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The pre-contrast image used to subtract pixel values from the post-contrast image showing contrast-filled blood vessels in digital subtraction angiography is called the :

User Skamazin
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Final answer:

The pre-contrast image used in digital subtraction angiography is called the mask image.

Step-by-step explanation:

The pre-contrast image used to subtract pixel values from the post-contrast image showing contrast-filled blood vessels in digital subtraction angiography is called the mask image.

In digital subtraction angiography, a mask image is obtained before the injection of contrast agent. This initial image acts as a baseline and is then subtracted from the post-contrast image to specifically highlight the contrast-filled blood vessels.

User Sunder
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