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Principles of Image Resolution Flashcards

7 cards from real ARDMS SPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Principles of Image Resolution flashcards as text

  1. Which factor primarily determines the lateral resolution of an ultrasound beam?

    Answer: Beam width at the focal zone

    Lateral resolution equals the beam width at any given depth, so it is best at the focal zone where the beam is narrowest.

  2. A transducer operating at 10 MHz will have _____ axial resolution compared to one operating at 5 MHz.

    Answer: Better

    Higher frequency produces shorter wavelengths and shorter pulses, improving axial resolution.

  3. Elevational (slice-thickness) resolution is primarily controlled by:

    Answer: Fixed focus in the elevation plane

    Most arrays cannot steer or focus electronically in the elevation plane, so slice thickness is fixed by the lens curvature.

  4. Increasing the number of focal zones in a linear array will:

    Answer: Improve lateral resolution throughout the image at the cost of frame rate

    Multiple transmit focal zones improve lateral resolution over more depths but require multiple firings, reducing frame rate.

  5. The spatial pulse length (SPL) is calculated as:

    Answer: Number of cycles × wavelength

    SPL = number of cycles × wavelength; shorter SPL yields better axial resolution.

  6. Which type of resolution describes the ability to distinguish two structures side by side perpendicular to the beam axis?

    Answer: Lateral

    Lateral resolution refers to resolving structures side by side (perpendicular to the beam direction).

  7. A heavily damped transducer will produce:

    Answer: Shorter pulses and better axial resolution

    Heavy damping reduces ringing, shortening the pulse and thus improving axial resolution.