CT AND MRI FUSION

CT (roentgen-ray computed tomography) A beam of x-rays is shot straight through the brain. As it comes out the other side, the beam is blunted slightly because it has hit dense living tissues on the way through. Blunting or "attenuation" of the x-ray comes from the density of the tissue encountered along the way. Very dense tissue like bone blocks lots of x-rays; grey matter blocks some and fluid even less. X-ray detectors positioned around the circumference of the scanner collect attenuation readings from multiple angles. A computerized algorithm reconstructs an image of each slice

CT（X射线计算机断层扫描）通过对大脑进行直线X射线照射。当射线穿过大脑的另一侧时，由于途中遇到了致密的活组织，射线略微钝化。X射线的钝化或“衰减”源于沿途遇到的组织的密度。非常致密的骨骼会阻挡大量的X射线；灰质会阻挡一部分，而流体则更少。位于扫描仪圆周处的X射线探测器从多个角度收集衰减读数。计算机算法重建每个切片的图像。