What are the units of longitudinal resolution?

Study for the SPI exam. Use flashcards and multiple choice questions, each with hints and explanations. Prepare effectively for your sonography certification!

Multiple Choice

What are the units of longitudinal resolution?

Explanation:
Longitudinal (axial) resolution is a measure of distance along the beam axis—the smallest separation between two reflectors that can be distinguished. Because it describes a physical distance, its units must be units of length. The other options represent frequency (Hertz), impedance (Rayls), and speed (m/s), none of which express length. Feet, a unit of length, correctly conveys this measure. In practice axial resolution is often given in millimeters, but any length unit works; the key is that it’s a distance, not a frequency, impedance, or speed.

Longitudinal (axial) resolution is a measure of distance along the beam axis—the smallest separation between two reflectors that can be distinguished. Because it describes a physical distance, its units must be units of length. The other options represent frequency (Hertz), impedance (Rayls), and speed (m/s), none of which express length. Feet, a unit of length, correctly conveys this measure. In practice axial resolution is often given in millimeters, but any length unit works; the key is that it’s a distance, not a frequency, impedance, or speed.

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