CT Head/Brain without contrast Diagnostic Imaging

A head CT without contrast is an imaging test that uses X-rays and a computer to create detailed pictures of the brain and skull.

CT Head/Brain without contrast procedure illustration

Overview

A head CT without contrast is an imaging test that uses X-rays and a computer to create detailed pictures of the brain and skull. It is quick and painless. "Without contrast" means no iodine dye is injected. Clinicians use this test to look for problems such as bleeding, skull fractures, some types of stroke, and other urgent issues in the head. It is commonly used in emergency settings and can help guide next steps in care.

Overview Preparation Clinical Info Recovery FAQ References

Also known as: Non-contrast head CT, CT brain without contrast, NCCT head

Recovery
Same day
Return to Work
Same day

Preparation & Next Steps

Everything you need to know before and after your procedure

Before Care

  • Bring a photo ID and any prior head imaging reports or image CDs if available
  • Inform the imaging staff if you are or could be pregnant
  • Remove hairpins, wigs, jewelry, hearing aids, or dental appliances that can affect images
  • Wear comfortable clothing without metal near the head and neck area
  • Fasting is usually not required for a non-contrast head CT unless the facility instructs otherwise
  • Tell the staff if you have trouble lying flat or feel claustrophobic so they can plan support
  • Arrive a bit early to complete check-in and confirm how and when you will receive results
  • Verify any needed insurance authorization with your ordering clinician or the imaging center
  • Bring a current list of medicines and allergies, even though no contrast dye is planned

After Care

  • You can usually return to normal activities and eating right after the scan
  • Ask when and how results will be shared, such as through a patient portal or phone call
  • Keep a copy of the report and images if the facility offers a CD or online access
  • Follow any instructions from the imaging center if you received a calming medicine
  • Note any changes in your symptoms to discuss with the clinician who ordered the test
  • Schedule recommended follow-up appointments or additional imaging if advised
  • Contact a clinician if you develop new or worsening severe headache, confusion, weakness, slurred speech, or vision loss
  • Store your imaging records so future clinicians can compare studies

Clinical Information

Important medical details about this procedure

Indications

  • Head injury or suspected skull fracture
  • Sudden severe headache
  • Stroke symptoms such as weakness, trouble speaking, or vision changes
  • Confusion or altered mental status
  • Seizure evaluation
  • Suspected brain bleeding
  • New or worsening neurologic symptoms
  • Monitoring known conditions that need a quick check for complications

Alternatives

  • MRI of the brain for certain tumors, infections, or subtle strokes
  • CT head with contrast when looking for tumors, infections, or blood vessel problems
  • Observation and neurologic exams when appropriate
  • Ultrasound in infants with an open soft spot
  • Follow-up clinical evaluation and watchful waiting in selected cases

Risks

  • Exposure to ionizing radiation
  • Incidental findings that may lead to more tests
  • Small chance of missing very early or subtle problems
  • Need for additional imaging if results are unclear
  • Discomfort from lying still or feeling confined
  • Special consideration during pregnancy due to radiation

Contraindications

  • Pregnancy is a relative concern; scanning may proceed if benefits outweigh risks
  • Inability to lie still without support or sedation
  • Body size or weight beyond the scanner's limits

Recovery Timeline

What to expect during your recovery

There is no medical recovery period for a non-contrast head CT. Most people resume normal activities immediately after the scan.

Typical Range

Same day

Return to Work

Same day

Recovery Milestones

Day 0

Resume normal daily activities and eating

Day 0–2

Receive or review the radiology report through the portal or with your clinician

Day 1–14

Complete any ordered follow-up imaging or appointments

Frequently Asked Questions

Common questions and expert answers about this procedure

What is a head CT without contrast?

It is a quick X-ray based scan of your head that creates detailed cross-sectional images without using iodine dye.

How long does the scan take?

The scan itself usually takes a few minutes. Total time at the facility is often 15 to 30 minutes, including setup.

Does it use radiation?

Yes. A CT uses more radiation than a standard X-ray. Facilities use the lowest dose needed to answer the clinical question.

Will it show a stroke or bleeding?

It is very good at finding bleeding and can show some strokes. Very early ischemic strokes may not be visible right away.

Why is no contrast dye used?

For urgent concerns like bleeding or head injury, dye is not needed. Contrast may be used for other questions such as tumors or infections.

Can I have a head CT if I am pregnant?

Imaging is considered carefully in pregnancy. CT may be done if the expected benefit outweighs the radiation risk.

Do I need to remove jewelry or hair accessories?

Yes. Metal near your head, like hairpins or earrings, can degrade images and should be removed.

When will I get my results?

A radiologist reads the images and sends a report to your ordering clinician. Timing varies by facility and urgency.