Panoramic Errors & Landmarks Quiz
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Questions and Answers

What are the two planes that should be parallel to the floor during panoramic imaging?

  • Frankfurt plane and the midsagittal plane (correct)
  • Horizontal plane and the midsagittal plane
  • Frankfurt plane and the occlusal plane
  • Midsagittal plane and the occlusal plane

What anatomical structure helps to determine how close the image is to the focal trough?

Canine Lines

What is the term used to describe when the chin is tilted upwards or downwards in panoramic x-ray?

  • Chin twisting
  • Head twisting
  • Chin tilting (correct)
  • Head tilting

Head tilting is when the head or patient is rotated off-center during the panoramic image exposure.

<p>False (B)</p> Signup and view all the answers

What error causes the patient's teeth to appear narrower or smaller on one side of the image?

<p>Head is positioned too far anteriorly (A)</p> Signup and view all the answers

Which error causes the patients teeth to be wider on one side?

<p>Head is positioned too far posteriorly (B)</p> Signup and view all the answers

Which of these errors causes the upper teeth to be cut off in the image?

<p>Chin is tilted upward (A)</p> Signup and view all the answers

When the chin is tilted downwards, the patient's mandibles appear in a V-shaped form and the lower teeth are magnified.

<p>True (A)</p> Signup and view all the answers

A ghost image error occurs when a metal object is left on the patient before the panoramic image.

<p>True (A)</p> Signup and view all the answers

Sometimes during panoramic imaging, the cervical spine appears superimposed over the upper teeth. What error causes this?

<p>Improper posture</p> Signup and view all the answers

Lead apron artifacts are shaped like a cone and do not usually reach the upper teeth.

<p>False (B)</p> Signup and view all the answers

Flashcards

Frankfurt plane alignment

The position of the Frankfurt plane relative to the floor, where it should be parallel to the floor.

Canine lines in cephalometric radiography

The line connecting the points where the upper and lower canines touch the biting block, revealing the arch curvature.

Chin tilt error in cephalometric radiography

The error occurs when the patient tilts their head forward or backward, resulting in a misaligned Frankfurt plane and an uneven image with blurred features.

Head positioned too far anteriorly in cephalometric radiography

The error occurs when the patient positions their chin too far forward, causing the anterior teeth to appear smaller and the S line to appear longer and blurry.

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Head positioned too far posteriorly in cephalometric radiography

The error occurs when the patient positions their chin too far backward, causing the anterior teeth to appear wider and the S line to appear blurry.

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Chin tilted downward error in cephalometric radiography

An error caused by tilting the head forward, resulting in a V-shaped mandible, blurred anterior teeth, and a shorter, wider S line.

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Chin tilted upward error in cephalometric radiography

An error caused by tilting the head backward, resulting in blurred upper anterior teeth, a wider S line, and potentially cut-off condyles.

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Improper chin support error in cephalometric radiography

The error caused by the patient not placing their chin on the chin rest, leading to a distorted image with features like the nasal cavity, maxillary sinus, and infra-orbital rim appearing prominent.

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Earrings artifact in cephalometric radiography

An error caused by a patient wearing earrings, resulting in a metal artifact that obscures anatomical structures and may create a ghost image.

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Improper tongue position error in cephalometric radiography

An error caused by the patient failing to elevate their tongue to the hard palate, resulting in a visible tongue radiolucency and superimposed teeth.

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Movement error in cephalometric radiography

An error caused by patient movement during imaging, resulting in a blurry image, step cuts, and superimposed structures.

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Metal artifact error in cephalometric radiography

An error caused by the presence of metal objects during imaging, resulting in a radio-opaque artifact that may appear as a ghost image.

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Lead apron artifact error in cephalometric radiography

An error caused by improper lead apron placement, creating a cone-shaped artifact at the midline.

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Cervical spine artifact error in cephalometric radiography

An error caused by an improper posture, resulting in a white radio-opacity artifact at the midline, superimposed over the anatomical structures.

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Head position in cephalometric radiography

The position of the head relative to the biting block determines the accuracy of the image.

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Cephalometric radiography

The cephalometric radiograph demonstrates the relationship between the patient's teeth and the facial bones.

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Midsagittal plane in cephalometric radiography

The midsagittal plane is a vertical plane that divides the body into right and left halves.

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Laser light alignment in cephalometric radiography

The laser light should be aligned with the midsagittal plane for accurate image acquisition.

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Biting block in cephalometric radiography

The biting block is a device used to position the patient's teeth during cephalometric radiography.

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S line in cephalometric radiography

The S line is a measurement on the cephalometric radiograph that represents the length of the lower face.

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Focal trough in cephalometric radiography

The focal trough is a specific area within the cephalostat machine where the X-ray beam can create a clear image.

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Maxillary sinuses in cephalometric radiography

The maxillary sinus are air-filled cavities in the upper jawbone.

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Nasal cavity in cephalometric radiography

The nasal cavity is the space inside the nose.

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Infra-orbital rim in cephalometric radiography

The infra-orbital rim is the bony structure below the eye.

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Condyles in cephalometric radiography

The condyles are the rounded prominences at the ends of the mandible.

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Superior condyle in cephalometric radiography

The superior condyle is the upper part of the condyle.

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Mandible in cephalometric radiography

The mandible is the lower jawbone.

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Ramus in cephalometric radiography

The ramus is the vertical part of the mandible.

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Inferior border of the mandible in cephalometric radiography

The inferior border of the mandible is the lower edge of the jawbone.

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Study Notes

Panoramic Errors & Landmarks

  • Positioning: Head seated on chin rest, laser light aligning with midsagittal plane and Frankfurt plane for floor reference. Canine lines determining arch curvature, but it doesn't show focal trough errors.

  • Technique Errors:

    • Chin tilt (up or down): Frankfurt plane not parallel to the floor.
    • Head twisting (rotation): One side magnified, blurred, and horizontal dimensions inaccurate.
    • Head tilt: One side higher than the opposite (may affect position of condyles, causing cut-offs). Arch and teeth not aligned in the focal trough.

Other Errors & Causes

  • Head Position (Anterior/Posterior): Too far anterior/posterior can cause teeth seeming smaller or wider, blurry, out of focal trough, and close to the cassette.

  • Chin Tilt (Downward): V-shaped mandible, exaggerated smile lines, lower anterior teeth blurred and magnified (out of focal trough), and upper teeth cut off on the image.

  • Chin Tilt (Upward): Head tilted backward, square-shaped mandible, reverse smile, blurred upper and posterior teeth, condyles cut off.

  • Improper Chin Support: Pt doesn't place chin on chin rest affecting infraorbital rim, nasal cavity, and maxillary sinus.

  • Pt Wearing Earrings: Foreign body artifact obscuring anatomical structures.

  • Improper Tongue Position: Tongue superimposed on upper teeth apices.

  • Image Movement: Image not still during imaging causes blurry image, step cut at jaw bone, inferior border superimposes structures.

  • Ghost Image: Metal objects not removed cause radio-opaque artifacts to appear as real objects, with blurred magnified images at higher levels on the opposite.

  • Lead Apron Artifacts: Improper placement of the lead apron causing cone-shaped artifacts.

  • Improper Posture: Crooked back causes white radio-opacity on the midline, and teeth/bones appearing superimposed.

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Related Documents

Panoramic Errors & Landmarks PDF

Description

Test your knowledge of panoramic radiography, focusing on common errors and landmarks involved in positioning. This quiz covers techniques for accurate imaging and the consequences of improper head positioning. Enhance your understanding of how chin tilt and head rotation can affect image quality.

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