Is There a Role of Photoacoustic Imaging in Sports Medicine: Evidence Today

Diagnostic imaging in sports medicine includes traditional imaging modalities such as x-ray, computed tomography (CT), and magnetic resonance imaging (MRI). Despite having certain advantages, these imaging techniques often have lower sensitivity and specificity, making it difficult to detect soft tissue injuries and early-stage cartilage damage. They also lack the ability to assess the biomechanical properties and functional states of tissues. Photoacoustic imaging (PAI) offers a powerful, non-ionizing, and cost-effective alternative to traditional imaging techniques in the diagnosis and therapeutic monitoring of sports injuries. PAI combines the benefits of optical imaging and ultrasound to provide high-resolution images of deep tissues, including tendons and ligaments. This technology uses pulsed lasers to irradiate tissues, causing thermal expansion and generating ultrasound waves, which are then captured and converted into images. PAI is particularly adept at depicting blood vessels and soft tissues with high resolution and sensitivity to the optical absorption contrasts of oxy- and deoxyhemoglobin. It can assess tissue oxygenation and metabolic activities, which are crucial for evaluating the healing process in sports injuries. Herein, the role of PAI in sports medicine is assessed and particularly its advantages over traditional imaging methods such as x-rays, CT scans, and MRI scans in diagnosing musculoskeletal injuries.