Radiology Exam Qs

Question 1

What are some properties of ghost images?

Answer 1

Higher due to beam angulation
Distorted
Appear on the opposing side on the radiograph

Question 2

What is the beam angulation on OPT

Answer 2

8 degrees

Question 3

What are some examples of ghost images?

Answer 3

Earings
hyoid bone 
soft palate 
dentures and fixed appliances 
Soft tissue calcification 
Metal restorations

Question 4

What are some indications for an OPT?

Answer 4

When you want to see the whole dentition and surrounding structures.
Ortho to see tooth development.
perio - give an idea of bone levels.
Person cant tolerate intra-oral radiographs.
TMJ evaluation 
Fractures and trauma 
Large lesions 
Developmental and acquired anomalies

Question 5

What are X-rays in terms of electrons and how is the image created?

Answer 5

X-rays are produced when fast-moving electrons are slowed rapidly.
X-ray source then interacts with the object (jaw and teeth) to create an image which is then processed by a computer to create an image.

Question 6

What is the size of the rectangular collimator used (diameter)?

Answer 6

60mm with a spacer cone

Question 7

How can you reduce the dose with X-rays?

Answer 7

Used rectangular collimation instead of circular (30%reduction)
High tube kVp
Reducing the area exposed

Question 8

What type of radiograph should be used to see retained roots?

Answer 8

OPT

Periapical

Question 9

How happens to the image on a radiograph if the patient is too close to the source?

Answer 9

The image will be magnified horizontally and vice versa