ARRT Review- Positioning
Terms
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- Central Ray for a PA and oblique hand?
- 3rd MPJ
- What do you do for a lateral hand in extension if you are looking for a foreign object?
- dcrease KVP by 10
- A hand in lateral flexion is done to show what?
- anterior/posterior fracture displacement
- Where do you center for a pa and lateral finger
- proximal IPJ
- Where do you center for an AP, PA, and lateral thumb?
- MPJ
- What is the PA semi pronation wrist and used to see?
- Scaphoid and lateral carpals
- AP semi pronation oblique is used to see what?
- pisiform, triquetrum, hamate and medial carpals
-
In ulnar flexion/deviation do you move hand medial or lateral?
Where do you center?
What is it used to see? -
lateral
scaphoid
Scaphoid and other lat carpals, reduces foreshortening of navicular -
What is the positioning for carpal canal(Gaynor-Hart)?
Where is the CR?
What is visualized? -
Hyperextend wrist with palm vertical
25-30 degrees into long axis of hand
Carpal Canal- trapezium, scaphoid capitate, triquetrum, pisiform - When doing a forearm should the shoulder and elbow be on the same plane?
- yes
- the medial (internal) oblique elbow is done to visualize what?
- coronoid process
- What is the lateral (external) oblique elbow used to visualize?
- Radial head, neck, and tuberosity free from superimposition
- In an AP Humerus do you see the greater or lesser tubercle?
- Greater
- Do you see the greater or lesser tubercle in lateral humerus?
- Lesser
- Where is the central ray for the AP shoulder?
- coracoid process
- What does the external shoulder visualize?
- greater tubercle
- What does a shoulder done in neutral position visualize?
- Calcific deposits and trauma
- Internal shoulder is done to visualize what?
- lateral of humerus and lesser tubercle
-
What is the positioning for a transthoracic lateral shoulder?
What is visualized? -
lateral with affected surgical neck centered to film, unaffected arm overhead. CR to surgical neck.
Lateral Shoulder and proximal humerus through thorax -
What is the position for a PA oblique shoulder (scapular y)?
Why is this view done? -
Affected shoulder centered with mcp 60 degrees to film. CR to shoulder joint.
Good for demonstration of dislocations -
Where is the CR in a PA Axial clavicle?
Why is this done? -
25-30 degrees caudad to the supraclavicular fossa
can demonstrate fractures not seen in PA or AP - What is the positioning for AP scapula?
- centered w/ arm abducted and elbow flexed. CR midscapula 2" inferior to coracoid process
-
What is the positioning for a lateral scapula?
What does this visualize? -
Erect PA 45-60 degree oblique with affected side toward image receptor. Arm across the chest, or super impose scapular borders.
Arm across chest- acromion and coracoid processes
superimposed- super imposed borders free of rib cage - Where is the CR directed in the Dorso plantar, medial oblique, and lateral foot?
- base of 3rd metatarsal. in dorso CR angled 10 degrees cephalic.
- What is the angle of the medial oblique foot?
- 30 degrees
- Where is the CR directed to in dorso plantar toe?
- 10 degrees cephalic to 2nd MPJ