Exam 6: Image Analysis of the Lower Extremity

For a 15- to 20-degree internally rotated AP oblique ankle projection, the 1)central ray is centered at the level of the medial malleolus. 2)foot is dorsiflexed to a 90-degree angle with the lower leg. 3)long axis of the lower leg is aligned with the long axis of the collimated field. 4)leg is internally rotated until the intermalleolar line is parallel with the IR.

For an AP ankle projection, the 1)intermalleolar line is aligned at a 15- to 20-degree angle with the IR. 2)lateral malleolus is positioned more posterior than the medial malleolus. 3)long axis of the foot is positioned perpendicular to the IR. 4)central ray is centered at the level of the medial malleolus.

An AP knee projection obtained with the central ray angled too cephalically demonstrates 1)symmetrical femoral condyles. 2)a foreshortened fibular head. 3)the fibular head at a position less than 0.5 inch (1 cm) distal to the tibial plateau. 4)a narrowed or closed femorotibial joint space.

An AP oblique foot projection with accurate positioning demonstrates 1)open first and second intermetatarsal joint spaces. 2)open joint spaces around the cuboid. 3)slight superimposition of the fourth and fifth metatarsal bases. 4)the long axis of the foot aligned with the long axis of the collimated field.

A less than optimal lateral knee projection that demonstrates the medial femoral condyle anterior to the lateral femoral condyle will also demonstrate

An optimal mortise (15- to 20-degree) AP oblique ankle projection demonstrates the

A lateral knee projection obtained with the patella positioned too close to the IR (leg externally rotated) will demonstrate the 1)fibula with increased tibial superimposition. 2)fibula with decreased tibial superimposition. 3)medial femoral condyle anterior to the lateral femoral condyle. 4)medial condyle distal to the lateral femoral condyle.

The placement of the patella in relationship to the femorotibial joint space on an AP knee projection is affected by 1)patellar subluxation. 2)knee rotation. 3)knee flexion. 4)foot inversion.

A less than optimal AP oblique foot projection demonstrates closed lateral cuneiform-cuboid, navicular-cuboid, and third through fifth intermetatarsal joint spaces. The fourth metatarsal tubercle is demonstrated without fifth metatarsal superimposition. Which of the following is true?

Which of the following positioning setup procedures must be completed to obtain open tarsometatarsal and navicular-cuneiform joint spaces on an AP axial foot projection? 1)The patient's foot is positioned flat against the IR. 2)The foot, ankle, and lower leg are aligned. 3)The central ray is angled 10 to 15 degrees proximally. 4)A compensating filter is placed over the toes.

A poorly positioned AP knee projection demonstrating a larger lateral femoral condyle than medial condyle

A lateral knee projection with accurate positioning demonstrates 1)superimposed femoral condyles. 2)the fibular head without tibial superimposition. 3)an open femorotibial joint space. 4)one-fourth of the distal femur and proximal lower leg.

On a lateral foot projection with accurate positioning, the 1)medial talar dome is demonstrated slightly superior to the lateral dome. 2)tibiotalar joint space is open. 3)talar domes are superimposed. 4)distal fibula is superimposed by the posterior half of the distal tibia.

What joint spaces are open on an AP oblique foot projection with accurate positioning? 1)Second through fifth intermetatarsal joints 2)Navicular-cuneiform 3)Joint spaces surrounding the cuboid 4)Tarsometatarsal

An axial calcaneus projection with the patient's foot in plantar flexion and the central ray angled 40 degrees proximally demonstrates a(n) 1)elongated calcaneal tuberosity. 2)foreshortened calcaneal tuberosity. 3)open talocalcaneal joint space. 4)closed talocalcaneal joint space.

A 15- to 20-degree internally rotated AP oblique ankle projection with accurate positioning demonstrates which of the following joints as open spaces? 1)Tibiotalar 2)Talofibular 3)Lateral mortise 4)Medial mortise

A less than optimal axial calcaneus projection demonstrates an obscured talocalcaneal joint space and an elongated calcaneus tuberosity. The projection was obtained with the

A 5- to 7-degree central ray angulation is used for a lateral knee projection 1)to project the medial condyle anterosuperiorly. 2)on a patient with a narrow pelvis and long femora. 3)to offset the reduction in medial inclination that occurs when the patient is in a lateral recumbent position. 4)to achieve an open femorotibial joint space.

For a lateral ankle projection, the 1)medial and lateral malleoli are positioned directly on top of each other. 2)lateral foot surface is aligned parallel with the IR. 3)lower leg is parallel with the imaging table. 4)central ray is centered to the medial malleolus.

An AP first toe projection that was obtained with the foot and toe rotated 45 degrees medially demonstrates 1)equal soft tissue width on both sides of each of the phalanges. 2)more midshaft concavity on one side of the phalanges than on the opposite side. 3)twice as much soft tissue on one side of the phalanges as on the opposite side. 4)convexity on one side of the phalanges and concavity on the opposite side.