Perfusion Analysis - Features

Perfusion analysis allows imaging of grasping blood-flow abnormalities such as brain infarction, stenosis and occlusion of the main artery in their early stages compared to a plain CT image. Particularly, perfusion study is expected to aid in the diagnosis of lesions caused by acute brain infarction promptly. In addition, an effective postoperative follow-up can be done.

Examinations are made by carrying out dynamic scans of specified head sections while applying a bolus injection of an iodized contrast medium. By analyzing the time-density curve of the scanned images, information on the dynamic cerebral blood flow such as Cerebral Blood Flow (CBF), Cerebral Blood Volume (CBV) and Mean Transit Time (MTT) can be acquired.

The perfusion examination with conventional CT was made with a high radiation dose by continuous dynamic scanning. With the improvement of analysis algorithms and the development of the nonlinear noise reduction filter (Adaptive Filter), the CT perfusion scan can be done with a 50-100mA, 1-sec intermittent dynamic scan.

With central axis setting on a cerebral CT image, perfusion analysis function automatically sets the ROIs and calculate the average values of the left/right ROI and the left/right differential. The shape (round or rectangular), number and size of ROIs are also selectable.