Lab 4 Nasopharynx

Question 1

Energy?

Answer 1

6 MV

Question 2

Contours: (2)

Answer 2

Spinal Cord

Eyes

Question 3

Set up notes:

Answer 3

Supine, S-Frame /c C-HR & accuform, Mask, Jump Ropes @ D & E

Question 4

Scanning borders:
Sup -
Inf -

Answer 4

Sup - top of head

Inf - 5-6 cm below SSN

Question 5

Lateral Borders:

Anterior Border - 3 parts

Answer 5

Post 1/4 of orbit
Post 2 cm of nasal cavity/2 cm below tumor
Post 1/3 of maxillary sinus/midway through orbit

Question 6

Lateral Borders:

Superior Border -

Answer 6

0.5cm base of skull (includes the entire sphenoid sinus & cavernous sinus)

Question 7

Lateral Borders:

Posterior Border -

Answer 7

Behind the spinous process;
Most inferior spinous process C1-C2 (this includes retropharyngeal nodes, posterior pharyngeal wall, deep cervical nodes, or posterior cervical nodes)

Question 8

Lateral Borders:

Inferior Border -

Answer 8

Cricoid or junction of the larynx (look at Pixey’s mid neck)

Question 9

AP S/C Borders:

Superior Border -

Answer 9

Match line (the superior border of the S/C is the inferior border of the 
lateral fields)

Question 10

AP S/C Borders:

Inferior Border -

Answer 10

1 cm below clavicle

Question 11

AP S/C Borders:

Lateral Border -

Answer 11

2/3 of the clavicles

Question 12

Field order:

Answer 12

Rt Lat
Lt Lat
AP

Question 13

Steps for Rt Lat:

Answer 13

put iso at disc b/w C4 & C5; 1 cm ant to spinal cord contour
5.5 cm to the left
5.5 cm to the right
17 cm up
0 cm down

Question 14

Steps for Lt Lat:

Answer 14

Parallel oppose Rt Lat

Question 15

Steps for AP: (4)

- MLCs:

Answer 15

9 cm to the left
9 cm to the right
0 cm up
11 cm down
- MLCs: follow clavicles and block 1 cm below