Panoramic Imaging
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Questions and Answers

Which type of imaging technique is used to examine the maxilla and mandible on a single projection?

  • Extraoral imaging
  • Panoramic imaging (correct)
  • Tomography
  • Intraoral imaging

    • Panoramic imaging should NOT be used to diagnose which of the following conditions?

  • Periodontal disease
  • Impacted teeth (correct)
  • Caries
  • Periapical lesions

    • What is the term used to describe the point around which the receptor and the x-ray tubehead rotate in panoramic imaging?

  • Pivotal point
  • Elliptical center
  • Rotation center (correct)
  • Axis point

    • Which part of the x-ray machine restricts the size and shape of the x-ray beam?

    <p>The collimator</p> Signup and view all the answers

    What is the purpose of the focal trough in panoramic imaging?

    <p>To generate a three-dimensional curved zone</p> Signup and view all the answers

    What color light does calcium tungstate emit?

    <p>Blue</p> Signup and view all the answers

    What should be assessed to determine the anatomic accuracy of a panoramic image?

    <p>The dentition and bones of the maxillofacial region</p> Signup and view all the answers

    Which of the following is a common error that can occur when taking a panoramic image?

    <p>Ghost image</p> Signup and view all the answers

    What can cause a lead apron artifact in a panoramic image?

    <p>Incorrect placement of the lead apron</p> Signup and view all the answers

    What happens if the patient's chin is tipped up too high during a panoramic image?

    <p>The condyles may not be visible</p> Signup and view all the answers

    What can happen if the patient's teeth are positioned too far forward on the bite-block during a panoramic image?

    <p>Teeth appear blurred</p> Signup and view all the answers

    Which positioning error can cause the roots of the anterior teeth to appear cut off in a dental radiograph?

    <p>Positioning the patient with the anterior teeth aligned too far back on the bite-block</p> Signup and view all the answers

    What happens when the patient's head is turned slightly to one side and not centered on the bite-block during dental radiography?

    <p>The structures on one side appear larger than those on the other side</p> Signup and view all the answers

    What happens when the patient is slouched or not standing with the shoulders back during dental radiography?

    <p>The cervical spine appears as a radiopacity in the center of the image</p> Signup and view all the answers

    What are the disadvantages of panoramic imaging?

    <p>Image quality, focal trough limitations, and distortion</p> Signup and view all the answers

    Which of the following is NOT a purpose of panoramic imaging?

    <p>To diagnose caries and periodontal disease</p> Signup and view all the answers

    What is the purpose of tomography in panoramic imaging?

    <p>To blur the images of structures in other planes</p> Signup and view all the answers

    What is the rotation center in panoramic imaging?

    <p>The point where the receptor and the x-ray tubehead rotate</p> Signup and view all the answers

    Which type of screen film requires less x-ray exposure and is considered 'faster' in panoramic imaging?

    <p>Rare earth</p> Signup and view all the answers

    What is the purpose of the collimator in a panoramic x-ray machine?

    <p>To restrict the size and shape of the x-ray beam</p> Signup and view all the answers

    What is the function of the focal trough in panoramic imaging?

    <p>To generate a three-dimensional curved zone for clear demonstration of structures</p> Signup and view all the answers

    What is the purpose of the cassette in extraoral film-based panoramic imaging?

    <p>To hold the intensifying screens</p> Signup and view all the answers

    Which of the following errors can result from the patient's chin being tipped down too far during a panoramic image?

    <p>The hyoid bone forms a single widened line.</p> Signup and view all the answers

    What can cause a ghost image in a panoramic image?

    <p>An object located laterally, such as earrings.</p> Signup and view all the answers

    What is the common error that can occur if the patient's lips are not closed on the bite-block during a panoramic image?

    <p>A dark radiolucent shadow that obscures anterior teeth.</p> Signup and view all the answers

    What can happen if metallic or dense objects are not removed before exposing a panoramic receptor?

    <p>A ghost image that may obscure diagnostic information.</p> Signup and view all the answers

    Which of the following is a disadvantage of panoramic imaging?

    <p>Panoramic images are not as sharp as intraoral images.</p> Signup and view all the answers

    What can happen if the patient's teeth are aligned too far back on the bite-block during a panoramic image?

    <p>The roots of the anterior teeth may appear to be cut off.</p> Signup and view all the answers

    What can cause the cervical spine to appear as a radiopacity in the center of a panoramic image?

    <p>The patient's slouched posture.</p> Signup and view all the answers

    What is the purpose of the forehead support in dental radiography?

    <p>To prevent the patient from sliding forward on the bite-block.</p> Signup and view all the answers

    Which of the following is NOT a purpose of panoramic imaging?

    <p>To diagnose caries, periodontal disease, or periapical lesions</p> Signup and view all the answers

    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?

    <p>Tomography</p> Signup and view all the answers

    What is the purpose of the rotation center in panoramic imaging?

    <p>To conform the image layer to the shape of the dental arches</p> Signup and view all the answers

    Which type of screen film requires more x-ray exposure and is considered 'slower' in panoramic imaging?

    <p>Calcium tungstate</p> Signup and view all the answers

    What is the purpose of the collimator in an intraoral x-ray machine?

    <p>To restrict the size and shape of the x-ray beam</p> Signup and view all the answers

    What is the function of the focal trough in panoramic imaging?

    <p>To determine where the dental arches must be positioned for the sharpest image</p> Signup and view all the answers

    What is the purpose of tomography in panoramic imaging?

    <p>To focus on a specific layer of structures</p> Signup and view all the answers

    Which of the following errors can result from the patient's chin being tipped up too far during a panoramic image?

