Indications for imaging
Trauma, Degenerative conditions, gout,
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Anatomy Demonstrated
Tarsal bones, metatarsals and phalanges.
Foot DP Rt. Anatomy
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy
Saunders, London
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Basic Patient Position
The patients lies or sits on the table legs extended, the
affected limb is flexed at the knee to bring the plantar aspect
of the foot in flat contact with the cassette.
Foot DP Lt. Patient Position
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy
Saunders, London
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Radiation protection
Direct lead rubber gonad protection using a "half
apron".
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Central Ray
a) The vertical central ray is centered to the head of the third
metatarsal.
b) The central ray is angled 10 degrees cephalad and centered to
the head of the third metatarsal brining the central ray 90
degrees to the metatarsals.
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Exposure Factors
| Kv |
mAS |
FFD (cm) |
Grid |
Focus |
AEC |
Cassette |
| 55 |
5 |
100 |
No |
Fine |
No |
24 x 30 cm |
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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 phalanges, proximally
the navicular, medially and laterally the skin surfaces.
There should be visualisation of the joint space between the
heads of the first and second metatarsals, and the second
to fourth metatarsal shafts should be symmetrical.
Optimal exposure should penetrate all the bone structures and
contrast should be low enough to visualise fully the bone and
soft tissue structures.
Foot DP Lt. Radiograph
http://www.vh.org/Providers/TeachingFiles/NormalRadAnatomy/Images/
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Related Projections
Foot DP oblique and Lateral
Tarsal bone and toes projections
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Additional modalities
RNI
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