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Questions and Answers
What is the recommended collimation for the mediolateral ankle projection?
What is the recommended collimation for the mediolateral ankle projection?
What is the purpose of the 45° medial oblique projection of the ankle?
What is the purpose of the 45° medial oblique projection of the ankle?
What should be included in the collimation field for the lateral ankle projection?
What should be included in the collimation field for the lateral ankle projection?
What is the patient position for the mediolateral ankle projection?
What is the patient position for the mediolateral ankle projection?
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What is the purpose of the 45° internal oblique projection of the ankle?
What is the purpose of the 45° internal oblique projection of the ankle?
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What is the minimum SID for ankle imaging?
What is the minimum SID for ankle imaging?
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What is the recommended IR size for ankle imaging?
What is the recommended IR size for ankle imaging?
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What is the recommended shielding for ankle imaging?
What is the recommended shielding for ankle imaging?
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What is the patient position for the AP stress ankle projection?
What is the patient position for the AP stress ankle projection?
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What is the recommended minimum SID for the ankle joint projection?
What is the recommended minimum SID for the ankle joint projection?
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How should the lateral portion of the ankle joint space appear on the ankle joint projection?
How should the lateral portion of the ankle joint space appear on the ankle joint projection?
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What is the recommended kV range for digital imaging systems for ankle joint projections?
What is the recommended kV range for digital imaging systems for ankle joint projections?
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How should the foot be positioned for a true AP projection of the ankle joint?
How should the foot be positioned for a true AP projection of the ankle joint?
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What should be included in the collimation for ankle joint projections?
What should be included in the collimation for ankle joint projections?
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What position should the patient be in for ankle joint projections?
What position should the patient be in for ankle joint projections?
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What should be done if the intermalleolar line is parallel to the IR for ankle joint projections?
What should be done if the intermalleolar line is parallel to the IR for ankle joint projections?
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What shielding measure should be taken for ankle joint projections?
What shielding measure should be taken for ankle joint projections?
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Why is forced dorsiflexion of the foot discouraged for ankle joint projections?
Why is forced dorsiflexion of the foot discouraged for ankle joint projections?
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What is the recommended IR size for ankle joint projections?
What is the recommended IR size for ankle joint projections?
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What is the recommended minimum source-to-image distance (SID) for ankle radiography?
What is the recommended minimum source-to-image distance (SID) for ankle radiography?
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What is the suggested position for the patient during ankle radiography?
What is the suggested position for the patient during ankle radiography?
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What should be demonstrated in an ankle radiograph according to the evaluation criteria?
What should be demonstrated in an ankle radiograph according to the evaluation criteria?
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How should the long axis of the leg be aligned for ankle radiography?
How should the long axis of the leg be aligned for ankle radiography?
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What is the recommended degree for dorsiflexing the foot during ankle radiography?
What is the recommended degree for dorsiflexing the foot during ankle radiography?
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What is the proper part positioning for ankle radiography?
What is the proper part positioning for ankle radiography?
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What should be visible in an optimal exposure for ankle radiography?
What should be visible in an optimal exposure for ankle radiography?
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What is the recommended shielding practice for ankle radiography?
What is the recommended shielding practice for ankle radiography?
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Where should the central ray (CR) be directed for ankle radiography?
Where should the central ray (CR) be directed for ankle radiography?
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What may the appearance of an open lateral portion of the ankle joint on a true AP projection suggest?
What may the appearance of an open lateral portion of the ankle joint on a true AP projection suggest?
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What angle should the CR be directed for the CR Direct CR inferosuperiorly projection?
What angle should the CR be directed for the CR Direct CR inferosuperiorly projection?
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What is the major advantage of the CR Direct CR inferosuperiorly method?
What is the major advantage of the CR Direct CR inferosuperiorly method?
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What is the recommended degree of knee flexion for the Hughston Method projection?
What is the recommended degree of knee flexion for the Hughston Method projection?
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What is the major disadvantage of the Hughston Method projection?
What is the major disadvantage of the Hughston Method projection?
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What is the purpose of adjusting the rotation of the body and leg for the lateral knee projection?