    <p>A loss of detail occurs in the maxillary incisor region.</p> Signup and view all the answers

    What can cause a dark radiolucent shadow that obscures anterior teeth in a panoramic image?

    <p>If the patient's lips are not closed on the bite-block.</p> Signup and view all the answers

    What can produce a ghost image in a panoramic image?

    <p>All of the above.</p> Signup and view all the answers

    What is the ideal contrast on a panoramic image?

    <p>The identification of the junction between enamel and dentin in the molar region.</p> Signup and view all the answers

    Which of the following errors can result in the appearance of blurred teeth on a dental radiograph?

    <p>Positioning the patient with the anterior teeth aligned too far back on the bite-block</p> Signup and view all the answers

    What happens if the patient's head is turned slightly to one side during a dental radiograph?

    <p>The structures on one side of the image appear closer to the receptor while the structures on the other side appear farther away</p> Signup and view all the answers

    What can cause the cervical spine to appear as a radiopacity in the center of a panoramic image?

    <p>Positioning the patient in a slouched or slumped posture</p> Signup and view all the answers

    What is a disadvantage of panoramic imaging?

    <p>The images seen on a panoramic image are not as sharp as images produced with intraoral projections</p> Signup and view all the answers

    Study Notes

    Panoramic Imaging

    • Panoramic imaging is used to examine the maxilla and mandible on a single projection.
    • Panoramic imaging should NOT be used to diagnose conditions requiring detailed imaging, such as caries or periodontal disease.
    • Rotation center is the point around which the receptor and the x-ray tubehead rotate in panoramic imaging.
    • Collimator restricts the size and shape of the x-ray beam.
    • Focal trough is a curved, three-dimensional zone where structures are in focus.
    • Calcium tungstate emits blue light.
    • Anatomic accuracy is assessed by evaluating the position of the condyles, the symmetry of the image, and the absence of distortion.
    • Common errors in panoramic imaging include improperly positioned chin, incorrect biteblock placement, head tilting, and incorrect patient positioning.
    • Lead apron artifact in a panoramic image can be caused by improper positioning of the apron or heavy metal objects.
    • Chin tipped up too high results in a distorted image, with the anterior teeth appearing elongated and the posterior teeth compressed.
    • Teeth positioned too far forward on the biteblock causes the anterior teeth to appear blurred and the posterior teeth to appear compressed.
    • Positioning error causing cut-off roots of anterior teeth: if the patient's head is tilted too low, the roots of the anterior teeth may appear cut off, creating a shadow on the image.
    • Head turned to one side leads to asymmetrical image, with one side being smaller than the other.
    • Slouching or incorrect posture results in distortion of the images especially of the mandibular structures.
    • Disadvantages of panoramic imaging: limited resolution, distortion, artifacts, and cannot replace intraoral radiographs for detailed examination.
    • Purpose of panoramic imaging is to visualize the entire dentition (teeth), TMJ (temporomandibular joint), sinuses, and supporting bone structures in a single image.
    • Tomography is used to blur images of structures outside the focal trough.
    • Tomography is utilized to create single, sharp images of specific structures.
    • Rotation center is the point around which the x-ray tubehead rotates in panoramic imaging.
    • Faster screen film requires less x-ray exposure.
    • Collimator in a panoramic x-ray machine shapes the x-ray beam and limits scatter radiation.
    • Focal trough is a curved area where structures will be in focus.
    • Cassette in extraoral film-based panoramic imaging holds the imaging film.
    • Chin tipped down too far results in an image where the mandibular incisors appear elongated and the posterior teeth appear compressed.
    • Ghost image in a panoramic image can be caused by patient movement during exposure, metal objects not removed, or improper positioning of the head, which creates an image of an object that is not present in the true anatomical position.
    • Lips not closed on the bite-block results in dark radiolucent shadow obscuring anterior teeth.
    • Metallic or dense objects not removed results in ghost images on the panoramic image.
    • Disadvantages of panoramic imaging: limited resolution, distortion, and artifacts.
    • Teeth aligned too far back on the bite-block causes the anterior teeth to appear compressed and the posterior teeth to appear elongated.
    • Cervical spine appearing as a radiopacity in the center of a panoramic image can be caused by incorrect head positioning or slouching posture.
    • Forehead support in dental radiography helps stabilize the patient's head, minimizing head movement during exposure.
    • Tomography is a technique that allows the imaging of one layer, or section, of the body, while blurring the images of structures in other planes.
    • Rotation center is the point around which the x-ray tubehead rotates in panoramic imaging.
    • Slower screen film requires more x-ray exposure.
    • Collimator in an intraoral x-ray machine restricts the size of the x-ray beam.
    • Focal trough in panoramic imaging is a curved area where structures will be in focus.
    • Tomography in panoramic imaging is mainly used to blur images of structures outside the focal trough, improving the sharpness of the target area.
    • Chin tipped up too far during a panoramic image results in an image where the posterior teeth appear elongated and the anterior teeth appear compressed.
    • Dark radiolucent shadow obscuring anterior teeth can be caused by the patient's lips not being closed on the bite-block, or by the use of metal objects in the mouth.
    • Ghost image in a panoramic image can be caused by objects not removed or improper positioning of the patient.
    • Ideal contrast on a panoramic image allows for visualization of all relevant structures and details.
    • Blurred teeth on a dental radiograph can be caused by patient movement, improper positioning, or technical errors during the exposure.
    • Head turned slightly to one side results in an asymmetrical image with distortion.
    • Cervical spine appearing as a radiopacity can be caused by incorrect head positioning during the exposure.
    • Disadvantages of panoramic imaging include limited resolution, distortion, and artifacts.

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    Radiology Lecture 7.docx

    Description

    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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