Hand - BallcatchersThis is a featured page

Radiographic Positioning


Adult
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Name of projection Hand - "Ball-catchers"
Area Covered Both hands from the carpal area and entire digits
Pathology shown Radiographic signs of rheumatoid arthritis
Radiographic Anatomy Hand Radiographic Anatomy
IR Size & Orientation 24 x 30cm
Landscape
Film / Screen Combination Detail
(CR and DR as recommended by manufacturer)
Bucky / Grid No
Filter No
Exposure 50 kVp
2.5 mAs
FFD / SID 100cm
Central Ray Midway between the hands at the level of the metacarpophalangeal joints
Perpendicular to the IR
Collimation Centre: At the level of the metacarpophalangeal joints, midway between the hands
Shutter A: To include distal phalanges to 2.5cm of the distal radius and ulna
Shutter B: Include soft tissues
Markers Distal and Lateral
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
Respiration Not applicable
Positioning
  • Patient seated at end of table
  • Supinate hands
  • Medial side of hands together and in the centre of the IR
  • Roll the hands 45° so their lateral aspect is up
  • Two 45° sponges can be used under the posterior aspect of the hand to achieve this
  • Cup the fingers slightly as though catching a ball
  • Abduct thumb slightly to avoid superimpostion
Critique

Positioning
  • The hand is obliqued 45°, shown by
    • 2nd through to 5th mid-shafts of the metacarpals do not overlap
    • Bases of phalanges do not overlap
  • Open metacarpophalangeal joints
  • Thumbs free of superimposition
Area Covered
  • Phalanges, metacarpals and carpals
Collimation
  • include distal phalanges and carpal area
Exposure
  • Density such that the joint space margins of the metacarpophalangeal joints are clearly demonstrated
  • Bony trabecular patterns and cortical outlines are sharply defined
Special Notes



AndyC
AndyC
Latest page update: made by AndyC , Jun 17 2011, 9:28 AM EDT (about this update About This Update AndyC Edited by AndyC

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