Which fixed focusing method uses an acoustic lens?

Which fixed focusing method uses an acoustic lens?

• A. Internal Focusing
• B. Acoustic Lens Focusing
• C. Mechanical Focusing
• D. External Focusing

Answer: (D)

Focusing in fixed-mode ultrasound is achieved by a designed element that shapes the beam so it converges at a single, pre-set depth. An acoustic lens focusing method uses a lens made of material with different acoustic properties than the surrounding medium. This lens sits in the beam path and refracts the sound waves, bending them toward a focal point so the waves meet at a fixed depth. Because the lens is fixed in place, the focal length doesn’t change during imaging. This differs from internal focusing, where the transducer’s own curved surface provides the focus; mechanical focusing, which uses movable parts to adjust the focus; and external focusing, which relies on other devices to shape the beam outside the transducer. So, the method that uses an acoustic lens is Acoustic Lens Focusing.

Focusing in fixed-mode ultrasound is achieved by a designed element that shapes the beam so it converges at a single, pre-set depth. An acoustic lens focusing method uses a lens made of material with different acoustic properties than the surrounding medium. This lens sits in the beam path and refracts the sound waves, bending them toward a focal point so the waves meet at a fixed depth. Because the lens is fixed in place, the focal length doesn’t change during imaging. This differs from internal focusing, where the transducer’s own curved surface provides the focus; mechanical focusing, which uses movable parts to adjust the focus; and external focusing, which relies on other devices to shape the beam outside the transducer. So, the method that uses an acoustic lens is Acoustic Lens Focusing.