AP Pelvis

AP Pelvis. We used the Technique by Proportional Anatomy table to find its optimal technique. Using the table we know that an AP pelvis is equal to an AP abdomen and an AP abdomen mAs is 2/3 of the mAs of a PA skull.

The optimal technique for a PA skull is 85 kVp and 20 mAs. Therefore, 2/3 of 20 is 13.3 mAs (real world 14 mAs). Using 85 kVp and 14 mAs for an AP pelvis it resulted in a DI value of 1.9. To fix the DI value we decreased the mAs by 40% (2x20%) to get 9. Now using 85 kVp and 9 mAs it resulted in a DI value of -0.1.

BREAKDOWN

Technique by Proportional Anatomy states:

AP Pelvis = AP Abdomen

AP Abdomen = 2/3 PA Skull

Techniques Used and Resulting DI:

Referenced Technique: PA Skull = 85kVp 20mAs DI: 0

Attempt #1: AP Pelvis = 85kVp 14mAs DI: 1.9

Final Attempt #2: AP Pelvis = 85kVp 9 mAs DI:-0.1

Begin with an optimal technique for a PA Skull.
Solve for 2/3 the mAs of a PA Skull for AP Abdomen.
Use optimal technique for AP Abdomen for AP Pelvis.
Shoot first attempt (Result: overexposure by 1.9).
Decrease mAs by 40%.
Shoot second attempt (Result: in range: -0.1)

85kVp @ 20mAs
2/3 of 20mAs = 13.3mAs (14mAs)
85kVp @ 14mAs
85kVp @ 14mAs
14mAs decrease by 40% = 9mAs
85kVp @ 9mAs

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