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DRG1004 > Week 12 - Thoracic & Lumbar Spines > Flashcards

Week 12 - Thoracic & Lumbar Spines Flashcards

1
Q

AP/PA target for Lumbar Spine

A

VCR along midline of patient, at level of LCM

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2
Q

AP/PA Lumbo-sacral spine target

A

VCR along MSP of patient, at level of iliac crests

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3
Q

AP/PA lumbar spine collimation

A

upper = xiphisternum
side = mid clavicular line
lower = midway between ASIS & SP

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4
Q

Lateral lumbar spine target

A

VCR at point 7.5 cm anterior to L3 spinous process

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5
Q

Lateral lumbo-sacral spine target

A

VCR at point 7.5 cm anterior to L3 spinous process

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6
Q

Lateral lumbar spine collimation

A

upper = level of xiphisternum
side = posterior to 2cm anterior to mid-coronal plane
lower = midway between ASIS & SP

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7
Q

ideal position of AP lumbar spine

A
  1. psoas muscles shown
  2. spinous processes aligned to midline of vertebral bodies
  3. equal distance between spinous processes & pedicles
  4. sacrum & coccyx centered within pelvis inlet
  5. vertebral bodies shown w/o distortion
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8
Q

ideal area of AP lumbar spine

A

T12 - L5, sacroiliac joints, sacrum, psoas muscles included

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9
Q

ideal position of lateral lumbar spine

A
  1. open intervertebral disk spaces
  2. vertebral bodies shown w/o distortion
  3. intervertebral foramina shown w/o overlaps
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10
Q

ideal area of lateral lumbar spine

A

T11 - L5, sacrum

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11
Q

AP sacrum target

A

VCR angled 10 to 25 degrees cranially along midline of patient at level between ASIS & superior border of SP

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12
Q

AP coccyx target

A

VCR angled 10 - 15 degrees caudally to midline of patient at point 2.5 cm superior to SP

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13
Q

AP sacrum collimation

A

upper = level of iliac crests
side = both ASIS
lower = level of SP

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14
Q

Lateral sacrum collimation

A

upper = level of ASIS
side = both ASIS
lower = level of SP

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15
Q

Lateral sacrum target

A

VCR along long axis of sacrum, at level midway between PSIS & sacro-coccygeal junction

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16
Q

Lateral coccyx target

A

VCR along long axis of sacrum towards, palpable coccyx

17
Q

lateral sacrum collimation

A

upper = iliac crest level
side = posterior skin margins to ASIS
lower = coccyx

18
Q

lateral coccyx collimation

A

upper = ASIS
side = posterior skin margins to ASIS
lower = 1cm below tip of coccyx

19
Q

ideal position of AP sacrum

A
  1. median sacral crest & coccyx aligned w/ SP
  2. S1 - S5 shown w/o foreshortening
  3. equal spacing between sacrum foramina
  4. SP not superimposed over any part of sacrum
20
Q

ideal area of AP sacrum

A

L5 - Co1, SP, sacroiliac joints

21
Q

ideal area of lateral sacrum

A

L5 - Co1, promontory included

22
Q

ideal position of AP coccyx

A
  1. coccyx aligned w/ SP
  2. coccyx is at equal distances from lateral walls of pelvis inlet
  3. Co1 to Co3 shown w/o foreshortening & SP superimposition
23
Q

ideal area of AP coccyx

A

S5 - Co3, SP, pelvic brim included

24
Q

ideal position of lateral coccyx

A
  1. median sacral crest shown
  2. greater sciatic notches superimposed
  3. coccyx shown w/o foreshortening
25
Q

ideal area of lateral coccyx

A

S5 - Co3, inferior median sacral crest included

26
Q

cassette size for lumbar spine

A

35 x 43

27
Q

kVp for lumbar spine

A

AP/PA = 75 - 90
lateral = 90 - 105
oblique = 75 - 90

28
Q

AEC for lumbar spine

A

centre

29
Q

cassette size for sacrum & coccyx

A

24 x 30 cm

30
Q

kVp for sacrum

A

AP = 75 - 90
lateral = 85 - 100

31
Q

kVp for coccyx

A

AP = 80 - 85
lateral = 85 - 90

32
Q

AEC for sacrum & coccyx

A

centre chamber

33
Q

SID for sacrum & coccyx

A

100 cm

34
Q

SID for lumbar

A

100 - 115 cm

35
Q

when is upright PA lumbar done

A

to reduce physical discomfort from doing supine

36
Q

why is prone > erect for PA lumbar spine

A
  1. better showcase of IV joints; less distortion
  2. more comfort
  3. lower dose to gonads
  4. compression of abdomen & SSTM = less scatter radiation

DRG1004 (12 decks)

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