Why are phantoms used in ultrasound quality assurance?

• A. To calibrate and verify image quality, depth accuracy, and measurement against known standards.
• B. To generate random noise in the image.
• C. To replace patient testing.
• D. To increase Doppler sensitivity.

Answer: (A)

Phantoms are used in ultrasound quality assurance because they provide a stable, known reference that mimics tissue and contains targets at precise depths with known echogenicity and attenuation. This lets the system’s image quality, depth accuracy, and measurement tools be checked against fixed standards, so you can verify that images are accurate and measurements are trustworthy. By comparing what the machine displays to the known values in the phantom, you can detect drift, issues with resolution, or calibration errors and take corrective action.

Some phantoms can test Doppler performance by including moving targets, but the main point is to establish and verify overall system performance against known benchmarks. The other options don’t fit this purpose: random noise would undermine image quality, phantoms aren’t used to replace patient testing, and while Doppler testing can be done with phantoms, increasing Doppler sensitivity isn’t the fundamental aim of QA phantoms.