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How to calculate arteriovenous circulation time in cerebral angiography

Cerebral angiography is an interventional examination used to evaluate cerebrovascular diseases, including arterial stenosis, aneurysm and arterial thrombosis. In cerebral angiography, arteriovenous circulation time refers to the time interval between the entry and exit of blood flow between arteries and veins.

The calculation of arteriovenous circulation time can be realized by observing the movement of contrast agent in vascular system. The specific steps are as follows:

1. Inject contrast agent into the patient: After injecting contrast agent, observe the diffusion of contrast agent in the vascular system through continuous X-ray photography or computed tomography (ct).

2. Observe the perfusion and emptying of blood vessels: Observe the time when arteries and veins are filled with contrast agent and the time when contrast agent is emptied by continuous shooting or scanning.

3. Calculate the circulation time of artery and vein: the circulation time of artery refers to the time when artery is filled with contrast agent, and the circulation time of vein refers to the time when contrast agent drains from artery to vein. By observing the continuous angiographic images, these two time points can be accurately measured, so as to calculate the circulation time of the outflow vein.

It should be noted that there may be some errors in the calculation of arteriovenous circulation time in practical application, because the vascular system structure and contrast agent propagation speed of each patient may be different. Therefore, in clinical application, it is necessary to combine clinical symptoms and other imaging examination results for comprehensive judgment. If you have specific symptoms, it is recommended to consult a professional doctor to get an accurate answer.