What are the drawbacks of digital subtraction angiography?

Disadvantages of DSA: (1) limited spatial resolution, (2) artefacts, (3) small visual field. Main indications of DSA: (1) diagnosis and follow up study of vascular diseases, (2) evaluation of patency of by-pass graft, (3) functional assessment (of cardiac output and blood flow etc.).

Is digital subtraction angiography safe?

Conclusion: Carbon dioxide digital subtraction angiography is a versatile technique that can be safely used for diagnostic and therapeutic endovascular procedures. Morbidity and mortality are acceptable with preservation of renal function. Thus, CO2-DSA is a safe alternative to iodinated contrast.

What causes Misregistration during digital subtraction angiography?

As a major problem in DSA, misregistration occurs when the mask and angiographic images do not exactly coincide [1, 2]. It is caused not only by voluntary movement of the patient but also by involuntary movements such as bowel peristalsis or cardiac pulsation.

What is digital subtraction angiography not used for?

Intravenous digital subtraction angiography Some limited studies have indicated that IV-DSA is not suitable for patients with diabetes or kidney failure because the dye load is significantly higher than that used in arteriography.

When is digital subtraction angiography used?

Digital subtraction angiography is used to produce images of the blood vessels without interfering shadows from overlapping tissues. This provides a clear view of the vessels and allows for a lower dose of contrast medium 4.

What is subtraction in radiography?

Subtraction radiography offers greater visualization of radiographic changes between a pair of radiographs by subtracting out the unchanging background distractions. Originally, subtraction was achieved by using positive and negative prints in angiography.

What is the difference between angiography and venography?

One of the most common reasons for Angiograms is to see if there is a blockage or narrowing in a blood vessel that may interfere with the normal flow of blood through the body. Venography uses an injection of contrast material to show how blood flows through the veins.

How long does a digital subtraction angiography take?

How long will it take? This depends on the test you are having done. It could be anything between 30 minutes and 3 hours. The DSA staff will be able to tell you in more detail as the test progresses.

What is the function of digital subtraction angiography?

Provides an image of the blood vessels in the brain to detect a problem with blood flow. The procedure involves inserting a catheter (a small, thin tube) into an artery in the leg and passing it up to the blood vessels in the brain.

What is the basic principle of DSA?

The basic principle of DSA is to acquire a static image in the initial stage of the examination and subtract it to the subsequent flow of dynamic images. This examination technique is adequate for static imaging. However, traditional detectors struggle to properly remove the background during dynamic imaging.

What is the purpose of subtraction radiography?

How does digital subtraction angiography work?