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Essential Techniques for Shoulder Imaging: AP, Lateral, and Transthoracic Views

DESCRIPTION

This guide covers the essential techniques for shoulder imaging using three common views: anteroposterior (AP), lateral, and transthoracic. Each section provides detailed instructions on patient positioning, collimation, and central ray (CR) positioning for optimal visualization of the shoulder anatomy. Key elements include marker placement, shielding considerations, and the precise measurement of projections. The guide aims to ensure accurate and effective imaging of the proximal humerus, clavicle, and scapula for diagnostic purposes, helping radiologists evaluate shoulder pathology accurately.

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Essential Techniques for Shoulder Imaging: AP, Lateral, and Transthoracic Views

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Presentation Transcript

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  1. The Shoulder

  2. Things to know • 3 views AP, Lateral, Transthoracic • 10 x 12 cassette • Marker • Shield • Collimation • Measures 12 on AP and Lateral • 70 @6

  3. AP External Rotation • 10 x 12 crosswise • Place the posterior side of the shoulder to IR • center shoulder to center of IR • Externally rotate arm until the epicondyles are parallel with IR • Hold breath

  4. CR 3/4 inch inferior to coracoid processSID 40

  5. Seen on Film • The Proximal humerus • 2/3 of clavicle • The upper scapula • The greater tubercle in profile

  6. AP Internal Rotation • 10x 12 crosswise • Same position as external • But rotate the arm internally until the epicondyles are perpendicular to IR • Hold breath

  7. CR ¾ inch inferior to coracord SID 40

  8. Seen on film • The lesser tubercle in profile

  9. Transthoracic • 10 x 12 lengthwise • Measure 34 • 75@60

  10. Positioning Transthoracic • Place affected shoulder against IR • Raise the good arm over the head • Center the surgical neck to IR • Patient in true lateral position • Breath normally

  11. CR directed through surgical neck SID 40

  12. Seen on film • Lateral view of the proximal half of humerus • No superimposition of other shoulder

  13. The Humerus

  14. The AP and Lateral Projections Cassette size 14 x17 lengthwise One cassette per view Measures 9 70@6 Shield Mark Collimate Hold breath

  15. Part Position for AP • Place patient’s shoulder in contact with table or bucky. • Extend the arm as far as patient is able • Abduct arm slightly and supinate hand until the epi-condyles are parallel with IR

  16. Central Ray perpendicular to Mid-HumerusSID 40

  17. Seen on Radiograph for AP • The entire humerus including both joints • The greater tubercle is seen in profile laterally • lateral and medial epi-condyles in profile.

  18. Part Position for Lateral • Same position as AP • Internally rotate the hand until the epi-condyles are perpedicular with IR

  19. CR Mid-Humerus SID 40

  20. Seen on radiograph for lateral • Entire humerus including both joints • The epi-condyles are superimposed • The lesser tubercle is seen in profile medially.

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