Sputum is thick fluid coughed up from the lungs or breathing tubes.
The spiral CT scan is a painless procedure in which a special imaging machine rotates rapidly around the body taking over one hundred pictures in sequence. The scan is so sensitive that it is possible to detect nodules that are too small to be seen on a conventional chest x-ray. Spiral CT scan sites. The MRI scan is similar to CT scan but uses magnetic waves to create 3-D images of the body. It uses water content of various tissues to create contrast to differentiate and identify them.