When doctors need a detailed look at the small intestine, a routine abdominal scan may not always provide enough information. CT enterography is a specialised CT examination designed to produce detailed images of the small bowel and surrounding structures.
It may be recommended when a doctor is investigating conditions such as small bowel inflammation, Crohn’s disease, bleeding, obstruction, tumours, fistulas or abscesses. Unlike a standard CT, CT enterography uses a specific preparation and imaging protocol to better distend and visualise the small intestine.
What Is CT Enterography?
CT enterography is a specialised form of computed tomography that combines X-ray imaging with contrast material to produce detailed images of the small intestine, abdomen and pelvis.
Before the scan, the patient drinks a specially prepared liquid. This helps expand the small bowel so that its walls and internal structures can be assessed more clearly. Intravenous contrast may also be used depending on the clinical question and the imaging protocol.
The result is a detailed set of cross-sectional images that can be reviewed by a radiologist. CT enterography can show the bowel wall as well as tissues and structures around the intestine.
When Might a Doctor Recommend CT Enterography?
CT enterography is not a routine screening test for everyone. It is usually requested when there is a specific clinical reason to examine the small intestine.
1. Suspected or Known Crohn’s Disease
One of the important uses of CT enterography is the assessment of Crohn’s disease, an inflammatory bowel disease that can affect the small intestine.
Imaging can help doctors assess where inflammation is present, how extensive it is and whether complications such as narrowing, obstruction, fistulas or abscesses have developed.
2. Suspected Small Bowel Inflammation
Persistent abdominal symptoms may sometimes require detailed evaluation of the small bowel. CT enterography can help identify areas of inflammation and changes in the bowel wall.
3. Suspected Small Bowel Obstruction
When doctors suspect a blockage or narrowing of the small intestine, specialised CT imaging can provide information about the location and possible cause.
4. Unexplained Small Bowel Bleeding
In selected patients, CT enterography may help investigate suspected bleeding originating from the small intestine, particularly when other investigations have not identified the cause.
5. Tumours and Other Abnormalities
CT enterography can also help identify certain small bowel tumours and evaluate abnormalities in the surrounding abdominal structures.
What Can CT Enterography Show?
Depending on the reason for the examination, CT enterography may help doctors evaluate:
- Inflammation of the small intestine
- Changes in the bowel wall
- Areas of narrowing or obstruction
- Small bowel bleeding sources in selected cases
- Some small bowel tumours
- Fistulas and abscesses
- Complications associated with Crohn’s disease
- Surrounding abdominal and pelvic structures
The findings are interpreted together with your symptoms, medical history, laboratory results and other investigations. CT enterography is one part of the diagnostic process rather than a standalone diagnosis.
CT Enterography vs a Regular Abdominal CT
Both examinations use CT technology, but the preparation and imaging protocol are different.
| Feature | CT Enterography | Routine Abdominal CT |
|---|---|---|
| Main focus | Detailed assessment of the small intestine | Broader evaluation of abdominal and pelvic structures |
| Preparation | Usually involves drinking a large volume of oral contrast solution | Depends on the examination and clinical indication |
| Imaging protocol | Optimised for small bowel visualisation | Selected according to the clinical question |
| Common clinical use | Inflammation, Crohn’s disease and selected small bowel problems | Abdominal pain, infection, injury and many other conditions |
The appropriate examination depends on what the doctor needs to investigate. A routine CT should not simply be replaced by CT enterography without clinical justification.
How Should You Prepare for CT Enterography?
Preparation can vary between centres and according to the specific protocol. You may be asked to avoid eating or drinking for several hours before the examination.
Because the small bowel needs to be adequately distended, you will usually be asked to drink a prescribed volume of oral contrast or another preparation before imaging. The imaging team will tell you when and how much to drink.
