Principles of projection l Oral radiology 4th year MCQs for dental students

 Principles of projection of x-ray l Oral radiology 4th year MCQs for dental students

MCQ on principles of projection for dental x-ray

The goal of taking dental radiographs is to record the image of the teeth and surrounding structures so that they are

a. Accurate

b. Free from distortion

c. Correctly proportioned

d. All of the above

The rule which has to be taken into account for image formation is

a. Source distance should be as long as possible.

b. Object and film should be parallel to each other.

c. Source of radiation should be as small as possible.

d. All of the above.

The degree with which how well a radiograph records separate objects that are close together is called

a. Image sharpness

b. Image resolution

c. Image size distortion

d. Image shape distortion

Increasing distance between focal spot and object causes

a. Increase in image sharpness and resolution

b. Decrease in image sharpness and resolution

c. Increase in image size distortion

d. All of the above

If film is not placed parallel to object and the central ray is perpendicular to object only, the type of dimensional distortion seen is

a. Elongation

b. Overlapping

c. Foreshortening

d. None of the above

If insufficient vertical angulation of central rays of beam is used than 90°, the resultant image will

a. Increase in size than the actual size

b. Decrease in size than the actual size

c. Be the same as the actual size

d. None of the above

Improper horizontal angulation leads to which type of distortion?

a. Foreshortening

b. Elongation

c. Overlapping

d. None of the above

Which of the following rules of shadow casting are followed in bisecting angle technique?

a. Rule 1

b. Rule 2

c. Rule 3

d. Both a and b

Rule 3 of shadow casting is followed in which type of radiographic technique?

a. Parallel line angle technique

b. Bisecting line angle technique

c. Both a and b

d. None of the above

Divergence of the rays is reduced by

a. Increasing distance between focal spot and object

b. Decreasing distance between focal spot and object

c. Increasing distance between object and film

d. None of the above