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8.1 Ultrasound in biomedical engineering 183
FIGURE 8.1 Ultrasound frequencies for medical application.
a higher protein content will absorb US far more efficiently [2]. Fig. 8.2 depicts the
ultrasound absorption in different tissues.
Bone is at the upper end of this scale, due to the majority of US energy is reflected
from them. The best absorbing tissues are those with high collagen content include
ligament, scar tissue, fascia, tendon, and joint capsule [3]. The application of thera-
peutic US to tissues with a more highly absorbing material is more effective than the
other tissues.
Ultrasonic waves have many applications in the field of health. The most impor-
tant applications are the diagnosis and treatment of the disease, drug delivery, and
