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Principles of Interpretation

www.upei.ca/~vetrad. It's Magic. Imagination if more important than knowledge?.. www.upei.ca/~vetrad. Viewing the Radiographs. Quite, dark room, no distractionsAt least 2 well lit view boxesHot light should be available3 dimensional conceptFrom a 2 dimensional image the 3rd dimension must be con

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Principles of Interpretation

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    1. www.upei.ca/~vetrad Principles of Interpretation Dr. LeeAnn Pack Dipl. AVCR

    2. www.upei.ca/~vetrad It’s Magic Imagination if more important than knowledge….

    3. www.upei.ca/~vetrad Viewing the Radiographs Quite, dark room, no distractions At least 2 well lit view boxes Hot light should be available 3 dimensional concept From a 2 dimensional image the 3rd dimension must be constructed Orthogonal views Anatomy text, anatomical specimens, notes

    4. www.upei.ca/~vetrad Viewing the Radiographs Radiographs should be placed on the view box the same way every time Laterals Animal’s head to the viewer’s left Spine is at the top VD or DV Animal’s head is at the top Animal’s right is to the viewer’s left

    5. www.upei.ca/~vetrad Viewing the Radiographs Limbs Lateral and Obliques Proximal is to the top Cranial or Dorsal is to the viewer’s left Dorsopalmar / dorsoplantar Proximal is to the top Lateral can be to the viewers right or left I usually place them as if the patient were laying in front of me

    6. www.upei.ca/~vetrad The Radiograph Ensure the image is of the correct patient Images are correctly labeled High technical quality – adequate collimation, exposure, development and are free of artifacts Is it normal, abnormal, artifactual?

    7. www.upei.ca/~vetrad Radiographic Opacities Metal Mineral – Bone Soft tissue – fluid Fat Air

    8. www.upei.ca/~vetrad Evaluating the Radiograph Take into account the patient history and clinical signs Does an abnormality exist? Perception of abnormal Where exactly is the abnormality? Describe the roentgen signs Opinion Rule out list of prioritized differentials

    9. www.upei.ca/~vetrad Roentgen Signs Size Shape Margination Number Change in position Alteration in opacity Change in function of organs Roentgen signs should be correlated with history, physical exam, disease patterns, pathogenesis etc.

    10. www.upei.ca/~vetrad Other Summation – same opacity do not touch but are superimposed ? the opacity where they overlap is increased Silhouette sign – structures of the same opacity touch and their margins are lost Contrast Media GI, GU, neuro etc.

    11. www.upei.ca/~vetrad Pitfalls to Interpretation Do not get distracted by a large mass for example and forget the rest of the radiograph Tunnel vision Must use a systematic approach - every time

    12. www.upei.ca/~vetrad Summary Properly displayed, Viewing environment, technical quality Normal or abnormal – must know anatomy Systematic evaluation and correlation with clinical data Correct diagnosis or send to someone for help

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