Sacrum spine projections

Question 1

A.P Sacrum - positioning

Answer 1

Supine with legs extended

Question 2

A.P Sacrum - angle

Answer 2

15 degrees cephalad (towards the head)

Question 3

A.P Sacrum - CR

Answer 3

midway between the ASIS and the symphysis pubis

Question 4

A.P Sacrum - collimation

Answer 4

To the image receptor borders

Question 5

AP Coccyx - positioning

Answer 5

Supine with legs extended

Question 6

AP Coccyx - angle

Answer 6

15 degrees caudad (towards toes)

Question 7

AP Coccyx - CR

Answer 7

5cm superior to pubic symphysis

-soft tissue crease

Question 8

A.P coccyx - Collimation

Answer 8

10cm x 10cm area

Question 9

Lateral Sacrum and coccyx - positioning

Answer 9

on side

Question 10

Lateral Sacrum and coccyx - angle

Answer 10

Straight tube unless compensatory angulation needed.

Question 11

Lateral Sacrum and coccyx - CR

Answer 11

10cm posterior to ASIS (ILIAC CREST)

Question 12

Lateral Sacrum and coccyx - collimation

Answer 12

Full length, 15cm width

Question 13

OBLIQUE SACRO-ILIAC JOINT - positioning

Answer 13

Semi-supine, 15o oblique, target side raised.

Question 14

OBLIQUE SACRO-ILIAC JOINT - angle

Answer 14

Straight tube

Question 15

OBLIQUE SACRO-ILIAC JOINT - CR

Answer 15

5cm medial to elevated ASIS

Question 16

OBLIQUE SACRO-ILIAC JOINT - collimation

Answer 16

Full length, 10cm width

Question 17

what is the FOD for sacrum and coccyx

Answer 17

100cm

Question 18

exposure for sacral coccyx

Answer 18

AP sacrum
kVp 75 +/-5
mAs 20
AP Coccyx
kVp 75 +/-5
mAs 15
LATERAL SACRUM AND COCCYX
kVp 75 +/-5
mAs 50
OBLIQUE SACRO-ILIAC JOINT
kVp 75 +/-5
mAs 20