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Rad Positioning > Lumbosacral and Full Spine > Flashcards

Lumbosacral and Full Spine Flashcards

1
Q

Why should the patient exhale?

A

elevates the diaphragm

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2
Q

Which lumbosacral/full spine views require shielding of the gonads?

A

APLP and AP Full Spine only

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3
Q

Would “fluffy” patients take better films standing or recumbent?

A

recumbent (fat spreads out)

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4
Q

When MUST a lumbar film be taken recumbent?

A

when ruling out fracture

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5
Q

Where is the center of the lumbo-pelvic area? center of the lumbar spine?

A

below the iliac crest;

above crest

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6
Q

What films are centered on the lumbar spine rather than the lumbo-pelvic area?

A

laterals and obliques

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7
Q

Where do you measure (on the patient) before taking an APLP?

A

anterior to posterior at THICKEST part of abdomen

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8
Q

Film size for APLP?
CR for APLP?
What anatomy should be included in the light field?

A

14x17;
1” below crest for females, 2”below crest for males;
1” below ischial tubes, 1”below xiphoid (L1-Tubes)

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9
Q

Shields:
Who gets a heart?
Who gets the bell?

A

Girls get hearts,

Boys get bells

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10
Q

Ideally, where should the shield be for males?

A

1.5” below top of symphysis (just below pubic arch)

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11
Q

Ideally, where should the shield be for females?

A

bottom tip just above pubic symphysis

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12
Q

Why would you palpate both ischial tubes while placing your patient?

A

in case they had differing leg lengths

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13
Q

What do you do if L1 i clipped? If ischial tubes are clipped?

A

take a separate AP shot of L1;

move film and CR down and reshoot

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14
Q

T/F: it’s ok if the male shied overlaps the top of the symphysis or bottom of the ischial tubes.

A

False, not ok

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15
Q

CR for lateral lumbar?
collimation?
film size?

A

1” above crest, midaxillary;
10x17;
14x17

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16
Q

If the patient has a lateral lumbar curve, which side do you place next to the bucky?

A

convex side

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17
Q

For patients with hips larger than waist what should be filtered when taking lateral lumbar?

A

filter down to crest

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18
Q

T/F: Sacrum is included in lateral lumbar films.

A

false; at least not all of sacrum

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19
Q

collimation for lateral lumbar?

A

collimate into part size

20
Q

Where do you measure for a L5-S1 (lateral) spot films

A

2-3” below crest

21
Q

Film size for L5-S1 lateral spot film? CR? Collimation?

A

10x12;
2-3” below crest, 1” posterior to midline;
8x10

22
Q

Film size for anterior oblique lumbars? patient rotation for upper lumbars? for lower lumbars?

A

1012;
45 degrees for uppers;
30 degrees for lowers

23
Q

T/F: RAO=left pars and LAO= right pars

A

True

Remember CAOS?

24
Q

CR for RAO?

A

1”above crest and 1” lateral to spine toward the left side of the patient (looking at left pars with RAO)

25
Q

How much less mAs is needed for a recumbent anterior oblique as opposed to the standing?

A

30% less mAs

26
Q

For an RPO (looking at right pars), what part of the patient should be touching the bucky (or closest to it)?

A

right posterior side

27
Q

film size for posterior obliques? patient rotation? CR?

A

10x12;
30-45 degree;
Cr 1” above crest, ~2” medial to ASIS closest to the tube

28
Q

Why are anterior obliques preferred over posterior obliques?

A

less exposure and shoots into the natural curvature of the spine

29
Q

Should you see the IVFs on a posterior oblique? anterior oblique?

A

neither

30
Q

What views do we take of the Sacrum?

A

AP Sacrum and Lateral Sacrum

31
Q

Where do you measure for an AP Sacrum?

A

A-P mid-way between ASIS and PS (mid pelvis)

32
Q

Tube tilt for AP Sacrum?

A

15 degree cephalic

33
Q

Film size for AP sacrum?
CR?
Breathing instructions?

A

10x12;
2” below ASIS (mid pelvis);
Don’t breathe, don’t move

34
Q

Film size for Lateral Sacrum?

CR?

A

10x12;

3” below crest and 1” posterior to mid-axillary plane

35
Q

Why do we center posterior to mid-axillary plane for lateral sacrum?

A

sacrum is posterior to the rest of spine

36
Q

Views for Coccyx?

A

AP coccyx and Lateral coccyx

37
Q

Film size for AP Coccyx?
tube tilt?
CR?
Collimation?

A

10x12;
10 degrees caudal;
mid pelvis;
part size (4x4)

38
Q

Film size for Lateral Coccyx?
CR?
collimation?

A

10x12;
2” posterior to greater trochanter;
collimate to part size

39
Q

When taking a Sacrum/Coccyx Combo, ow would you get a 2 for 1?

A

load cassette with 2 films,
filter coccyx, OR
adjust image digitally

40
Q

film size for AP Full Spine?
Patient positioning?
Collimation?

A

14x36;
back to bucky, arms abducted, upper occlusal plane parallel to floor;
collimate just below the eyes and 3”below pubic symphysis, and 14” wide

41
Q

SID for AP Full Spine?
Mouth open or closed?
filter?
breathing instructions?

A

72”;
can be open OR closed;
filter upper thoracics down to axilla;
inhale and hold

42
Q

What 5 views make up the series when taking a Full Spine view?

A 
AP 14x36,
APOM,
Lat C-spine,
Lat T-spine, 
Lat L-spine
43
Q

How many views are needed to do a full sectional series (without doing an AP full spine)? What are they?

A 
7;
AP C-spine,
APOM,
Lat C,
AP T,
Lat T,
APLP,
Lat L
44
Q

Collimation for APLP?
Lateral Lumbar?
L5S1 Spot?
AP Sacrum?

A

14x17;
10x17;
8x10;
10x12

45
Q

T/F: LAO/RPO=left pars

A

False; LAO/RPO=right pars

RAO/LPO=left pars

Rad Positioning (2 decks)

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