What Is Digital Subtraction Angiography (DSA)?
If your doctor has recommended an angiography test, you may have come across a term called Digital Subtraction Angiography, or simply DSA. Dr. Nikhila Pachani, Consultant Interventional Cardiologist at Backbone Medicity Hospital, Rajkot, recently explained this important imaging technique in a way that every patient can understand.
How Does DSA Work?
DSA is an advanced medical imaging method used to get a very clear picture of your blood vessels — arteries and veins — inside the body.
Here is how it works, step by step:
- A contrast dye is injected into the bloodstream through a small tube (catheter).
- X-ray images are taken before and after the dye is injected.
- Special computer software then "subtracts" (removes) the background — meaning bones and surrounding tissues are digitally erased from the image.
- What remains is a crisp, clear image of only the blood vessels, making it much easier for the doctor to study them in detail.
Why Is DSA Important?
Because bones and soft tissues no longer appear in the image, doctors can spot problems in blood vessels that might otherwise be hidden. DSA helps identify:
- Blockages in arteries (which can lead to heart attack or stroke)
- Aneurysms — abnormal bulges in a blood vessel wall that can be dangerous if they burst
- Blood clots (thrombus) that may cause embolic strokes
- Haemorrhages (internal bleeding)
- Conditions needing treatments like carotid stenting or other interventional procedures
This makes DSA a valuable tool not just in cardiology, but also in conditions related to the brain and nervous system (cerebrovascular and neurointervention cases).
Is DSA Used in Rajkot?
Yes. Facilities like Backbone Medicity Hospital in Rajkot are equipped to perform DSA, allowing specialists like Dr. Pachani to diagnose and plan treatments accurately and efficiently — right here in Gujarat, without patients needing to travel to larger cities.
Who May Need a DSA?
Your doctor may suggest DSA if you have symptoms or risk factors related to:
- Stroke or mini-stroke (TIA)
- Suspected blockages in neck or brain arteries
- Unexplained neurological symptoms
- Conditions where detailed vessel imaging is needed before a procedure
If you or a family member has been advised to undergo angiography or vascular imaging, speak with a qualified cardiologist or specialist to understand which test is right for your condition and book a consultation.