RT Book, Section A1 Schrope, Beth A2 Schrope, Beth SR Print(0) ID 57917328 T1 Chapter 16. Therapeutic Ultrasound T2 Surgical and Interventional Ultrasound YR 2014 FD 2014 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-176762-0 LK accesssurgery.mhmedical.com/content.aspx?aid=57917328 RD 2024/04/24 AB One of the chief reasons for using ultrasound as a diagnostic modality relates to its superior safety profile, where the principle of ALARA (as low as reasonably achievable) yields great information at low energy. Yet, when ultrasound energy is employed at higher powers, it offers a number of therapeutic possibilities. Not needing the high frequencies required for imaging resolution also permits greater depth of penetration if desired.