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In digital subtraction angiography (DSA), an image is obtained prior to the introduction of the radio-opaque contrast medium. This image is then digitally "subtracted" by turning it into a "negative" and then superimposing the image onto images acquired after the injection of contrast. This theoretically results in everything but the image of contrast within the vessel being subtracted, or removed, leaving a clearer picture. Often due to patient movement, breathing etc, the two images do not exactly superimpose and some residual shadow of the surrounding structures may be visible.
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What does the word difference mean in math?
"Difference" means subtraction. for example the "difference" between 9 and 2 is 7.
What do you call the answer to a subtraction prolbem?
The answer to a subtraction problem is called the difference. It is called this, because when you are subtracting you are finding the difference between one number and another.
What is the difference in math terms?
Difference is a subtraction word. What is the difference between 5 and 2 = 3
What is the difference between -1 and 4?
Difference = Subtraction (-1) - (4) = -5
What Is The difference between 5C and 18C?
13C or -13C depending on the order of subtraction
