Extraoral Radiographic Techniques 1

Panoramic radiograph causes a higher radiation dose than full mouth x-rays

• True

• False

Magnification & distortion are major drawbacks of ...

• panorama

• periapical x-ray

• lateral cephalometric

• sialography

During positioning the patient to take a panoramic x-ray, the frankfurt horizontal plane is ... to the floor

• parallel

• perpendicular

• it doesn't matter

• none of the above

In Panoramic radiography, the x-ray tube and the film rotate in opposite directions

• True

• False

In panoramic x-ray, an object will be sharp displayed when the central beam moves on this object with the same linear speed as on the film

• True

• False

Three-dimensional curved zone or image layer in which structures are reasonably well defined

• Focal trough

• Digital radiography

• Biting fork

• Tomography

If the patient doesn't swallow during taking a panoramic x-ray, a ... will be evident

• maxillary sinus

• palatopharyngeal air space

• nasopharyngeal air space

• palatoglossal air space

1 panoramic image = ... intraoral images

• 14

• 16

• 5

• 3

Digital panorama reduces the radiation by...

• 15%

• 20%

• 25%

• 30%

On panoramic X-rays, the magnification coefficient depends on the distance between the ... and the ...

• sensor, object

• sensor, x-ray source

• object, x-ray source