Computed tomography, commonly known as a CT scan, has become one of the most valuable diagnostic tools in veterinary medicine. While X-rays provide a flat, two-dimensional image, CT scans create detailed cross-sectional pictures of your cat's body, allowing veterinarians to see structures that would otherwise be hidden.
CT scanning was originally developed for human medicine in the early 1970s by Sir Godfrey Hounsfield. By the late 1980s and early 1990s, veterinary teaching hospitals began acquiring their own CT units, mostly retired from human hospitals that had upgraded to newer models. The University of Pennsylvania and Colorado State University were among the early adopters. Through the 1990s, CT became increasingly available at specialty veterinary practices. Today, many emergency animal hospitals have CT capability, though the cost of a scan can range from $1,000 to $3,000 depending on your location.
Your veterinarian might recommend a CT scan when standard X-rays and ultrasound do not provide enough detail. Common reasons include evaluating nasal tumors and chronic nasal discharge, staging cancer to see if it has spread, examining complex fractures of the skull or spine, investigating chronic ear infections that may involve the middle or inner ear, and planning surgical approaches for difficult tumors. CT is particularly useful for imaging the head, nasal passages, and bony structures where ultrasound performs poorly.
Your cat will need general anesthesia for the scan, since the patient must remain completely still. The procedure itself is quick, usually taking only five to fifteen minutes of actual scan time. Most cats recover from the anesthesia within a few hours. The images are typically reviewed by a board-certified veterinary radiologist, and results are usually available within one to two business days. Some facilities offer same-day readings for urgent cases.