Ankle Radiography Techniques and Evaluation Criteria Quiz

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Questions and Answers

What is the recommended collimation for the mediolateral ankle projection?

To include entire lower leg and foot
To include only the ankle joint
To include distal tibia and fibula only
To include distal tibia and fibula to midmetatarsal area (correct)

What is the purpose of the 45° medial oblique projection of the ankle?

To demonstrate the distal tibiofibular joint open (correct)
To demonstrate the tibiotalar joint open with uniform joint space
To evaluate fractures of the fifth metatarsal
To visualize the lateral malleolus and talus joint

What should be included in the collimation field for the lateral ankle projection?

Distal tibia and fibula to midmetatarsal area
Only the lateral malleolus and talus joint
Distal one-third of lower leg, calcaneus, tuberosity of fifth metatarsal, and surrounding soft tissue structures (correct)
Entire lower leg and foot

What is the patient position for the mediolateral ankle projection?

Lateral recumbent position, affected side down (D) Signup and view all the answers

What is the purpose of the 45° internal oblique projection of the ankle?

To visualize the base of the fifth metatarsal (C) Signup and view all the answers

What is the minimum SID for ankle imaging?

40 inches (102 cm) (B) Signup and view all the answers

What is the recommended IR size for ankle imaging?

24 × 30 cm (10 × 12 inches), lengthwise (A) Signup and view all the answers

What is the recommended shielding for ankle imaging?

Shield radiosensitive tissues outside the region of interest (D) Signup and view all the answers

What is the patient position for the AP stress ankle projection?

Sitting position (A) Signup and view all the answers

What is the recommended minimum SID for the ankle joint projection?

40 inches (B) Signup and view all the answers

How should the lateral portion of the ankle joint space appear on the ankle joint projection?

Not appear open (A) Signup and view all the answers

What is the recommended kV range for digital imaging systems for ankle joint projections?

60 to 70 kV (A) Signup and view all the answers

How should the foot be positioned for a true AP projection of the ankle joint?

In its natural position (B) Signup and view all the answers

What should be included in the collimation for ankle joint projections?

Proximal one-half of metatarsals and distal tibia-fibula (D) Signup and view all the answers

What position should the patient be in for ankle joint projections?

Supine position (A) Signup and view all the answers

What should be done if the intermalleolar line is parallel to the IR for ankle joint projections?

Adjust the foot and ankle for a true AP projection (B) Signup and view all the answers

What shielding measure should be taken for ankle joint projections?

Shield radiosensitive tissues outside region of interest (D) Signup and view all the answers

Why is forced dorsiflexion of the foot discouraged for ankle joint projections?

It can be painful and may cause additional injury (B) Signup and view all the answers

What is the recommended IR size for ankle joint projections?

24 × 30 cm (10 × 12 inches), lengthwise (A) Signup and view all the answers

What is the recommended minimum source-to-image distance (SID) for ankle radiography?

40 inches (A) Signup and view all the answers

What is the suggested position for the patient during ankle radiography?

Supine with a pillow under the head and fully extended legs (D) Signup and view all the answers

What should be demonstrated in an ankle radiograph according to the evaluation criteria?

The proximal fifth metatarsal (C) Signup and view all the answers

How should the long axis of the leg be aligned for ankle radiography?

Parallel to the image receptor (A) Signup and view all the answers

What is the recommended degree for dorsiflexing the foot during ankle radiography?

80° to 85° (D) Signup and view all the answers

What is the proper part positioning for ankle radiography?

Centering and aligning the ankle joint to the image receptor without dorsiflexing the foot (B) Signup and view all the answers

What should be visible in an optimal exposure for ankle radiography?

Clear bony margins and trabecular markings, with visible soft tissue structures (C) Signup and view all the answers

What is the recommended shielding practice for ankle radiography?

Shielding of radiosensitive tissues outside the region of interest (B) Signup and view all the answers

Where should the central ray (CR) be directed for ankle radiography?

Midway between the malleoli (C) Signup and view all the answers

What may the appearance of an open lateral portion of the ankle joint on a true AP projection suggest?

Ruptured ligaments (D) Signup and view all the answers

What angle should the CR be directed for the CR Direct CR inferosuperiorly projection?

10° to 15° angle from lower legs (A) Signup and view all the answers

What is the major advantage of the CR Direct CR inferosuperiorly method?

Does not require special equipment (A) Signup and view all the answers

What is the recommended degree of knee flexion for the Hughston Method projection?

55° (A) Signup and view all the answers

What is the major disadvantage of the Hughston Method projection?

Requires prone position, which is difficult for some patients (C) Signup and view all the answers

What is the purpose of adjusting the rotation of the body and leg for the lateral knee projection?

To achieve a true lateral position (B) Signup and view all the answers

What is the recommended flexion degree for the knee in the lateral knee projection?

5° or 10° (C) Signup and view all the answers

What should the CR be directed to in the lateral knee projection?

Midfemoropatellar joint (C) Signup and view all the answers

What is the recommended collimation for the lateral knee projection?

Closely on four sides to include just the area of the patella and knee joint (C) Signup and view all the answers

What is the recommended minimum SID for the lateral knee projection?

40 inches (102 cm) (C) Signup and view all the answers

What is the recommended IR size for the lateral knee projection?

18 × 24cm (8 × 10 inches), 24 L lengthwise (A) Signup and view all the answers

What should be the patient's position for the lateral knee projection?

Lateral recumbent position, affected side down (A) Signup and view all the answers

What is the purpose of the 18 from lateral knee technique?

To avoid overexposing the patella (D) Signup and view all the answers

What is the recommended degree of knee flexion for the Settegast Method?

90° (B) Signup and view all the answers

What is the recommended minimum source-to-image distance (SID) for the Inferosuperior Projection?

40 inches (A) Signup and view all the answers

What is the purpose of the Hobbs Modification SuperoInferior Tangential Method?

To visualize the patellae and femoropatellar joints (C) Signup and view all the answers

What is the recommended IR size for the Inferosuperior Projection?

35 × 43 cm (B) Signup and view all the answers

What is the major advantage of the Hughston Method projection?

Reduced patient discomfort (D) Signup and view all the answers

What is the recommended kV range for digital systems during the Settegast Method?

70 to 80 kV (B) Signup and view all the answers

What is the patient position for the Hobbs Modification SuperoInferior Tangential Method?

Sitting (D) Signup and view all the answers

What is the recommended IR size for the Hughston Method?

35 × 43 cm (D) Signup and view all the answers

What is the recommended SID for the Settegast Method?

40 to 48 inches (A) Signup and view all the answers

What is the purpose of using sandbags and tape in the Inferosuperior Projection?

To stabilize the IR (C) Signup and view all the answers

What is the recommended degree of knee flexion for the Inferosuperior Projection?

40° to 45° (C) Signup and view all the answers

What is the recommended IR size for the Settegast Method?

35 × 43 cm (A) Signup and view all the answers

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.