angiography

[an″je-og´rah-fe]

radiography of vessels of the body after injection of contrast material; see also arteriography, lymphangiography, and phlebography. Called also vasography.

digital subtraction angiography radiographic visualization of blood vessels, with images produced by subtracting background structures and enhancing the contrast of those areas that change in density between a preliminary “mask” image and subsequent images.

dig·i·tal sub·trac·tion an·gi·og·ra·phy (DSA),

computer-assisted radiographic angiography that permits visualization of vascular structures without superimposed bone and soft tissue densities; subtraction of images made before and after contrast injection removes structures not enhanced by the contrast medium. Other image processing can be performed. Contrast material may be injected intravenously or in a lower-than-usual amount intraarterially.

Farlex Partner Medical Dictionary © Farlex 2012

digital subtraction angiography

Radiology A diagnostic technique that uses video equipment and computers to enhance images obtained with conventional angiography

dig·i·tal sub·trac·tion an·gi·og·ra·phy

(DSA) (dij'i-tăl sŭb-trak'shŭn an'jē-og'ră-fē)

Computer-assisted radiographic angiography permitting visualization of vascular structures without superimposed bone and soft tissue density; images made before and after contrast injection allow subtraction (separation and removal) of opacities not enhanced by the contrast medium Other image-processing can be performed. Contrast material may be injected intravenously or in lower-than-usual amounts intraarterially.
See: digital radiography

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

digital subtraction angiography

A method of imaging blood vessels that eliminates unwanted detail. Two digitized images are made, before and after injecting a radio-opaque dye. A negative image of one is then combined with the other, so that only differences between the two show up-in this case the dye in the vessels.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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References in periodicals archive

Caption: FIGURE 3: Digital subtraction angiography showing severe long segment stenosis of right-side iliofemoral arteries.

A Case of Polyarteritis Nodosa Presenting as Rapidly Progressing Intermittent Claudication of Right Leg

(8.) Paul J Nederkoorn, Yolanda Vander Graff, Myriam Hunink MG: Duplex ultrasound and magnetic resonance angiography compared with digital subtraction angiography in carotid artery stenosis: A Systematic Review: Stroke 2003;34:1324-1332.

Comparative study of extracranial carotid and vertebral artery doppler with contrast enhanced MR Angiography in patients with stroke

Flak et al., "Multidetector CT angiography of the aortoiliac system and lower extremities: a prospective comparison with digital subtraction angiography," American Journal of Roentgenology, vol.

The role of imaging in patient selection, preoperative planning, and postoperative monitoring in human upper extremity allotransplantation

While digital subtraction angiography (DSA) is still viewed as the gold standard in carotid imaging, noninvasive imaging methods, including resonance angiography (MRA), computed tomography angiography (CTA), and ultrasonography, play an increasing role in the evaluation of carotid artery disease.

Carotid artery stenosis: comparison of 3D time-of-flight MR angiography and contrast-enhanced MR angiography at 3T

CT angiography with Digital subtraction angiography is the gold standard in the diagnosis but venous colour Doppler ultrasound study is also useful for the diagnosis of venous aneurysm.

External jugular vein aneurysm with thrombus presenting as painful neck mass: a case report

Computed tomography angiography (CTA) and digital subtraction angiography (DSA) showed a total obstruction in the right MCA with moyamoya phenomenon at distal trunks and a protruding lesion in the left MCA bifurcation.

Occluded middle cerebral artery vascular stump mimicking aneurysm: Case report and review of literature

Although its invasive nature and requirement for ionizing radiation significantly limit its role, digital subtraction angiography (DSA) is regarded as the gold standard technique in the evaluation of vascular structures.

Normal anatomical features and variations of the vertebrobasilar circulation and its branches: an analysis with 64-detector row CT and 3T MR angiographies

Digital Subtraction Angiography (DSA) was irst introduced in 1980 as a direct method of vessel caliber assessment.

Advanced imaging modalities in the detection of cerebral vasospasm

Physicians can now create a digital subtraction angiography at any time without having to use the touchscreen interface.

Unlimited imaging for vascular specialists with Ziehm Imaging

The unit is coupled to a Vital diagnostic workstation which allows for 3D imaging and digital subtraction angiography. This technology has been absent in the health sector up until now.

Life saving technology at state hospitals

Conventional digital subtraction angiography (DSA), although diagnostic in its demonstration of the vascular anomalies, has largely been replaced by CTA and MRA.

Paediatric vascular imaging: diagnosis

Conventional angiography and digital subtraction angiography failed to pick multiple vessels in 31% of the grafts1.

Results of Separate Anastomoses of Multiple Renal Arteries with Recipient External Iliac Artery in Renal Transplant Surgery