Anatomy Yr-1

introduction spinelimbs
m2 thorax abdpelvis headneck
followup

Explanations and cases for review AFTER class

case5 case2 case3 case4

CT (computed tomography) displays different types of tissues in the body on a scale of shades of gray, from pure black (air) to pure white (metal). This image shows some of the different tissues that CT can discriminate, both on the CT image and on the scale of density at the top.

case1image71
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water
fat
tissue
bone
lung

Note that the density of muscle and blood is about the same--they are similar shades of gray on CT unless you inject something into the blood to make it denser (contrast material). No contrast material was given to this patient.

CT has several advantages over x-rays, including removing overlap of structures and better ability to discriminate tissues of different densities. The main disadvantage is much higher radiation dose than x-rays.

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spinelimbs case5