OPG faults

Question 1

What radiographic fault can be seen if the patient is positioned too far in?

Answer 1

1. Teeth are too narrow and squashed.
   the image is further away
2. Premolars will overlap.
3. Cervical spine appears on the image (shouldn’t happen).

Question 2

What radiographic faults occur if the patient is positioned too far out?

Answer 2

1. Anterior teeth will be widened and blurred.
2. The image will miss out the condyles and TMJ.

Question 3

Which radiographic faults can be seen if the patient is positioned with their chin up?

Answer 3

1. The roots of the upper incisors will be blurred.
2. Condyles may be lost at the sides of the film.
3. The hard palate is projected over the upper rot apices.

SAD FACE

Question 4

Which radiographic faults may occur if the patient is positioned with their chin too far down?

Answer 4

1. The lower incisor roots will be blurred.
2. The hyoid bone will be projected over the mandible.

SMILEY FACE

Question 5

Which radiographic faults may be seen if the patient’s head is rotated?

Answer 5

1. The teeth on 1 side will be magnified and have overlapping contacts.
2. The width of the rami will be different.

Question 6

Which radiographic faults may be seen if the patient is slumped?

Answer 6

A ghost image of the CERVICAL SPINE is projected over the midline of the film.

Question 7

Where do ghost images appear?

Answer 7

On the opposite side from the real image.

Question 8

Why are ghost images higher up and blurred?

Answer 8

Because the beam goes up at an angle.