Defecography is a diagnostic imaging technique used to evaluate the anatomy and function of the rectum and anal sphincter muscles during defecation. It involves the use of fluoroscopy to visualize the movement of stool and the coordination of pelvic floor muscles during a bowel movement. Defecography is typically used to assess conditions such as pelvic floor dysfunction, rectal prolapse, and fecal incontinence. The procedure can provide valuable information to help guide treatment decisions and improve patient outcomes.