Sono-Photo Dynamic Therapy (SPDT)
Photodynamic therapy (PDT) is a form of phototherapy using nontoxic light-sensitive drugs (sensitizers) that are exposed selectively to light whereupon they cause malignant cells to die off. Sonodynamic therapy (SDT) makes use of therapeutic ultrasound instead of light to activate sensitizer compounds allowing a much deeper penetration to target cancer cells in the body. Photodynamic therapy (PDT) and sonodynamic therapy (SDT) may be used individually or in combination depending on the disease, stage of development, various individual circumstances, or other factors determined by the physician and the patient. When PDT and SDT are both used for treatment the therapy is sometimes referred to as Sono-Photo Dynamic Therapy (SPDT).