We can discriminate much finer variations in density of tissue and as it turns outman other organs in our body have signatures subtly different density different electron density just because their composition the liver for example which has tremendous amount apply kitchen is I'd denser than is the spleen are the kiddies the white matter in the brain because up the lipids in the Milan is less dense than is the gray matter because it is more cellular and this enables a CT enables us to discriminate much finer gradations here's an example of a cross-section of an abdominal CT a hearing in this case this patient has received an intravenous contrast agent and we see the blood vessels within the liver highlighting these are the kidneys and the spring here is the example love what CT using the same X-rays gets over projection radiography we go from this view this call to being able to see into the school to being able to see the differentiation between gray and Diabacor white matter the dark area is the fluid within the cerebral ventricles the CSF as well as the dark here in the subarachnoid space in here is an example of a patient whose just suffer from an acute stroke in this particular case we see this dark area here with in the hemisphere the brain cerebral hemisphere and this is here school CT scanning.
The early detection stroke in management patients prior to using CT scan prior to Godfrey Hounsfield development in 1974 this technology which earned him the Nobel Prize as well this was all we could get and so it has-been tremendously enabling there are many important uses for CT and in general I just to list a few of them CT is at the center cancer detection and staging it is at the center at the assessment at patience I who are suffering from trauma whether its motor vehicle access weathers penetrating trauma from gunshots knives other projectiles a basically anyone who has an accident serious accident is going to get CT abdominal emergencies whether it's I embowel obstructions a all kinds of infections that can occur many complications in the Admin the detection of stroke and vascular imaging really has a very central role in many aspects medicine another important advantage to CT is that it offers this high volume metric resolution and when you think about it you if you do a CT scan in about 10seconds you can peel off hundreds up transfer sections and it is incredibly inefficient to put them up in this fashion you notice that I don't show you anything like this but if you watch the TV shows they still do that with the film you know there's a little squares and such that's what that is and that’s not how we look at CT scans.
