Sunday, December 18, 2011

Pathology Demonstrated:
  • The lateral in either extension or flexion is an alternative to the fan lateral for localization of foriegn bodies of the hand and fingers; it also demonstrate anterior and posterior displaced fracture of metacarpals.
  • The lateral in natural flexed position may be less painful for the patient.

Technical Factor:
  • IR size - 18 x 24 cm (8 x 10 inches), lengthwise
  • Detail screen or digital IR, tabletop
  • 55 to 65 kV range

  • Place lead shield over patient's lap to shield gonads.

Patient position:
  • Seat patient at end of table with elbow flexed about 90degrees and hand and forearm resting on table.

Part Position:
  • Rotate hand and wrist, with thumb side up, into a true lateral position, with second to fifth MCP joints centered to IR and CR.
  • Lateral in Extension: Extend finger and thumb, and support against a radiolucent support block. Ensure that all fingers and metacarpals are superimposed directly for a true lateral position.
  • Lateral in Flexion: Flex finger into natural flexed position, with thumb lightly touching the first finger; maintain true lateral position.

Central Ray:
CR perpendicular to IR, directed to the second to fifth MCP joints.
Minimum SID of 40 inches (100cm)

  • Collimate to outer margins of hand and wrist.

Radiographic Criteria:
Structure shown:
Entire hand and wrist and about 2.5cm (1 inch) of distal forearm are visible.
Thumb should appear slightly oblique and free of superimposition with joint spaces open.

  • Long axis of the hand and wrist are aligned with long axis of the IR.
  • Hand and wrist should be in a true lateral position, as evidenced by the following: Distal radius and ulna are superimposed; Metacarpals and phalanges are superimposed.

Collimation and CR:
  • Collimation should be visible on four sides to area of affected hand.
  • CR and center of collimation field should be at second to fifth MCP joints.

Exposure Criteria:
  • Optimal density and contrast with no motion demonstrate soft tissue margins and clear, sharp bony trabecular markings.
  • Margins of individual metacarpals and phalanges are visible but mostly are superimposed.

Subscribe your email address now to get the latest articles from us

Copyright © 2015. RadTechOnDuty.
Design by Herdiansyah Hamzah. Published by Themes Paper. Powered by Blogger.
Creative Commons License