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Rad Positioning - Spine > Lumbars and Such > Flashcards

Lumbars and Such Flashcards

1
Q

Where does the ID blocker go for the lumbosacral views?

A

UP (away from anatomy)

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2
Q

What are the breathing instructions for all lumbosacral views?

A

Exhale and hold

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3
Q

Why is the breathing instruction for lumbosacral views exhale and hold?

A

Expiration elevates the diaphragm to get it out of the way

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4
Q

Which has a center BELOW the iliac crest: lumbo-pelvic or lumbar spine?

A

Lumbo-pelvic

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5
Q

Which has a center ABOVE the iliac crest: lumbo-pelvic or lumbar spine?

A

Lumbar spine

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6
Q

Where is the caliper measurement for the AP lumbo-pelvic?

A

A-P at the THICKEST part of the abdomen

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7
Q

Where does the CR go for the AP lumbopelvic for both genders?

A

1 inch below crest for females, 2 inches below for males (due to pelvic girdle differences)

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8
Q

What anatomy must be present for the AP lumbopelvic film?

A

L1 to ischial tuberosities

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9
Q

Where should the bottom of the film be for the AP lumbopelvic film?

A

1 inch below ischial tuberosities or 3 inches below top of greater trochanter

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10
Q

Where should the male shield be placed for the AP lumbopelvic?

A

Just below pubic arch (1.5 inches below top of symphysis)

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11
Q

Where should the female shield be placed for the AP lumbopelvic?

A

Bottom tip (of heart) just superior to pubic symphysis and position widest part just medial and inferior to ASIS

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12
Q

What should you do if L1 gets clipped with an AP lumbopelvic film?

A

Separate L1 AP shot

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13
Q

What should you do if the ischial tuberosities get clipped with an AP lumbopelvic film?

A

Move film and CR down and take again

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14
Q

What two pieces of anatomy should be specifically checked for symmetry following an AP lumbopelvic film?

A

Iliac wings and obturator foramina

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15
Q

We must be careful to now allow the male shield to cover what pieces of anatomy in the AP lumbopelvic?

A

Symphysis or bottom of ischial tuberosities

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16
Q

Where does the CR go for a lateral lumbar?

A

1 inch ABOVE crest (around L3) and midway between ASIS and PSIS on midaxillary line

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17
Q

A shield is used for what lumbosacral views?

A

ONLY lumbopelvic (and AP full spine)

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18
Q

What is the collimation for a lateral lumbar film?

A

10x17

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19
Q

What do we do for a lateral lumbar when we have a patient with hips larger than the waist?

A

Add filter down to crest

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20
Q

If the patient presents with a global curvature, which side should go next to the bucky?

A

Side of convexity

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21
Q

What additional view should you take it L5/S1 is too light on a lateral lumbar?

A

Lateral L5/S1 spot shot

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22
Q

Where do we measure with calipers for a L5/S1 spot shot?

A

Right to left 2-3 inches BELOW crest

23
Q

What is the collimation for a L5/S1 spot shot?

A

8x10 (10x12 film size)

24
Q

Where does the CR go for a L5/S1 spot shot?

A

2-3 inches below crest and 1 inches posterior to midline

25
Q

What is the purpose of oblique lumbar films?

A

View pars

26
Q

What is the angle of rotation for anterior oblique lumbars?

A

45 for uppers and 30 for lowers

27
Q

What pars are being viewed with a RAO lumbar film?

A

LEFT

28
Q

What pars are being viewed with a LAO lumbar film?

A

RIGHT

29
Q

Where does the CR go for an anterior oblique lumbar film?

A

1 inch above crest and 1 inch lateral to spine toward side of interest (which pars you want to see)

30
Q

The CR would go to which side of the spine for a RAO? LAO?

A

RAO toward left side of spine; LAO toward right side of spine

31
Q

What is a benefit for recumbent anterior oblique lumbars?

A

Flattens out tissue therefore requiring 30% less mAs (McLean prefers these)

32
Q

What side touches the bucky with oblique lateral films?

A

Side of interest

33
Q

Where is the CR for a posterior lumbar oblique?

A

1 inch above the crest and 2 inches medial to ASIS closest to tube

34
Q

Why are anterior oblique lumbars preferred compared to the posteriors?

A

Less exposure to patient and also shooting into natural curvature

35
Q

On which lumbar view can we see IVFs?

A

Lateral (NOT OBLIQUES like the cervicals)

36
Q

Where is the CR for an AP sacrum view?

A

Perpendicular to sacrum with 15 degree cephalic tube tilt

37
Q

What is the purpose of the 15 degree cephalic tube tilt of the AP sacrum view?

A

Open and elongate sacrum

38
Q

Where is the CR for a lateral sacrum view?

A

3 inches below crest and 1 inch posterior to mid-axillary line

39
Q

Why does the CR need to be 1 inch posterior to the mix-axillary plane for sacral films?

A

Sacrum lies posterior to rest of spine

40
Q

What is the collimation for the AP coccyx?

A

4x4

41
Q

What is the tube tilt associated with the AP coccyx?

A

10 degree caudal tilt

42
Q

What is the CR for the lateral coccyx?

A

Center 2 inches posterior to greater trochanter

43
Q

What is the collimation for the lateral coccyx?

A

Collimate to part size

44
Q

Where does the ID blocker go for the AP full spine?

A

UP

45
Q

What cassette size is used for the AP full spine?

A

14x36

46
Q

What is the patient placement for the AP full spine?

A

Arms abducted against full-spine bucky

47
Q

What is the collimation for the AP full spine?

A

Open so it’s just below the eyes and 3 inches below the pubis symphysis (14 inches wide, of course)

48
Q

What is the SID for AP full spine?

A

72

49
Q

What is filtered with AP full spine view?

A

Upper thoracics down to axilla

50
Q

What are the breathing instructions for the AP full spine film?

A

Inhale and hold

51
Q

Which lumbosacral views have the CR above the crest? Below?

A 
Above = lateral and obliques
Below = AP and lateral L5/S1 spot
52
Q

What is the collimation for AP sacrum?

A

10x12

53
Q

What is the collimation for the APLP?

A

14x17

Rad Positioning - Spine (4 decks)

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