Image production & evaluation

Which of the following is (are) valid evaluation criteria for a lateral projection of the forearm?
1. The radius and the ulna should be superimposed distally.
2. The coronoid process and the radial head should be partially superimposed.
3. The humeral epicondyles should be superimposed.
Which of the following is (are) evaluation criteria for a PA chest for heart and lungs?
1. Ten posterior ribs should be seen above the diaphragm.
2. The medial ends of the clavicles should be equidistant from the vertebral column.
Sufficient inspiration is demonstrated by
visualization of 10 posterior ribs projected above the diaphragm
The size of a particular structure or image can be calculated using the following formula:
image size = SID
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object size = SOD (SID-OID)
plantodorsal projection of the calcaneus.
The patient is usually positioned with the leg extended and the long axis of the plantar surface perpendicular to the tabletop/image recorder. The central ray is directed 40° cephalad to the base of the third metatarsal. Structures that should be visualized include the sustentaculum tali, trochlear process, and calcaneal tuberosity