Lateral Tib-Fib

Lateral Tib-Fib. By using the Technique by Proportional Anatomy table, we know that a lateral Tib-Fib is halfway between an AP Ankle and AP Knee. The table also tells us that an AP Ankle is equal to a Lateral Foot. 

As mentioned previously, we know that our technique for AP Knee is 66kVp and 5mAs because of our findings from an experiment from a previous week. We also know that our technique for Lateral Foot is 66kVp and 1.6mAs, which we found earlier in this experiment. Since Lateral Foot is equal to an AP Ankle, we will be using 1.6mAs as reference. 

Now that we know that our mAs for AP Ankle is 1.6 and our mAs for AP Knee is 5, we then calculated to find our mAs that is halfway in between these two numbers, which is 3.3mAs (we rounded down to 3.2mAs because of consol settings). We then proceeded to shoot our image at 66kVp (we used the same kVp as a Lateral Foot for a starting point) and 3.2mAs at a 48” SID, the resulting DI was 2.7, indicating overexposure. We then decreased our mAs by 60% to 1.6mAs. We then shot our next image at 66kVp and 1.6mAs, resulting in a DI of 0.