ARDMS Ultrasound Physics & Instrumentation Practice Exam 2025 - Free Ultrasound Practice Questions and Study Guide

The primary frequency range for diagnostic ultrasound falls between 1 to 20 MHz. This range is optimal for producing images of sufficient quality for medical imaging, particularly in areas such as obstetrics, cardiology, and abdominal imaging. Frequencies at the lower end of this spectrum (around 1-3 MHz) are typically used for deeper structures in the body, as lower frequencies penetrate tissues better but yield lower resolution images. In contrast, higher frequencies, such as those in the 5-20 MHz range, provide better resolution but have a reduced ability to penetrate deeper tissues.

This broad frequency range allows for adaptability based on the specific clinical requirements, as different types of examinations may benefit from different frequencies depending on the depth and detail required. The other choices present narrower ranges that do not encompass the broad applicability of 1-20 MHz, limiting the imaging potential and resolution necessary for various diagnostic needs.