Before the examination, tell your doctor or radiology team if you:
- May be pregnant
- Have kidney disease
- Have diabetes
- Have previously reacted to iodinated contrast
- Have significant allergies
- Are taking regular medicines
- Have recently undergone abdominal surgery or have another significant medical condition
Always follow the preparation instructions provided for your particular examination rather than relying on general advice found online.
What Happens During the Scan?
- You will be given instructions about changing clothes and removing metal objects if necessary.
- You will drink the preparation provided by the imaging team.
- You will lie on the CT table.
- The technologist will position you for the examination.
- Intravenous contrast may be administered if required.
- The table will move through the CT scanner while images are acquired.
- You may be asked to remain still or briefly hold your breath.
The CT imaging itself is generally quick, although the overall appointment can take longer because of preparation and contrast administration.
Does CT Enterography Use Contrast?
CT enterography commonly involves oral contrast to help expand and distinguish the small bowel. Intravenous contrast may also be used to improve assessment of the bowel wall, blood vessels and surrounding tissues.
Before intravenous contrast is given, the imaging team will consider factors such as previous contrast reactions, kidney function and relevant medical conditions. Tell the team about any previous reaction to contrast material.
Is CT Enterography Safe?
CT uses ionising radiation, so doctors recommend it when the expected diagnostic benefit justifies the exposure. Modern CT protocols are designed to optimise radiation dose while obtaining the images needed for diagnosis.
Contrast material can occasionally cause side effects or allergic reactions. Serious reactions are uncommon, but it is important to tell the imaging team about previous reactions, allergies and relevant medical conditions.
If you are pregnant or think you may be pregnant, tell your doctor before the examination so that the most appropriate imaging approach can be considered.
CT Enterography and Crohn’s Disease
For people with suspected or known Crohn’s disease, imaging can provide information that complements clinical assessment and endoscopy. CT enterography can help evaluate the small bowel and identify inflammation or complications that may influence treatment decisions.
Depending on the patient’s age, condition and clinical situation, doctors may also consider MR enterography or other imaging methods. The best test is determined by the treating doctor and radiologist.
CT Enterography in Thrissur
Elite Scan Centre in Koorkanchery, Thrissur provides specialised CT examinations, including CT enterography, using a multislice high-resolution CT system. The centre’s CT services include specialised abdominal imaging and other protocol-based examinations.
If your doctor has recommended CT enterography, contact the centre before your appointment to confirm the preparation instructions, contrast requirements and appointment details.
Learn more about CT imaging services at Elite Scan Centre.
Frequently Asked Questions
Is CT enterography the same as a normal CT scan?
No. Both use CT technology, but CT enterography uses specific preparation and an imaging protocol designed to provide better visualisation of the small intestine.
Is CT enterography painful?
The scan itself is generally painless. Drinking the oral preparation can be uncomfortable for some people because of the volume of liquid, and intravenous contrast may cause a brief warm sensation in some patients.
Can CT enterography detect Crohn’s disease?
CT enterography can help detect and assess Crohn’s disease, including the location and extent of small bowel involvement and certain complications. Diagnosis and treatment decisions require clinical assessment and may involve other tests.
How long does CT enterography take?
The actual CT imaging is usually quick, but the appointment takes longer because you need to drink the oral preparation and may require intravenous contrast.
Can children have CT enterography?
CT may be used in children when clinically necessary, but children are more sensitive to radiation. The treating team will decide whether CT enterography or an alternative such as MR enterography is more appropriate.
Conclusion
CT enterography is a specialised imaging examination that provides detailed views of the small intestine and surrounding structures. It can be particularly useful when doctors are investigating Crohn’s disease, bowel inflammation, obstruction, bleeding or selected small bowel abnormalities.
If you have been advised to undergo CT enterography, follow the preparation instructions given by your doctor or imaging centre and inform the team about your medical history, medications, allergies and any possibility of pregnancy.
This article is for general educational purposes and does not replace medical advice. The need for CT enterography and the most appropriate imaging test should be decided by your treating doctor.
