Digital Subtraction Angiography (DSA) is an advanced radiographic technology utilized for diagnosing vascular diseases.
DSA is regularly used to gain images ofarteries in several parts of the body, and is highly efficient in comparing arterial structures with their adjacent soft tissues.
Angiography has the potential to findthe exact reason why blood vessels are blocked.
Digital Subtraction Angiography can be used for both diagnostic and inverventional angiography.
Its high spatial and chronological resolution have maintained it as avery crucial tool.
In conventional angiography, the patient is catheterized, often with the common large artery in thighs.
Wires, clot recovery devices and stents can be conceded to the vessel of interest with this access.
Iodinated difference can be inserted into a catheter and monitored with fluoroscopy, causing the vessel to showup dark relative to the atmosphere.
DSA is a way of fluoroscopy where an opening mask image is taken before administrating contrast and saved.
After administrating contrast, fluoroscopy becomes constant and the saved pre-contrast mask is deducted from the newer images attained after giving contrast.
The output is an image with the backdrop subtracted from the image such that only the contrast increased vessels are seen.
The quick development of equipment for digital subtraction angiography has molded a new diagnostic imaging method, the constraints of which have not been scientifically concluded.
DSA is a portion of the larger phenomenon known as digital radiography.
DSA makes a distinctive contribution to the field of diagnostic radiology.
Digital subtraction angiography systems are likely to limit the use of older non-invasive tests, because of larger sensitivity and precision for diagnostic purposes.
However, the assessment of DSA as a diagnostic technology for revising the carotid artery disease must remind the enhancing development and transmission of ultrasound-based ways for diagnosing extracranial vascular disease.
These technologies have developed quite rapidly and newer ways are likely to appear in the future.
DSA may be used as a substitute or supplement to other invasive tests.
The amount of radiation from DSA is so less that clinical decision-making often does not take radiation into consideration.
The age of digital subtraction angiography has improved the image quality.
Safety as well as clinical efficacy of DSA will depend, to a significant extent, on the quality of particular equipment being utilized, which also affects diagnostic exactness and specificity.
Advanced DSA equipment are equipped with several functions to diminish radiation exposure levels.
DSA can be used for the diagnosis of the hepatic artery to the lower extremities.