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29 Cards in this Set
- Front
- Back
What is the purpose of extraoral imaging? |
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What are other reasons for extraoral radiography? |
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What do orthodontists use extraoral radographs for? |
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What do Prosthodotists use extraoral radographs for? |
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What do oral surgeons use extraoral radographs for? |
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What are the types of Extraoral Radiographs of the Maxillofacial Region? |
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Which EO Radiograph is this? What does it examine? |
- Body and ramus - Coronoid process - Condyle |
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Which EO Radiograph is this? What does it examine? |
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Why is a screen film used in conjunction with intensifying screens? |
to maintain low dosage |
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How must extra oral films be handled? |
carefully, without plastic or latex gloves (cause static), on the edges (cause finger prints), in appropriate lighting because (not packaged separately so will ruin all films exposed to light) |
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What is the intensifying screen? what does it do? |
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What are the characteristics of the intensifying screens? |
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What does sensitivity and image sharpness depend on? |
- large crystals produce a less sharp image
-Thicker emulsion = faster speed screen = less radiation but also less sharp image
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How is the correct side of the film identified? |
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What should be checked for when inspecting the cassettes and screens? |
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What are grids? How are they used? What do they require? |
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What are exposure factors based on? |
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What are three types of new techonolgy? |
Tomography - Simultaneous movement of the x-ray source and the image receptor to image structures within a selected plane of tissue Computed tomography (CT scan) - Patient lies on a table with head in scanner x-ray beam rotates 360 degrees around the head Cone beam computed tomography - Patient seated or standing upright while machine rotates around head |
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How many exposures does the Cone Beam Computed Tomography expose within the 360 degrees? What does the computer created from the images? What are the images for? |
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What is the Cone beam computed tomography? What does it acquire and how? |
x-rays taken with a cone-shaped x-ray beam acquires 3-D information by the source of radiation rotating around the head of the patient |
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What are the various sizes of Field of view? |
Large medium and small |
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What are the three planes of the body that the CBCT images? |
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What are advantages of the CBCT? |
- 42 mSv for maxilla and 75 mSv for mandible - pandoramic exposure is 7 mSv
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What are disadvantages of CBCT digital radiography? |
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