What imaging method is typically used to diagnose diverticulitis?

The most effective imaging method for diagnosing diverticulitis is CT abdomen/pelvis with oral contrast. This modality is favored because it provides detailed cross-sectional images of the abdominal and pelvic regions, allowing for a clear visualization of the colonic diverticula and any associated complications such as abscess formation, perforation, or peritonitis. The use of oral contrast enhances the delineation of the gastrointestinal tract, improving the accuracy of the evaluation.

CT scans can show not only the diverticula themselves but also the surrounding tissues, helping to identify any inflammatory changes or complications that may arise from diverticulitis. The quick acquisition and high sensitivity of CT imaging make it the standard choice in clinical practice for diagnosing this condition as it can guide appropriate management.

In comparison, other imaging techniques such as X-ray without contrast may not adequately show diverticulitis or its complications. MRI of the abdomen, while useful for certain conditions, is not routinely used for gastrointestinal imaging due to higher costs and limited availability. Ultrasound can detect some complications of diverticulitis but is less reliable than CT for a comprehensive evaluation of the condition.