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| Angiography |
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| Angiography involves injecting a dye directly into the blood and then taking X-rays of the arteries. Angiography of the blood vessels of the heart is called Coronary angiography. |
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| X-rays when coupled with image intensifiers gives a more real image. During surgery, these images can be viewed by CRT (cathode ray tube) video monitor. |
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| Digital Subtraction Angiography (DSA) |
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| Digital Subtraction Angiography (DSA) is an imaging technique that produces clear views of flowing blood in vessels and shows the presence of blockages, if any. First an angiograph is taken of the organ and stored in a computer. A second angiograph is taken after a contrast agent containing iodine, which is opaque to X-rays is injected into the blood stream. The first image is digitally subtracted from the second image and a clear outline of blood flow to that organ emerges. DSA is a technique whereby images obtained before contrast injection are digitised and subtracted from post - contract images, thus removing bones and other background structures from the final digital images. This technique is more sensitive and obtains high-quality images. |
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