Hand - Ballcatchers

From wikiRadiography
Jump to navigation Jump to search

Radiographic Positioning

Other related pages of interest

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
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
  • 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

  • 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
  • include distal phalanges and carpal area
  • 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