Lateral Cephs Revision Questions

Question 1

What should the frankfort plane be

Answer 1

Horizontal

Question 2

Mid sagittal plane

Answer 2

Vertical and parallel ro casette - xrays beam perpendicular to patients sagittal plane, sagittal plane parallel to film, teeth in ICP

Question 3

Inter orbital/pupiallry line

Answer 3

Horizontal

Question 4

Orbito meatal line

Answer 4

radiographic baseline - runs from the outer canthus of the eye to the centre of the external audiotiry meatus

Question 5

Oblique lateral radiographs

Answer 5

the film and mid sagittal plane are not parallel

xray beam is not perpendicular to either

Question 6

Why not just use CBCTS

Answer 6

ALARP - cone beam x20 times radiation that PAs so better for patient, safe time and effort
Less expensive for patient
Need qualification for CBCT to perform on patient

Question 7

What are ghost images

Answer 7

second image of something in the wrong place

earrings, soft tissue, calcifications

Question 8

What are ghost images always

Answer 8

higher due to negative vertical beam angulation
horizontally projected and horizontally magnified
can interfere with diagnosis
changes in antero-posteior position
radiopaque (white) - caused by dense objects

Question 9

What is the safety controlled area

Answer 9

Controlled area where no one is standing while the xray is being taken
Intral orals - 1.5mm (2mm where workers stand)
CBCT - entire room controlled