Chest and lower Limb projections

Question 1

Standard CXR projections

Answer 1

PA

Lateral

Question 2

PA CXR positioning

Answer 2

Hands on hips or around bucky and rotate
shoulders forward, chin slightly raised
Shoulders rolled forward
Align midsagittal plane to center of bucky
• Expose on inspiration
Imaging plate 3cm above AC joints
Central ray perpendicular to imaging plate
kVp 110 (range 100-120)
• mAs 2-10 or AEC two lateral chambers
• Broad focus, grid

Question 3

FFD for CXR

Answer 3

180cm

Question 4

What additional modifications have to be done to the xray tube during a semi erect PA CXR?

Answer 4

Angle beam DOWN so that beam is parallel with sternum

Question 5

Key positioning points for lateral CXR

Answer 5

LEFT side in contact with imaging plate
Hands above head
Slight lean outwards
chin up

110
15-30 or AEC central chamber

Question 6

Standard Toe (2-5) projections

Answer 6

AP
AP Internal Oblique
Lateral (if possible)

Question 7

Standard big toe projections

Answer 7

AP
AP internal oblique
Lateral

Question 8

Positioning for toe (2-5) AP

Answer 8

15 deg angulation of beam towards patients heel
C: 3rd MTP joint
42
2

Question 9

Positioning for toes (2-5) AP internal oblique

Answer 9

Internal aspect of foot in contact with imagining plate
C: 3rd MTP joint
42
2

Question 10

Lateral big toe positioning

Answer 10

Medial aspect of foot and big toe in contact with imaging plate

C: 1st MTP joint
kVp 45
• mAs 2

Question 11

Standard foot projections

Answer 11

AP
AP internal Oblique
Lateral (for orthopaedic devices, # and foreign body localisation)

Question 12

AP foot positioning

Answer 12

15 deg angulation of beam towards patients heel
C: base of 3rd MT
55
2.5

Question 13

AP internal oblique foot positioning

Answer 13

Medial aspect of foot in contact with imaging plate, 45 deg rotation of leg and foot.
C: base of 3rd MT
55
2.5

Question 14

Lateral foot positioning

Answer 14

ankle flexed at 90 degree
slight elevation of knee
C: base of MT
60
3.2