The application of ultrasound technology in rehabilitation therapy has garnered increasing popularity among physical therapists, with a growing body of evidence supporting its use. As an emerging rehabilitation technique, ultrasound imaging presents numerous challenges, including the lack of standardized operating procedures, unclear operational parameters, and intervention responses, which necessitate further exploration. This study aims to provide an overview of the application of ultrasound technology in physical therapy–assisted rehabilitation. It covers various rehabilitation fields such as postpartum recovery, musculoskeletal pain rehabilitation, and speech and swallowing rehabilitation. The study introduces the concept of rehabilitative ultrasound imaging (RUSI) and its application in visualizing patient dysfunction and treatment responses. Additionally, it highlights the role of this technology as a biofeedback tool in physical therapy and discusses the limitations of RUSI to enhance physical therapists’ understanding of its application.