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RADR1311 > LowerExtremity > Flashcards

LowerExtremity Flashcards

1
Q

What is the recommended SID for a AP projection of the digits of the lower extremity?

A

40”

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2
Q

For an AP projection of the digits of the lower extremity, where is the IR?

A

tabletop

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3
Q

What anatomy should be visualized on an AP projection of the digits of the lower extremity?

A

MTP joint, IP joints, distal metatarsal, soft tissue and bony trabeculation

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4
Q

What tube angle is recommended for an AP projection of the digits of the lower extremity when the area of concern is the joint spaces?

A

15* cephalic

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5
Q

What is the central ray position for AP projection of the digit of the lower extremity?

A

MTP joint of the affected digit

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6
Q

What 2 patient positions can be used when imaging the lower extremities?

A

sitting or lying

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7
Q

What degree of rotation is used for a medial oblique of the digits of the lower extremity?

A

30-45*

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8
Q

When performing a lateral digit radiograph what should be used to separate the affected digit from the other digits

A

tape

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9
Q

What is the central ray position for a lateral calcaneus radiograph?

A

1 inch distal to the medial malleolus

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10
Q

What anatomy should be visible in a diagnostic lateral calcaneus x-ray?

A

the entire calcaneus, including the ankle joint, adjacent tarsals, soft tissue and bony trabeculation

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11
Q

What is the correct tube angulation for a plantodorsal axial calcaneus radiograph?

A

40* cephalad

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12
Q

What motion should be used to flex the foot for a plantodorsal axial projection of the calcaneus?

A

dorsiflexion

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13
Q

What is the central ray position for a plantodorsal axial calcaneus image?

A

at the base of the 3rd metatarsal

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14
Q

What projection requires a 10* tube angulation toward the heel?

A

AP axial foot

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15
Q

Using a 10* cephalic angle for AP axial foot x-rays will allow the central ray to

A

be perpendicular to the metatarsal joint space

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16
Q

What is the position of the central ray for AP axial foot?

A

3rd metatarsal

17
Q

How many degrees should the patient’s foot be rotated for a medial oblique foot?

A

30*

18
Q

What is central ray position for medial oblique foot?

A

base of the 3rd metatarsal

19
Q

which projection for the foot requires tube angulation?

A

AP axial foot

20
Q

it is necessary to rotate the patient’s foot 30* medially for a medial oblique foot in order to….

A

reduce superimposition of the cuboid bone

21
Q

What is the central ray position for a lateral foot?

A

3rd metatarsal

22
Q

Name the anatomy demonstrated in an AP ankle

A

entire ankle joint, the medial and lateral malleoli, talus, open tibiotalar space, soft tissue, and bony trabecular detail

23
Q

For an AP mortise ankle, to what degree is the patient’s foot rotated?

A

15-20*

this allows for the intermalleolar plane to be parallel with the IR

24
Q

To what degree should a patient’s ankle be rotated for the medial oblique ankle?

A

45*

25
Q

What is entry point of the central ray for a lateral ankle?

A

medial malleolus

26
Q

In which ankle projection is the distal tibia superimposed over the distal fibula?

A

lateral ankle

27
Q

Where should the central ray be directed for an AP ankle?

A

midway between the malleoli

28
Q

What is the collimation for an AP tib/fib?

A

1” on either side of the tib/fib to include the knee and the ankle joint

29
Q

Where should the central ray be directed for an AP tib/fib?

A

midshaft of the tibia/fibula

30
Q

What anatomy is demonstrated on a diagnostic AP tib/fib?

A

tibia & fibula, femorotibial articulation, medial and lateral malleoli, soft tissue, and bony trabecular detail

31
Q

In what position is the foot placed to obtain an AP tib/fib?

A

dorsiflexion

32
Q

What anatomy is demonstrated on a lateral tib/fib?

A

lateral aspect of the tibia and fibula, superimposed femoral condyles, and medial malleolus

33
Q

What is the position of the IR for a lateral tib/fib?

A

diagonal to accommodate the length of the anatomy

34
Q

What is the recommended central ray angle for an AP knee?

A

varies based on pelvic measurement

<19cm: 3-5* caudad (thin pelvis)
19-24cm: 0*
>24cm: 3-5* cephalad (large pelvis)

35
Q

Where should the central ray be directed for an AP knee?

A

.5” below the apex of the patella

36
Q

What is the degree of rotation for medial oblique projections of the knee?

A

45*

37
Q

When performing a recumbent lateral projection of the knee, the patient’s knee should be:

A

flexed 20-30*

38
Q

Name the anatomy demonstrated on an AP knee

A

symmetric femoral and tibial condyles, patella superimposed over the distal femur, open femorotibial joint space

RADR1311 (3 decks)

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