Indications for imaging
Trauma, rheumatology.
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Anatomy Demonstrated
The phalanges and interphalangeal joints in true lateral
position demonstrating the interphalangeal joints.
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Basic Patient Position
The patient sits alongside the end of the table elbow flexed and
the hand in true lateral position the fingers are then flexed
and the finger in question extended parallel to the film, a radio lucent
pointer may aid maintenance of the extension. For fingers other
than the middle the hand is rotated to the lateral position
bringing the finger in question nearest the film or in contact
with it for the 2nd and 5th.
|
Radiation protection
Direct lead rubber gonad protection using a "half
apron".
Ensure the lower limbs and torso are not below the table top in
the primary beam.
|
Central Ray
The vertical central ray is directed to the proximal
interphalangeal (PIP) joint.
|
Exposure Factors
| Kv |
mAS |
FFD (cm) |
Grid |
Focus |
AEC |
Cassette |
| 50 |
4 |
100 |
No |
Fine |
Non |
18 x 24 cm |
|
Evaluation of the Image
ID and markers must be present and correct in the appropriate
area of the film
Evidence of collimation on four sides equally around the
centering point.
Limits of the examination, distally the tip of the finger proximally
the metacarpo phalangeal joint, laterally the soft tissue
margins of the finger.
The central ray should pass through the PIP involved,
visualising the joint space, when true lateral the palmar
aspects of the phalanges appear concave.
Exposure, adequate penetration to visualise all bone detail and
low enough contrast to visualise the soft tissues.
Rt Third finger Lateral Radiograph
|
Related Projections
Hand DP, DP Oblique and lateral
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Additional modalities
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