Saturday, February 4, 2012


Do not attempt to rotate arm if fracture or dislocation is suspected.

See Transthoracic Lateral

Pathology Demonstrated:
Fracture and dislocations of the mid-and distal humerus, as well as other pathologic processes such as osteoporosis  and arthritis, are demonstrated.

Technical Factors:
IR size - 30 x 35 cm (11 x 14 inches); for smaller patient, 24 x 30 cm (10 x 12 inches)
Detail screen, non-grid with film screen imaging
64 +- 6 kV range

Place lead shield over thorax and pelvis, between the cassette and the patient.

Patient and Part Position:
With patient recumbent, perform image as a horizontal beam lateral, placing support under the arm.
Flex elbow if possible, but do not attemp to rotate arm: projection should be 90degree from AP.
Gently place cassette between arm and thorax (top of IR to axilla)

Central Ray:
CR perpendicular to midpoint of distal two-thirds of humerus
Minimum SID of 40 inches (100cm)

Collimate to soft tissue margins.

Suspend respiration during exposure. (This step is important in preventing movement of the cassette during the exposure.)

Radiographic Criteria:

Structure shown:
A lateral projection of the mid-and distal humerus, including the elbow joint, is visible.
The distal two-thirds of the humerus should be well visualized.

The long axis of the humerus should be aligned with long axis of the IR.
The elbow is flexed 90 degree.

Collimation and CR:
Collimation border should be visible at the skin margins along the length of the humerus.
CR and center of collimation field should be to the approximate midpoint of the distal two-thirds of the humerus.

Exposure Criteria:
Optimal density and contrast with no motion should visualize sharp visualize sharp cortical borders and clear sharp bony trabecular markings.

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