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Other more invasive means can also be used. A [[cannula]] or [[catheter]] inserted into an artery may be used to measure [[pulse pressure]] or [[pulmonary wedge pressure]]s. Angiography, which involves injecting a dye into an artery to visualise an arterial tree, can be used in the heart ([[coronary angiography]]) or brain. At the same time as the arteries are visualised, blockages or narrowings may be fixed through the insertion of [[stent]]s, and active bleeds may be managed by the insertion of coils. An MRI may be used to image arteries, called an [[magnetic resonance angiography|MRI angiogram]]. For evaluation of the blood supply to the lungs a [[CT pulmonary angiogram]] may be used. [[Doppler ultrasonography#Blood vessels|Vascular ultrasonography]] may be used to investigate [[vascular disease]]s affecting the [[venous system]] and the [[arterial system]] including the diagnosis of [[stenosis]], [[Ultrasonography of deep venous thrombosis|thrombosis]] or [[Ultrasonography of chronic venous insufficiency of the legs|venous insufficiency]]. An [[intravascular ultrasound]] using a [[catheter]] is also an option.

Translations:Circulatory system/39/en - Revision history

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