IMAGE CAPTURE, IMAGE ACQUISITION &
DIGITAL SUBTRACTION ANGIOGRAPHY
(DSA) (RAD 285 ADVANCED RADIOGRAPHY)
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
What does DSA stand for? - ANSWER digital subtraction angiography
Digital Subtraction Angiography (DSA) - ANSWER is the procedure to visualize blood vessels with contrast
medium in a bony environment by subtracting the pre-contrast image (the mask)from the image with
contrast medium.
The __________________________ is simply an image of the same area without contrast
administration. - ANSWER mask image
What does IV-DSA stand for? - ANSWER Intravenous digital subtraction angiography
IV-DSA uses a computer technique which compares an x-ray image of a region of the body before and
after _________________based dye has been injected ____________________ into the body. - ANSWER
-radiopaque iodine
-intravenously
(Intravenous digital subtraction angiography)
Tissues and blood vessels on the first image are _____________subtracted from the second image,
leaving a clear picture of the artery which can then be studied independently and in isolation from the
rest of the body. - ANSWER digitally
The purpose of subtraction of angiographic images is to..... - ANSWER demonstrate the vessels free of
superimposed, disturbing image noise.
, The subtraction technique is based on ...... - ANSWER the assumption that during exposure, tissues do
not change in position or density. As can be observed from the latter images, this is not always the case.
In practice, patient motion frequently occurs, which causes the subtraction images to show
_____________________that may hamper proper diagnosis. - ANSWER artifacts
In clinical practice, Digital Subtraction Angiography (DSA) is a powerful technique for the visualization of
_____________________ in the human body.
With this technique, a sequence of X-ray projection images is taken to show the passage of a
__________________of injected contrast material through one or more vessels of interest. - ANSWER -
blood vessels
-bolus
an image taken prior to injection is called - ANSWER the mask image
an image containing contrasted vessels is called - ANSWER the live or contrast image
Pixel Shift (PS) - ANSWER Registering the image to correct for patient motion (artifacts)
DICOM - ANSWER Digital Imaging and Communications in Medicine
Several methods are available for forming digital images: - ANSWER -direct (flat-panel digital detectors)
-indirect
Direct flat panel detector - ANSWER *HIGH patient dose*
No light production, but better resolution
DIRECT= uses *amorphous selenium* accepts the x-ray photons and transform them into a charged
electronic signal. The charge is stored until digitally read.
Indirect flat panel detector - ANSWER Light production
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