positioning/scan parameters

Question 1

what is the patient position for the T-spine

Answer 1

Feet first , Supine, Sponge under knees for comfort
* Arms raised over head

Question 2

where are the lasers lined up for the t-spine

Answer 2

Internal laser: 2” above jugular notch (T1)
* Coronal laser: Mid coronal plane
* Sagittal laser: Mid sagittal plane

Question 3

whats the DFOV for a CT of the T-spine

Answer 3

DFOV: ∼16 cm (include transverse & spinous processes)

Question 4

when setting up the scanograms where are the start and end points that need to be included for the T-spine

Answer 4

Start location: Just above T1
* End location: Just below T12 (unless a level is specified)

Question 5

what is the patient position for a CT scan of the L-spine

Answer 5

Feet first , Supine, Sponge under knees for comfort
* Arms raised over head

Question 6

where are the laseres located for the Ct of the L-spine

Answer 6

Internal laser: Xiphoid (T9/T10)
* Coronal laser: Mid coronal plane
* Sagittal laser: Mid sagittal plane

Question 7

what is the DFOV for the L-spine

Answer 7

DFOV: 14-16 cm (Sideways include sacroiliac joints)

Question 8

when setting up the scouts for the L-spine where are the start and end points

Answer 8

Start location: Just above L1
* End location: Mid sacrum just below SIJ (unless a level is specified)

Question 9

what’s the patient position for a CT of the c-spine

Answer 9

• Patient position: Head first, Supine, Sponge under knees for comfort
• Use head scoop
  Ask patient to lower shoulders as much as possible

Question 10

where are the laseres located for a CT of the C-spine

Answer 10

Internal laser: Glabella
* Coronal laser: Mid neck / EAM
* Sagittal laser: Mid sagittal plane

Question 11

what is the DFOV for the C-spine

Answer 11

• DFOV: ∼14cm (Include transverse & spinous processes)

Question 12

when creating the scouts where are the starting and stopping points for the c-spine

Answer 12

Start location: Just above skull base
* End location: Mid T1 (include all C-spine vertebrae, unless a level is
specified)

Question 13

what is the patient position for a C+ scan of the neck

Answer 13

: Head first, Supine, Sponge under knees for comfort
* Ask patient to lower shoulders as much as possible
* Extend neck slightly to position hard palate perpendicular to table

Question 14

where are the lasers located for a C+ scan of the neck

Answer 14

• Internal laser: Glabella
• Coronal laser: Mid neck
• Sagittal laser: Mid sagittal plane

Question 15

what are the breathing instruction for a C+ CT of the neck

Answer 15

• Breath hold: Hold your breath and don’t swallow

Question 16

whats the DFOV for a C+ scan of the neck

Answer 16

DFOV: 20-24cm (include all soft tissue & nose)

Question 17

when creating scouts for the soft tissue neck where is the start and end points

Answer 17

Start location: Mid orbit
* End location: Clavicular heads

Question 18

what is the IV contrast for the soft tissue neck

Answer 18

• IV contrast: 125mL at 2.0mL/s. Split bolus—1st injection 50 mL, 2-
  minute delay; 2nd injection 75mL
  In the lab use single bolus IV contrast injection: 125ml at 3ml/s &
  50ml saline start the scan after 40 sec delay

Question 19

what is the delay for the soft tissue of the neck

Answer 19

scans initiated 25sec after the start of the second injection (As
per Romans, different in practice)

Question 20

where are the lasers located for a C+ scan of the head

Answer 20

• External laser: Before advancing the patient in the gantry make sure the
  head is symmetric. use the interpupillary line / outer canthus of the eyes
• Dualscano: out 240 mm
• Internal laser: Chin / Mentum
• Coronal laser: EAM
• Sagittal laser: Mid sagittal plane
• Angle gantry parallel to the supraorbitomeatal line

Question 20

what’s the patient position for the C+ scan of the head

Answer 20

Head first, Supine, Sponge under knees for comfort

Question 21

whats the DFOV for a C+ scan of the head

Answer 21

DFOV: ∼23 cm

Question 22

when creating scouts where are the start and end points points for a C+ scan of the head

Answer 22

• Start location: Just below base of skull
• End location: Just above vertex

Question 23

what is the IV contrast for a C+ scan of the head

Answer 23

• IV contrast: 100 mL at 1.0 mL/s. Scan delay = 5 minutes

Question 24

whats the patient position for the facial bones

Answer 24

• Patient position: Head first, Supine, Sponge under knees for comfort

Question 25

where are the lasers for the CT of the sinuses

Answer 25

External laser: Before advancing the patient in the gantry make sure the
head is symmetric. use the interpupillary line / outer canthus of the eyes
* Dualscano out 240
* Internal laser: Just inferior to chin
* Coronal laser: EAM or midway between EAM and outer canthus
Sagittal laser: Mid sagittal plane
* Patient’s chin should be tucked down towards chest as far as
possible

Question 26

whats the DFOV for the facial bones

Answer 26

18cm

Question 27

when making the scout where are the starting and ending points for the facial bones

Answer 27

Start location: Just below mandible
* End location: Just above frontal sinus

Question 28

whats the patient position for the sinuses

Answer 28

Patient position: Head first, Supine, Sponge under knees for comfort

Question 29

where are the lasers for the sinuses

Answer 29

External laser: Before advancing the patient in the gantry make sure the
head is aligned to all required planes. Reference the interpupillary line / outer
canthus of the eyes.
* Internal laser: Chin / Mentum (orbitomeatal line parallel)
* Scanogram: Single Lat out240
* Coronal laser: EAM or midway between EAM and outer canthus
* Sagittal laser: Mid sagittal plane

Question 30

whats the DFOV for teh sinuses

Answer 30

• DFOV: 16-18 cm

Question 31

where is the start and end location for the helical scan of the sinuses

Answer 31

Helical scan (Transverse plane)
* Start location: Above frontal sinus
* End location: Below hard palate

Question 32

where is the start and end location for the axial scan of the sinuses

Answer 32

Axial scan (Direct coronal plane)
* Patient position: Headfirst prone
* Start location: Mid Sella
* End location: Through frontal sinus