Final answer:
The radiologic examinations that require preparation consisting of a low-residue diet, cathartics, and enemas are barium studies and colonography. Barium studies involve the ingestion of a suspension of barium sulfate, which coats the intestinal tract and provides greater visual detail for X-ray imaging. Colonography is a non-invasive procedure that uses a CT scan to produce images of the colon, requiring patients to follow a specific preparation process to obtain clear images.
Step-by-step explanation:
The radiologic examinations that require preparation consisting of a low-residue diet, cathartics, and enemas are barium studies and colonography.
Barium studies involve the ingestion of a suspension of barium sulfate, which coats the intestinal tract and provides greater visual detail for X-ray imaging. This type of examination can be used to diagnose conditions such as acid reflux disease, Crohn's disease, and ulcers.
Colonography, also known as virtual colonoscopy, is a non-invasive procedure that uses a CT scan to produce images of the colon. To obtain clear images, the colon needs to be empty. Therefore, patients are required to follow a low-residue diet, take cathartics to cleanse the bowel, and undergo enemas prior to the examination.