LRA-220 FINAL REVIEW Flashcards
Where should the central ray be directed for a lateral calcaneus radiograph?
1 inch distal to the medial malleolus
Which projection is preferable for examining the fibular head of a fractured lower limb?
Medial oblique knee
A radiographic appearance of a well-circumscribed lucency within bones describes:
A bone cyst
How much central ray (CR) angulation (if any) should be used for an AP projection of the toes?
10-15 degrees towards the calcaneus (cephalic)
What is the routine to be performed for a study of the second toe?
- AP
- AP oblique with medial rotation
- Lateromedial projection
How much is the foot dorsiflexed with the tangential projection for the sesamoid bones if the CR remains perpendicular to the image receptor?
10-15 degrees from vertical
A lateral knee radiograph that is over rotated toward the image receptor can be recognized by which of the following?
The fibular head will appear less superimposed by the tibia then a true lateral
To properly visualize the joint spaces with the AP projection of the foot, the CR must be:
Perpendicular to the metatarsals
Which joint space should be open or almost open for a well-positioned AP oblique knee projection with medial rotation?
Proximal tibiofibular joint
Which position of the foot will best demonstrate the lateral (third) cuneiform?
AP oblique with medial rotation
Which joint surfaces of the ankle joint are open with an AP projection of the ankle?
Medial and superior
What is one advantage of the lateromedial projection of the foot?
The foot assumes a more true lateral position
Which joint surfaces of the ankle joint are open with an AP projection of the ankle?
Medial and superior
To ensure that both joints are included on an AP projection of the tibia and fibula on an adult, the technologist should:
Turn the image receptor diagonally
What is the major disadvantage of using 45° of flexion for the mediolateral projection of the knee?
Draws the patella into the intercondylar sulcus
What is the amount of abduction of the femurs recommended for an AP bilateral frog-leg projection?
40-45 degrees
Which of the following positions will best demonstrate signs of developmental dysplasia of the hip?
Bilateral frog leg method
A radiograph of a AP mortise projection of the ankle reveals that the lateral malleolus is slightly superimposed over the talus and the lateral joint space is not open. What is most likely the cause for this radiographic outcome?
Insufficient medial rotation of the foot and ankle
How much flexion of the knee is recommended for the lateral projection of the patella?
5-10 degrees or less
A radiograph of an AP pelvis reveals that the right iliac wing is foreshortened as compared with the left side. What specific positioning problem is present on this radiograph?
- The patient is rotated toward the left
- Left posterior oblique (LPO)
The medial Malleolus is located on which bone?
Tibia
The lateral malleolus is located on which bone?
Fibula
Which of the following projections of the ankle will best demonstrate the open joint space of the lateral aspect of the ankle joint?
AP Mortise Ankle
True or False: the foot must be force dorsiflexed so that the long axis of the foot is perpendicular to the image receptor for AP and Mortise projections of the ankle
False
True or false: a correctly positioned lateral ankle will demonstrate the lateral malleolus superimposed over the posterior half of the tibia
True
What CR angulation is required for the AP oblique projection of the foot?
0 degrees
A radiograph of an AP ankle projection reveals that the lateral joint space is not open (lateral malleolus is partially superimposed by the talus). The superior and medial joint spaces are open. What should the technologist do to correct this problem and improve the image?
Nothing; this is an acceptable image
When positioning for a tunnel view, what angle do I use on the tube?
10 degrees caudad
If the part of my patient is between 19-24 cm, what angle do I use on the tube?
0 degrees
True or false: when positioning for a lateral knee, one should flex the knee 50-60 degrees
False
If part of my patient is between 25 cm and above, what angle do I use on the tube?
5 degrees cephalic
What is the CR for an AP knee?
Half an inch (.5) below/distal to the apex of the patella
How much does one flex the knee for a Settegast method?
90 degrees
How much CR angulation to the long axis of the foot is required for the plantodorsal (axial) projection of the calcaneus?
40 degrees
Where is the CR placed for an AP Axial Calcaneus?
Base of the 3rd metatarsal
What is the angle on the tube for a lateral calcaneus?
0 degrees
Where do you center for an AP femur?
Midfemur
Which projection of the knee will best demonstrate the neck of the fibula without superimposition?
AP Oblique with medial rotation
What joint is considered to be immovable?
Synarthrodial
