Clavical

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24 Terms

1
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What clavicle projections are listed on the ARRT guideline?
AP or PA, AP axial, and PA axial.
2
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Where is the CR centered for an AP clavicle?
Perpendicular to the midshaft of the clavicle.
3
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How is the patient positioned for an AP clavicle?
Supine or upright with the posterior shoulder against the IR.
4
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What anatomy should be included on an AP clavicle?
Entire clavicle, including AC and SC joints.
5
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What should be visible superior to the clavicle on a proper AP image?
Soft tissue and lung apex, with the clavicle above the ribs.
6
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Which projection reduces OID because the clavicle is closer to the IR?
PA clavicle.
7
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Where does the CR exit for a PA clavicle?
Midshaft of the clavicle.
8
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How is the patient positioned for a PA clavicle?
Standing or prone with the anterior shoulder against the IR.
9
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What is the main advantage of PA versus AP clavicle?
Less OID and better spatial resolution.
10
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What CR angle is used for an AP axial clavicle?
15–30° cephalad.
11
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Where is the CR centered for an AP axial clavicle?
Midshaft of the clavicle.
12
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What is the purpose of the AP axial clavicle view?
Project the clavicle above the ribs and scapula.
13
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How is the patient positioned for an AP axial clavicle?
Supine or upright.
14
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What happens to the clavicle on an AP axial image?

It is projected more superiorly; above the scapula and most of the 2nd/3rd ribs

15
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What CR angle is used for a PA axial clavicle?
15–30° caudad.
16
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Where is the CR centered for a PA axial clavicle?
Midshaft of the clavicle.
17
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How is the patient positioned for a PA axial clavicle?
Prone or standing facing the IR.
18
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What is the purpose of the PA axial clavicle view?
Project the clavicle above the ribs with reduced OID.
19
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AP axial vs PA axial clavicle: what is the CR direction?
AP axial = cephalad; PA axial = caudad.
20
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Which clavicle projection generally gives better spatial resolution, AP or PA?
PA, because the clavicle is closer to the IR.
21
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Why does the CR angle vary from 15–30° for an AP axial clavicle?
It depends on body habitus and the angle of the clavicle.
22
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What CR angle is appropriate for a hypersthenic patient for an AP axial clavicle?
About 15° cephalad.
23
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What CR angle may be needed for a thin/asthenic patient for an AP axial clavicle?
Closer to 30° cephalad.
24
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AP axial clavicle body-habitus rule?
Thick = less angle; thin = more angle.