Carpal Canal Tangential Projections
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| What are the two Carpal Canal projections? | Tangential Projection: Inferosuperior
Tangential Projection: Superoinferior
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| Tangential: Inferosuperior Collimation? patient positioning? IR placement? Central Ray? Shield | 8x10
Seated at the end of the table so the forearm is parallel with the long axis of the table
Center the IR to the joint at the level of the radial styloid process after hyperextending the wrist
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| Tangential: Inferosuperior Central Ray? Shield | Directed to the palm of the hand at a point 1" distal to the base of the 3rd MC and at an angle of 25-30 degrees to the long axis of the hand
Shield is required
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| Tangential: Superoinferior Collimation? patient positioning? IR placement? | 8x10
Dorsiflex the wrist as much as possible and lean forward to place the carpal canal tangent to the IR
Center the carpal canal to the IR
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| Tangential: Superoinferior Central Ray? Shield | Tangential to the carpal canal at the level of the midpoint of the wrist
Shield is required
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| With reference to the plane of the IR, how should the long axis of the hand be positioned for a Tangential? | Vertical
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| With reference to the long axis of the hand, how much should the central ray be angled? | 25-30 degrees
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