, this focusing type is phased-array focusing.

Electronic focusing relies on controlling the timing of signals across multiple small transducer elements to shape the beam. A phased array uses that principle: each element’s pulse is delayed by a precise amount so that the waves from all elements arrive in phase at a chosen focal point, creating a constructive interference that concentrates energy there. By adjusting those delays, the system can not only focus at different depths but also steer the beam without moving the transducer. This is different from external focusing, which uses a physical lens placed outside the element, or internal focusing, which relies on a built-in lens or curved crystal inside the transducer itself. Because it uses electronic timing across the elements to form and steer the beam, this focusing type is phased-array focusing.