Digital Subtraction Angiography
Catheter-based iodinated contrast angiography for vessels.
What is Digital?
Digital Subtraction Angiography is an invasive imaging technique where a catheter is inserted into an artery or vein and contrast dye is injected while X-ray images are captured. Digital subtraction removes bone and soft tissue, leaving only clear vascular images.
How it works: A catheter is guided to the target vessel under fluoroscopy. Contrast material is injected while X-ray images are rapidly acquired. A computer algorithm subtracts pre-contrast images from post-contrast images, eliminating background structures to reveal vessels clearly.
Common Uses of Digital
Cerebrovascular assessment
Evaluate for cerebral aneurysms, arteriovenous malformations, and carotid stenosis
Peripheral arterial disease
Assess aortoiliac, femoral, and tibial arteries for stenosis and occlusion
Renovascular hypertension
Identify renal artery stenosis as a cause of secondary hypertension
Tumor vascularity assessment
Evaluate tumor blood supply before embolization or surgery
Transcatheter interventions
Perform angioplasty, stenting, embolization, thrombolysis, and thrombectomy
Advantages
- ✓Highest resolution vascular imaging available
- ✓Allows simultaneous diagnosis and treatment
- ✓Real-time fluoroscopic guidance during procedures
- ✓Can measure pressure gradients across stenoses
- ✓Gold standard for vascular interventions
Limitations
- ⚠Invasive nature with potential complications (bleeding, infection, dissection)
- ⚠Radiation exposure during prolonged procedures
- ⚠Contrast nephropathy risk in patients with kidney disease
- ⚠Limited availability outside specialized centers
- ⚠Requires experienced interventional radiologists
Preparation Checklist
0 of 13 completed
⚖️Digital vs CT
Related Imaging Modalities
Correlate with CT angiography/MRA for non-invasive alternatives. Ultrasound provides accessible screening for accessible vessels.
CT
CT scans use X-rays to create detailed cross-sectional images of the body. They are particularly useful for detecting bone fractures, tumors, and internal bleeding.
MRI
MRI uses powerful magnets and radio waves to produce detailed images of organs and soft tissues. Excellent for brain, spine, and joint imaging.
Ultrasound
Ultrasound uses sound waves to create real-time images. Commonly used for pregnancy monitoring and examining organs like the heart, liver, and kidneys.
Browse Digital Terms
Explore common terms in Digital reports, each with detailed explanations, clinical significance, and related lab tests to help you understand your imaging results. lab tests.
Arterial Stenosis DSA: What It Shows, Cost & Preparation
Focal arterial narrowing with or without post-stenotic dilation or collateral formation
Arteriovenous Malformation DSA: What It Shows, Cost & Prepar
Tangle of abnormal arteries and veins with early venous shunting, no normal capillary bed
Cerebral Aneurysm DSA: What It Shows, Cost & Preparation
Focal arterial dilation or outpouching, often at vessel bifurcations
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