SDX Voluntary Breath Holding Device

**Semantic type:** Medical Device

**Definition:** A voluntary deep inspiration breath-hold device for managing thoracic and abdominal tumor motion during imaging and radiation therapy. The device is comprised of a sensor connected to a mouthpiece and spirometer. Patient feedback can be set by using nose clips to force breathing from the mouth, and video goggles allow the patient to watch their own spirometry pattern to improve breath holding.

**Synonyms:** - SDX