See what happens during a CT scan, from lying on the table and getting contrast to the quick scan and what to do afterwards.
A CT scan is quick. You lie on a table, the table moves through a large ring while X-rays take pictures, and you may be asked to hold your breath for a few seconds. Most scans take less than 10 minutes, and the whole visit is about 20 to 40 minutes.
Step 1: Registration and Safety Questions
You hand over your doctor's prescription and old reports. Staff ask about allergies, asthma, diabetes, kidney disease and pregnancy. If contrast is planned, your creatinine report is checked. Read CT scan preparation for the checklist.
StepWhat happensTimeRegistrationForms, prescription and report check5 to 10 minutesPreparationGown, cannula if contrast is needed5 to 10 minutesPositioningLie on the table, staff align you2 to 5 minutesScanTable moves through the ring5 to 10 minutesAfter scanCannula removed, rest if needed5 minutesStep 2: Getting Ready
You may change into a gown and remove metal items. For scans with intravenous contrast, a small cannula is placed in your arm. For some abdominal scans, you drink an oral contrast liquid. See CT scan with contrast.
Step 3: Positioning on the Table
You lie on a narrow padded table. The technologist adjusts your position and may place cushions to keep you comfortable. For a head scan, your head rests in a holder. For a chest scan, you raise your arms above your head. The table then moves into the ring, which is open at both ends and shorter than an MRI tunnel.
Step 4: The Scan
The technologist goes to a control room but can see and hear you. You may be asked to hold your breath for 5 to 15 seconds, so the images stay sharp. The table moves slowly while the scanner rotates. You will hear a soft whirring sound and feel nothing from the X-rays. If contrast is given, you may feel warmth, a metallic taste or a feeling of needing to pass urine for a short time.
Step 5: After the Scan
- The cannula is removed.
- You may be asked to wait for 10 to 15 minutes in case of a rare contrast reaction.
- Drink extra water unless your doctor limits your fluids.
- Return to normal activity.
Read CT scan side effects and contrast reactions.
Special Situations
- Children: a parent may stay nearby, and the scan is set to a low dose. See CT scan for children.
- Pregnancy: tell the staff first. See CT scan during pregnancy.
- Biopsy: the same scanner guides a needle in CT-guided biopsy.
Quick Summary
- Scan time: usually under 10 minutes
- Visit time: 20 to 40 minutes
- No pain from the scan
- Contrast may cause warmth for a minute
- Report usually ready within 24 hours
A practical tip: if you tend to feel anxious, tell the technologist beforehand. They will explain each step and keep talking to you through the intercom. Also read what a CT scan is to know why the test is done.
Do CT Scans Cause Any Feeling Inside the Body?
The X-rays themselves cannot be felt. What you may notice is the contrast: a warm flush through the body, a metallic taste, or a sense of passing urine. These last for about a minute and go away without treatment. Tell the technologist if you feel itching, throat tightness, breathing difficulty or dizziness, because these can be signs of a contrast reaction and need quick help. Staff are trained to handle this, and the room is equipped for it.
Reports and Follow-Up
After the scan, a radiologist reads the images and writes a report. Take the report and the images (CD or digital copy) to the doctor who advised the scan. Do not compare your report with others, because each person's body and problem are different. If the report says "advised clinical correlation", it means the findings should be read together with your symptoms and examination. This is a standard phrase and does not always mean something serious.
Frequently Asked Questions
How long does a CT scan take?
The scan takes under 10 minutes. The visit takes 20 to 40 minutes.
Is the CT scan loud?
It is quieter than MRI. You hear a soft whirring.
Will I be inside a tunnel?
No. The ring is open at both ends and short.
Why do I have to hold my breath?
It keeps the images sharp, because breathing causes movement.
Can I eat after the scan?
Yes, unless your doctor says otherwise.
Is the contrast injection painful?
You feel a needle prick, then warmth for a short time.
Can a family member come inside?
Usually no, because of radiation. In special cases, a protected relative may stay.
Can I go to work afterwards?
Yes, in most cases.
When will I get the report?
Usually within 24 hours.
Book Your Test at Ganesh Diagnostic
Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
