45 Questions
Which type of imaging technique is used to examine the maxilla and mandible on a single projection?
Panoramic imaging
Panoramic imaging should NOT be used to diagnose which of the following conditions?
Impacted teeth
What is the term used to describe the point around which the receptor and the x-ray tubehead rotate in panoramic imaging?
Rotation center
Which part of the x-ray machine restricts the size and shape of the x-ray beam?
The collimator
What is the purpose of the focal trough in panoramic imaging?
To generate a three-dimensional curved zone
What color light does calcium tungstate emit?
Blue
What should be assessed to determine the anatomic accuracy of a panoramic image?
The dentition and bones of the maxillofacial region
Which of the following is a common error that can occur when taking a panoramic image?
Ghost image
What can cause a lead apron artifact in a panoramic image?
Incorrect placement of the lead apron
What happens if the patient's chin is tipped up too high during a panoramic image?
The condyles may not be visible
What can happen if the patient's teeth are positioned too far forward on the bite-block during a panoramic image?
Teeth appear blurred
Which positioning error can cause the roots of the anterior teeth to appear cut off in a dental radiograph?
Positioning the patient with the anterior teeth aligned too far back on the bite-block
What happens when the patient's head is turned slightly to one side and not centered on the bite-block during dental radiography?
The structures on one side appear larger than those on the other side
What happens when the patient is slouched or not standing with the shoulders back during dental radiography?
The cervical spine appears as a radiopacity in the center of the image
What are the disadvantages of panoramic imaging?
Image quality, focal trough limitations, and distortion
Which of the following is NOT a purpose of panoramic imaging?
To diagnose caries and periodontal disease
What is the purpose of tomography in panoramic imaging?
To blur the images of structures in other planes
What is the rotation center in panoramic imaging?
The point where the receptor and the x-ray tubehead rotate
Which type of screen film requires less x-ray exposure and is considered 'faster' in panoramic imaging?
Rare earth
What is the purpose of the collimator in a panoramic x-ray machine?
To restrict the size and shape of the x-ray beam
What is the function of the focal trough in panoramic imaging?
To generate a three-dimensional curved zone for clear demonstration of structures
What is the purpose of the cassette in extraoral film-based panoramic imaging?
To hold the intensifying screens
Which of the following errors can result from the patient's chin being tipped down too far during a panoramic image?
The hyoid bone forms a single widened line.
What can cause a ghost image in a panoramic image?
An object located laterally, such as earrings.
What is the common error that can occur if the patient's lips are not closed on the bite-block during a panoramic image?
A dark radiolucent shadow that obscures anterior teeth.
What can happen if metallic or dense objects are not removed before exposing a panoramic receptor?
A ghost image that may obscure diagnostic information.
Which of the following is a disadvantage of panoramic imaging?
Panoramic images are not as sharp as intraoral images.
What can happen if the patient's teeth are aligned too far back on the bite-block during a panoramic image?
The roots of the anterior teeth may appear to be cut off.
What can cause the cervical spine to appear as a radiopacity in the center of a panoramic image?
The patient's slouched posture.
What is the purpose of the forehead support in dental radiography?
To prevent the patient from sliding forward on the bite-block.
Which of the following is NOT a purpose of panoramic imaging?
To diagnose caries, periodontal disease, or periapical lesions
What is the term used to describe the imaging technique that allows the imaging of one layer, or section, of the body while blurring the images of structures in other planes?
Tomography
What is the purpose of the rotation center in panoramic imaging?
To conform the image layer to the shape of the dental arches
Which type of screen film requires more x-ray exposure and is considered 'slower' in panoramic imaging?
Calcium tungstate
What is the purpose of the collimator in an intraoral x-ray machine?
To restrict the size and shape of the x-ray beam
What is the function of the focal trough in panoramic imaging?
To determine where the dental arches must be positioned for the sharpest image
What is the purpose of tomography in panoramic imaging?
To focus on a specific layer of structures
Which of the following errors can result from the patient's chin being tipped up too far during a panoramic image?
A loss of detail occurs in the maxillary incisor region.
What can cause a dark radiolucent shadow that obscures anterior teeth in a panoramic image?
If the patient's lips are not closed on the bite-block.
What can produce a ghost image in a panoramic image?
All of the above.
What is the ideal contrast on a panoramic image?
The identification of the junction between enamel and dentin in the molar region.
Which of the following errors can result in the appearance of blurred teeth on a dental radiograph?
Positioning the patient with the anterior teeth aligned too far back on the bite-block
What happens if the patient's head is turned slightly to one side during a dental radiograph?
The structures on one side of the image appear closer to the receptor while the structures on the other side appear farther away
What can cause the cervical spine to appear as a radiopacity in the center of a panoramic image?
Positioning the patient in a slouched or slumped posture
What is a disadvantage of panoramic imaging?
The images seen on a panoramic image are not as sharp as images produced with intraoral projections
Test your knowledge on panoramic imaging and learn about the importance of proper contrast and common errors to avoid. Identify the ideal contrast for optimal identification of anatomic structures and understand the concept of ghost images.
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