DMS 101 Exam III 2026 – Diagnostic Medical Sonography Concepts and Imaging
Study Guide
Array - correct answer ✔✔ Transducer assembly with multiple elements
Specular Reflector - correct answer ✔✔ Large relative to wavelength, flat, smooth boundary
Non-Specular Reflector - correct answer ✔✔ Small relative to wavelength, rough boundary
Rayleigh Scattering - correct answer ✔✔ Diffusion of sound equally in all directions
(Requires a structure with dimensions far smaller than that of the beam's wavelength)
Channel - correct answer ✔✔ Combination of active element, wire, and system electronics
(Specific elements or group of elements working as one)
Mechanical Focusing - correct answer ✔✔ Internal and External
Internal Focusing - correct answer ✔✔ Achieved through use of a curved element
External Focusing - correct answer ✔✔ Achieved through use of an acoustic lens (mirror)
Electronic Focusing - correct answer ✔✔ All arrays use electronic focusing (it is operator
adjustable)
Linear Sequential Array - correct answer ✔✔ Voltage pulses are applied to groups of elements
in succession
(Large acoustic footprint, creates rectangular images)
Study Guide
Array - correct answer ✔✔ Transducer assembly with multiple elements
Specular Reflector - correct answer ✔✔ Large relative to wavelength, flat, smooth boundary
Non-Specular Reflector - correct answer ✔✔ Small relative to wavelength, rough boundary
Rayleigh Scattering - correct answer ✔✔ Diffusion of sound equally in all directions
(Requires a structure with dimensions far smaller than that of the beam's wavelength)
Channel - correct answer ✔✔ Combination of active element, wire, and system electronics
(Specific elements or group of elements working as one)
Mechanical Focusing - correct answer ✔✔ Internal and External
Internal Focusing - correct answer ✔✔ Achieved through use of a curved element
External Focusing - correct answer ✔✔ Achieved through use of an acoustic lens (mirror)
Electronic Focusing - correct answer ✔✔ All arrays use electronic focusing (it is operator
adjustable)
Linear Sequential Array - correct answer ✔✔ Voltage pulses are applied to groups of elements
in succession
(Large acoustic footprint, creates rectangular images)
