1. Enhanced or Unenhanced: That is the question… DMI 57

2. Why enhance? Increase attenuation coefficient Differentiate tissue densities Observe infusion of vascularity, tumors, or other structures Timing becomes important Commonly used contrast agents –IV – Iodinated –Oral – Barium or Iodinated, sometimes H 2 O –Intrathecal – Iodinated –Air – Negative contrast

3. Differing Tissue Densities in the Neck DMI 57

4. The Grocery List List the structures you would expect to see in the neck Now, divide them into categories: –Air filled structures –Tissue structures –Vascular structures

5. On this next slide, let’s look at the difference between arteries and veins

6. Vein Artery

7. Now, let’s look at some air-filled structures

11. Let’s look at some soft tissue structures