Which characteristic is true about Quantitative Ultrasound (QUS)?

• A. It measures bone mineral content (BMC)
• B. It does not measure BMC or area
• C. It requires a water bath for accurate measurements
• D. It uses ionizing radiation

Answer: (B)

Quantitative Ultrasound (QUS) is a technique primarily focused on assessing bone status without the use of ionizing radiation or the direct measurement of bone mineral content (BMC). It works by evaluating the propagation of ultrasound waves through bone, which reflects the bone's density and quality.

The defining characteristic of QUS is that it does not directly measure BMC or the surface area of the bone. Instead, it provides information on bone density through parameters such as velocity of sound and broadband ultrasound attenuation, which indirectly correlate with bone quality. Thus, stating that it does not measure BMC or area accurately captures the essence of what QUS evaluates.

The other options involve direct measurements or requirements not associated with QUS. For instance, QUS does not rely on ionizing radiation, and it generally does not require a water bath for its assessments; instead, it can often be conducted in air. This offers an advantage in clinical settings where radiation exposure is a concern, allowing for safe and effective evaluations of bone health.