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digital subtraction angiography (DSA)
Angiobraphy with images produced by subtracting a pre-contrast image from images after contrast is introduced.
Indications:
- visualization of arterial & venous occlusions, including
a) carotid artery stenosis
b) pulmonary embolism
c) acute limb ischemia
d) renal artery stenosis
- visualizing cerebral aneurysms & arteriovenous malformations (AVM)
Clinical significance:
- images obtained from standard angiography include all overlying structure besides the blood vessels
- this is useful for determining anatomical position & but interferes with visualizing blood vessels
- digital subtraction angiography subtracts background noise from the fluoroscopic images of the blood vessels
General
angiography
References
- Wikipedia: Digital subtraction angiography
http://en.wikipedia.org/wiki/Digital_subtraction_angiography
- Digital Subtraction Angiography (DSA)
NHS Foundation
http://www.dbh.nhs.uk/our_services/medical_imaging/digital_subtraction_angiography.asp
- DSA means Digital Subtraction Angiography
http://www.droid.cuhk.edu.hk/web/service/angio/dsa.htm