Which of these statements regarding the focal trough is false?
A) Its shape varies from one manufacturer to another.
B) It is where structures will be imaged the sharpest.
C) It is two dimensional.
D) It is used to determine where to position the dental arches.
C
Explanation: A) The focal trough is three dimensional: anterior-posterior, left-right, and up-down.
B) The focal trough is three dimensional: anterior-posterior, left-right, and up-down.
C) The focal trough is three dimensional: anterior-posterior, left-right, and up-down.
D) The focal trough is three dimensional: anterior-posterior, left-right, and up-down.
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