CT angiography of the leg arteries shows blockages that cause leg pain on walking or non-healing wounds. Learn who needs it and how it helps plan treatment.
CT angiography of the leg arteries uses contrast and a fast CT scan to show narrowing or blockage in the arteries from the belly down to the feet. It is used for peripheral arterial disease, which causes leg pain on walking, cold feet, and wounds that do not heal, especially in people with diabetes, smokers and older adults.
What Is Peripheral Arterial Disease?
Peripheral arterial disease (PAD) happens when fatty plaque narrows the arteries to the legs. It often goes with heart and brain artery disease, so it is a sign of general vascular risk. Diabetes, smoking, high blood pressure and high cholesterol are the main causes. Doctors first check pulses and the ankle-brachial index. See CT angiography of the aorta for a related scan.
SymptomWhat it may meanCalf pain on walking that eases with restClaudication from narrowed leg arteriesCold, pale or blue footReduced blood flowNon-healing ulcer or black toeSevere disease (critical limb ischaemia)Sudden painful, pale legBlocked artery; emergencyWeak pulses in the footPossible arterial diseaseWhen Is CT Angiography Needed?
- Leg pain on walking not explained by joints or nerves
- Foot ulcers or gangrene in diabetes
- Planning angioplasty, stenting or bypass
- Sudden leg ischaemia
- Checking a bypass graft or stent
How the Scan Works
Contrast is injected through a vein and the scanner follows it down the legs. The scan takes seconds and the visit under an hour. It maps blockages in 3D, including calcium, which helps the vascular surgeon plan. Fasting for 4 to 6 hours is advised, and a creatinine test is needed. See CT scan with contrast.
Challenges in Diabetic and Kidney Patients
Heavy calcium in leg arteries can hide the opening of the artery. Kidney disease raises the risk of contrast injury. In such cases, doctors may choose Doppler ultrasound, MR angiography or direct catheter angiography with a lower contrast dose. See CT angiography vs MR angiography and kidney function and contrast.
A Practical Example
Ismail, 60, a diabetic smoker, has a toe ulcer that does not heal in two months. A CT angiography shows long blockages in the arteries below the knee. His vascular surgeon performs an angioplasty, and the wound heals over weeks. Early imaging helped save his foot.
Key Facts at a Glance
- CT angiography shows blockages from belly to foot
- It guides angioplasty, stenting or bypass
- Stop smoking and control sugar to protect your legs
- Check kidney function before contrast
After the Scan and Next Steps
Take the report to a vascular surgeon or cardiologist. Treatment includes medicines to thin the blood and lower cholesterol, a supervised walking programme, strict foot care and, when needed, angioplasty or bypass surgery. Stop all tobacco, control diabetes and blood pressure, wear well-fitting shoes and check your feet daily for sores.
Questions to Ask Your Doctor
- How severe are my blockages and where are they?
- Do I need angioplasty or bypass?
- How can I protect my feet if I have diabetes?
- Is my kidney function safe for contrast?
Common Mistakes to Avoid
- Ignoring a small foot wound.
- Walking barefoot.
- Continuing to smoke.
Booking, Timing and Report
Book a morning slot if possible, since fasting is easier. Carry your doctor's prescription, previous heart and blood reports, a recent creatinine report and a medicine list. Allow 45 to 90 minutes at the centre. Reports are usually ready within 24 to 48 hours, because vessel images need careful review.
Foot Care Every Day
Wash and dry your feet daily, check between the toes for sores or colour changes, use moisturiser but not between the toes, and cut nails straight. Never walk barefoot, and avoid hot water bottles or heating pads on numb feet. Report any blister, cut or colour change immediately, since poor circulation slows healing.
Frequently Asked Questions
What is peripheral arterial disease?
Narrowing of the arteries that supply the legs.
Is CT angiography better than Doppler?
CT gives a full map; Doppler is quick and has no contrast.
Do I need fasting?
Yes, 4 to 6 hours.
Is contrast safe for diabetics?
Yes with kidney checks.
Can I walk after the scan?
Yes.
Can calcium affect the scan?
Yes, heavy calcium can blur parts.
Do all blockages need surgery?
No. Many are treated with medicines and exercise.
How long does it take?
The scan takes seconds; the visit under an hour.
When is the report ready?
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. Reports can be downloaded online through our patient portal, so you do not need to make a second trip just to collect them.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
