How does the Achilles test unit work?
The Achilles measures the bone density of the heel. The heel is used because its structure provides measurements comparable to DEXA measurements of the hip and spine. Using high frequency sound waves, the Achilles Express measures both the speed of sound and broadband ultrasound attenuation. This means that it analysis the density of the bone by measuring both how fast sound travels through it, and how much of the sound reaches the other side. Ultrasound does not travel through air. If you’ve had an ultrasound test before, it is likely that a heavy gel was used between the sensor and the body. The gel works as an acoustic coupling through which the sound waves travel. The Achilles uses water to obtain the best possible results. Water is not only an ideal coupling solution, but in the Achilles Product it is thermally controlled to 92 for consistent results. This is important because temperature variations can affect ultrasound measurements.
