Rad chapter 17

Why is an increased target receptor distance required in a paralleling technique

• to avoid image magnification

• to avoid distortion

• to reduce scatter radiation

• to improve receptor placement

Which describes the relationship of the central ray to the receptor in the paralleling technique

• 20 degrees to the long axis of the tooth

• 90 degrees to the receptor and long axis of the tooth

• 75 degrees to the long axis of the toot

• 15 degrees to the receptor and long axis of the tooth

Which definition is incorrect?

• parallel: always separated by the same distance

• intersecting: to cut through

• right angle: formed by two parallel lines

• central ray: central portion of the xray beam

Which describes the relationship between the receptor and long axis of the tooth in the paralleling technique?

• The receptor and the tooth are parallel to each other

• The receptor and the tooth are at right angles to each other

• The receptor and the tooth are perpendicular to each other

• The receptor and the tooth are intersecting each other

Which describes the distance between the receptor and the tooth in the paralleling technique ?

• The receptor is placed as close as possible to the tooth

• The receptor is placed away from the tooth and toward the middle of the oral cavity

• either a or b

• none of the above

How are anterior receptors placed?

• Horizontally

• Vertically

How are posterior receptors placed?

• Horizontally

• Vertically

Which is incorrect?

• Anterior receptors are always exposed before posterior receptors

• Either anterior or posterior receptors may be exposed first

• in posterior quads, the premolar receptor is always exposed before the molar receptor

• when exposing anterior receptors, work from the patients right to left in the max arch, and then work from left to right in the mand arch

which is correct?

• if the lack of parallelism is greater than 30 degrees the image is generally acceptable

• if the lack of parallelism is less than 20 degrees the image is generally acceptable

• if the lack of parallelism is less than 50 degrees, the image is generally acceptable

• if the lack of parallelism is greater than 50 degrees the image is generally acceptable

True or false, the advantages of the paralleling technique outweighs the disadvantages?

• TRUE!!!!!

• FALSE!!!!!!!