What is the purpose of adjusting the rotation of the body and leg for the lateral knee projection?
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What is the recommended flexion degree for the knee in the lateral knee projection?
What is the recommended flexion degree for the knee in the lateral knee projection?
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What should the CR be directed to in the lateral knee projection?
What should the CR be directed to in the lateral knee projection?
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What is the recommended collimation for the lateral knee projection?
What is the recommended collimation for the lateral knee projection?
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What is the recommended minimum SID for the lateral knee projection?
What is the recommended minimum SID for the lateral knee projection?
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What is the recommended IR size for the lateral knee projection?
What is the recommended IR size for the lateral knee projection?
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What should be the patient's position for the lateral knee projection?
What should be the patient's position for the lateral knee projection?
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What is the purpose of the 18 from lateral knee technique?
What is the purpose of the 18 from lateral knee technique?
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What is the recommended degree of knee flexion for the Settegast Method?
What is the recommended degree of knee flexion for the Settegast Method?
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What is the recommended minimum source-to-image distance (SID) for the Inferosuperior Projection?
What is the recommended minimum source-to-image distance (SID) for the Inferosuperior Projection?
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What is the purpose of the Hobbs Modification SuperoInferior Tangential Method?
What is the purpose of the Hobbs Modification SuperoInferior Tangential Method?
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What is the recommended IR size for the Inferosuperior Projection?
What is the recommended IR size for the Inferosuperior Projection?
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What is the major advantage of the Hughston Method projection?
What is the major advantage of the Hughston Method projection?
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What is the recommended kV range for digital systems during the Settegast Method?
What is the recommended kV range for digital systems during the Settegast Method?
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What is the patient position for the Hobbs Modification SuperoInferior Tangential Method?
What is the patient position for the Hobbs Modification SuperoInferior Tangential Method?
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What is the recommended IR size for the Hughston Method?
What is the recommended IR size for the Hughston Method?
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What is the recommended SID for the Settegast Method?
What is the recommended SID for the Settegast Method?
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What is the purpose of using sandbags and tape in the Inferosuperior Projection?
What is the purpose of using sandbags and tape in the Inferosuperior Projection?
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What is the recommended degree of knee flexion for the Inferosuperior Projection?
What is the recommended degree of knee flexion for the Inferosuperior Projection?
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What is the recommended IR size for the Settegast Method?
What is the recommended IR size for the Settegast Method?
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Study Notes
Ankle Radiography Techniques and Evaluation Criteria
- Anatomic position for true AP projection results in the lateral malleolus being about 15° more posterior than the medial malleolus
- The lateral portion of the ankle joint should not appear open on a true AP projection
- Spread of the ankle mortise from ruptured ligaments may be suggested if the lateral portion of the ankle joint appears open on a true AP projection
- Key anatomical structures to be demonstrated in an ankle radiograph include the distal one-third of tibia-fibula, lateral and medial malleoli, talus, and proximal half of metatarsals
- Long axis of the leg should be aligned to the collimation field and to the image receptor, with minimal rotation
- Optimal exposure with no motion should demonstrate clear bony margins and trabecular markings, with visible soft tissue structures
- The evaluation criteria for the ankle radiography include the demonstration of the ankle mortise and the proximal fifth metatarsal, a common fracture site
- Technical factors for ankle radiography include a minimum source-to-image distance (SID) of 40 inches, IR size of 24 × 30 cm, and shielding of radiosensitive tissues outside the region of interest
- Patient position for ankle radiography is supine with a pillow under the head and fully extended legs
- Proper part positioning involves centering and aligning the ankle joint to the image receptor and not dorsiflexing the foot
- The CR should be perpendicular to the image receptor and directed midway between the malleoli
- If the patient's condition allows, the foot should be dorsiflexed so that the plantar surface is at least 80° to 85° from the image receptor, and the leg and foot should be rotated medially 45°
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Description
Test your knowledge of ankle radiography techniques and evaluation criteria with this quiz. Learn about the proper anatomical positioning, technical factors, and evaluation criteria for obtaining clear and accurate ankle radiographs.