CT Airways & Lungs - Video Lesson

Hey everybody, welcome back. This lesson is about the airways and lungs as seen in CT imaging. We'll start with a coronal image. This is a coronal reformation of the chest. The image has been processed with the lung algorithm to increase spatial resolution and demonstrate the finer details of the airways and lungs. Notice that the windowing technique is very different from what we've seen before. The window width is very large, about eighteen hundred. Not as large as the bone window width, but still much larger than usual. The lung tissues are naturally extremely high in contrast, so high that we must use a wide window width to decrease the visible contrast. Notice that the window level is a negative number, usually about negative six hundred. Negative six hundred corresponds to the average Hounsfield value of the lung tissue. The window level is always set to match the Hounsfield value of the tissues we are most interested in seeing. This coronal image is