The humerus, scapula and clavicle share about the same thickness. All these parts are greater than 10cm which means these parts need a grid. Since all these parts need a grid and are of similar size we can use about the same range of kVp of lower to mid 70s. We started with the knee and shoulder exposure factors and made small adjustments based on what was needed to obtain the highest quality image.
*Lateral Humerus
This Image is good because the entire Humerus bone is shown with both articulating ends. The arm is in a true lateral evident by the superimposed epicondyles.
AP Humerus
70 kVp 3.6 mAs
Grid 10:1
10x17 FOV
40" SID
DI -0.2
Lateral Humerus
70 kVp 3.6 mAs
Grid 10:1
10x17 FOV
40" SID
DI -0.1
*Scap Y
This Image of the scapula is good because you can see the entire body of the scapula in profile. This is because you can see the acromion and the corocoid in this projection.
AP Scapula
72 kVp 4.5 mAs
Grid 10:1
10x12 FOV
40" SID
DI -1.1
Scap Y Scapula
72 kVp 4.5mAs
Grid 10:1
10x12 FOV
40" SID
DI -0.3
*AP Clavicle
This Image of the clavicle is well done because we can see the entire left clavicle and the midclavicle is superimposed over the superior end of the scapula.
AP Clavicle
75 kVp 7.1 mAs
Grid 10:1
10x12 FOV
40" SID
DI 0.1
AP Axial Clavicle
75 kVp 10 mAs
Grid 10:1
10x12 FOV
40" SID
DI 0.5