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2025-07-23 00:12 本頁(yè)面
【正文】 no flow signals can be found in occlusion. 4. Spectral Doppler: Variation Diffuse lesions: the wave form may be monophonic， low speed flow spectrum。 Spectral Doppler： true aneurysm will be seen color flow disorder. False aneurysms False aneurysms, also known as pseudoaneurysms, primarily occur following arterial puncture for catheter access, due to poor control of arterial bleeding following the procedure. False aneurysms 1. Blood flow backward and forward through a hole in the arterial wall into the surrounding tissue, forming a flow cavity in the tissue adjacent to the artery. The false lumen often contains thrombus, False aneurysms can increase in size over time. False aneurysms 2. Color flow images ： The color flow image typically demonstrates a highvelocity jet originating from the defect in the artery wall, which is associated with a swirling pattern inside the false lumen, similar to the ‘yinyang’ sign. False aneurysms 3. Spectral Doppler： Spectral Doppler usually demonstrates an equal forward flow and reverse flow ponent to the arterial jet as flow enters the false aneurysm during systole and exits during diastole. ‘yinyang’ sign Dissecting aneurysms Occur due to a disruption of the intimal lining of the vessel, allowing blood to enter the subintimal space. This can result in the stripping of the intima, and sometimes of the media, from the artery wall. Dissecting aneurysms 1. Bmode images: a false flow lumen is created and the dissected layer of intima and media may be seen flapping freely in time with arterial pulsation. Dissecting aneurysms 2. Color flow images Ture aneurysm False aneurysms Dissecting aneurysms cause atherosclerosis injury, infection atherosclerosis, marfan syndrome Bmode images the artery enlarge arteria cystic mass a ture lumen and a false lumen wall of the aneurysm arterial wall surrounding tissue color flow images disturbance ‘yinyang’ sign color flow in ture lumen and false lumen in different directions Antidiastole Thromboangiitis obliterans, TO 1. Clinical: Often involving the small and mediumsized artery and acpanying vein，
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