Lateral Foot
Lateral Foot
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Lateral Foot. By using the Technique by Proportional Anatomy table, we know that an AP Foot is equal to 1/4 an AP Knee, and a Lateral Foot is equal to 2 times the AP Foot.
Considering the resulting technique we found from the previous weeks experiments, we knew that the kVp is 66 and the mAs is 5 for an AP Knee. The resulting DI of this projection was 0.
Therefore, we decreased our mAs of 5 by 1/4 to 1.25 for the AP Foot. Then, we multiplied our mAs for AP Foot by 2 to 2.5 for the Lateral Foot. We proceeded to shoot our first image at 66kVp and 2.5mAs, resulting in a DI of 2.2, indicating overexposure. To fix this, we decreased our mAs by 40% to 1.6 and fixed collimation. We then shoot at 66kVp and 1.6mAs, resulting in a DI of -0.1.
BREAKDOWN
BREAKDOWN
Technique by Proportional Anatomy states:
Technique by Proportional Anatomy states:
AP Foot = 1/4 AP Knee
Lateral Foot = 2x AP Foot
Techniques Used and Resulting DI:
Techniques Used and Resulting DI:
Referenced Technique: AP Knee = 66kVp 5mAs DI: 0
Attempt #1: Lateral Foot = 66kVp 2.5mAs DI: 2.2
Final Attempt #2: Lateral Foot = 66kVp 1.6mAs DI: -0.1
Begin with an optimal technique for an AP Knee.
Solve for 1/4 of an AP Knee for AP Foot.
Shoot first attempt. (Result: overexposure by 2.2)
Decrease mAs by 40%.
Shoot second attempt (Result: in range: -0.1)
66kVp @ 5mAs
1/4 of 5mAs = 2.5mAs
66kVp @ 2.5mAs
2.5mAs decrease by 40% = 1.6mAs
66kVp @ 1.6mAs
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