Which of the following frequencies is typically used in diagnostic ultrasound?

Prepare for the Sonography Entrance Exam. Study with quizzes and multiple choice questions, each featuring hints and thorough explanations. Excel on your test!

The range of frequencies that is typically used in diagnostic ultrasound is indeed between 2 to 18 MHz. This frequency range is particularly effective for medical imaging as it provides a good balance between penetration and resolution. Higher frequencies, such as those found in this range, yield better image resolution, which is crucial for identifying smaller structures within the body.

When higher frequencies are used, ultrasound waves are absorbed more rapidly, limiting their penetration, but the quality of the detail in the image improves significantly. This makes the 2 to 18 MHz range suitable for various types of examinations, including superficial structures like muscles and vascular imaging, as it allows for clear visualization of small anatomical details.

In contrast, frequencies outside this range may either perform poorly in imaging capabilities or may not be suitable for general diagnostic purposes. Frequencies lower than 2 MHz, while they can penetrate deeper tissues, do not provide adequate resolution for detailed imaging. Frequencies above 18 MHz, on the other hand, may not penetrate tissues effectively enough for many diagnostic procedures and are often used for specialized applications. Thus, the 2 to 18 MHz range represents the optimal choice for diagnostic ultrasound.

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