MEDICINE
RADIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The film should be parallel to the object.
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The target-to-fllm distance should be long.
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The object-to-fllm distance should be short.
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The central ray should be parallel to the object
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The central ray should be perpendicular to the film.
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Detailed explanation-1: -The parallel technique is defined as the parallelism between the object to be studied and the plane of the film while the central axis of the X-ray is perpendicularly adjusted to both planes. Unfortunately, it is much easier to get a perpendicular position of the X-ray central axis to the film than to the object.
Detailed explanation-2: -Principle Four: The Receptor and Long Axis of the Tooth Should be Parallel to Each Other. When the receptor and the long axis of the tooth are parallel to each other (as in the paralleling technique), the distortion of the radiographic image is decreased.
Detailed explanation-3: -There are two types of techniques used for periapical radiographs: bisecting angle, and paralleling.
Detailed explanation-4: -Intraoral images can be divided into three categories: (1) periapical projections, (2) bitewing projections, and (3) occlusal projections. Periapical radiographs should show all of a tooth, including the surrounding bone. Bitewing images show only the crowns of teeth and the adjacent alveolar crests.