Table of Contents
What is a digital subtraction angiography study?
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.
When is subtraction angiography used?
A technique called digital subtraction angiography (DSA) is particularly useful in diagnosing arterial occlusion (blockage). For example, it can be used to identify constriction (stenosis) of the carotid artery or clot formation (thrombosis) in a pulmonary artery. It also can be used to detect renal vascular disease.
What is subtraction in radiography?
Subtraction is a simple photo-radiographic procedure which intensifies any difference between two radio- graphs of the same part of the body by subduing the background details.
What contrast is used in DSA?
Most contrast agents used in digital subtraction angiography (DSA) are non-ionic iodinated contrast agents, which can cause severe side effects in patients with contraindications for iodine or allergic reactions to iodine.
What is a digital subtraction Myelogram?
Digital subtraction myelography (DSM) is a valuable diagnostic technique to detect the exact location of CSF leaks in the spine to facilitate definitive treatment with surgery or targeted blood patch.
What is hybrid subtraction?
Hybrid subtraction uses dual-energy scanned projection radiography to provide pre- and post-contrast images with the soft tissues subtracted. These pre- and post-contrast soft-tissue-cancelled images are then subtracted.
When was digital subtraction angiography invented?
Subtraction angiography was first described in 1935 and in English sources in 1962 as a manual technique. Digital technology made DSA practical starting in the 1970s….
| Digital subtraction angiography | |
|---|---|
| Example of iodine-based contrast in cerebral angiography | |
| MeSH | D015901 |
Who invented DSA?
DSA was actually invented at UW by a group of medical physicists headed by Charles A. Mistretta, PhD, and UW owns the patent to DSA.
What is myelogram used for?
A myelogram is a diagnostic imaging test generally done by a radiologist. It uses a contrast dye and X-rays or computed tomography (CT) to look for problems in the spinal canal. Problems can develop in the spinal cord, nerve roots, and other tissues.
What is a DSM procedure?
What is temporal subtraction?
Temporal subtraction is an image processing technique that facilitates the visualization of pathologic change across serial chest radiographic images acquired from the same patient; dual-energy imaging exploits the differential relative attenuation of x-ray photons exhibited by soft-tissue and bony structures at …
What is a digital subtraction myelogram?
What is the difference between a MRI and a myelogram?
Compared to an MRI, a myelogram, and the post myelogram CT scan, is able to show the bony details in a better way, but is less capable of showing the soft tissue details in your spine.
Who performs a myelogram?
A myelogram is a diagnostic imaging test generally done by a radiologist. It uses a contrast dye and X-rays or computed tomography (CT) to look for problems in the spinal canal. Problems can develop in the spinal cord, nerve roots, and other tissues. This test is also called myelography.