ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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Which type of resolution is NOT typically assessed with a tissue-equivalent phantom?

Axial
Contrast
Horizontal
Temporal

The correct answer is: Temporal

When assessing image quality in medical sonography using a tissue-equivalent phantom, various types of resolutions are typically evaluated. Axial resolution refers to the ability to distinguish two structures that are close together along the axis of the ultrasound beam. Contrast resolution relates to the ability to differentiate between tissues with varying echogenicity or brightness. Horizontal resolution is the ability to distinguish structures perpendicular to the ultrasound beam. Temporal resolution, on the other hand, is related to the ability to distinguish moving structures in real-time, reflecting the rate of image frames displayed per second. This type of resolution is more dependent on the ultrasound system's performance rather than phantom assessment. Therefore, temporal resolution is not typically assessed with a tissue-equivalent phantom, making it the correct answer in this context.