AP Forearm
AP Forearm
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AP Forearm. By using the Technique by Proportional Anatomy table, we know that an AP Forearm is halfway between the Wrist and Elbow.
The table also tells us that Wrist is 1/2 of AP Foot and Elbow is equal to AP Foot.
We already know that our mAs for AP Foot is 1.25. Since Wrist is 1/2 of this, we will be using 0.625mAs and since Elbow is equal, we will be using 1.25mAs.
Since AP Forearm is halfway between these two numbers (0.625mAs and 1.25mAs) we will be using 0.9mAs. We proceeded to shoot the image at 66kVp and 0.9mAs, resulting in a DI of 0.4.
BREAKDOWN
BREAKDOWN
Technique by Proportional Anatomy states:
Technique by Proportional Anatomy states:
AP Forearm = halfway between Wrist and Elbow
Wrist = 1/2 AP Foot
Elbow = AP Foot
Techniques Used and Resulting DI:
Techniques Used and Resulting DI:
Referenced Technique: AP Foot = 1.25mAs
Final Attempt #1: AP Forearm = 66kVp 0.9mAs DI: 0.4
Begin with an optimal technique for an AP Foot.
Solve for 1/2 of an AP Foot for Wrist.
Use optimal technique for AP Foot for Elbow.
Find halfway between Wrist and Elbow.
Shoot first attempt (Result: in range: 0.4)
1.25mAs
1/2 of 1.25mAs = 0.625mAs
1.25mAs
Halfway between 0.625mAs and 1.25mAs = 0.9mAs
66kVp @ 0.9mAs
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