This document discusses various imaging modalities used to image the abdomen and pelvis, including ultrasound, CT, MRI, fluoroscopy, and nuclear medicine scans. It provides details on how each modality works and examples of images produced. Key anatomy seen on plain films is described. The primary modalities are said to be ultrasound, CT and plain films. Choice of modality depends on clinical presentation and physical exam findings. Understanding anatomy aids in interpreting imaging studies.