ARDMS Ultrasound Physics & Instrumentation Practice Exam

What impacts the spatial resolution of an ultrasound system primarily?

1. Transducer frequency

2. Intensity of the sound wave

3. Location of the image

4. Size of the transducer

The correct answer is: Transducer frequency

Spatial resolution in ultrasound imaging is primarily influenced by the transducer frequency. Higher frequency transducers produce shorter wavelengths, which allows for the ability to distinguish between closely spaced structures. This leads to improved detail in the images, allowing for better visualization of anatomical features. The intensity of the sound wave typically influences other aspects such as penetration and image brightness but does not directly affect spatial resolution. Similarly, the location of the image pertains more to the anatomical area being scanned rather than the resolution capability itself. The size of the transducer may affect other parameters such as field of view and beam shape but is not the primary determinant of spatial resolution. Thus, transducer frequency is the key factor in enhancing the ability to resolve fine details in ultrasound images.