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Dentistry > Radio Ch 15,22,25 > Flashcards

Radio Ch 15,22,25 Flashcards

1
Q

Analog image

A

Radiographic image produced by conventional film

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2
Q

Charge-coupled device (CCD)

A

Solid-state silicone chip detector that converts light or x-ray photons into an electrical charge or signal: in digital imaging, CCD is found in the sensor

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3
Q

Digital imaging

A

Filmless imaging system: a method of capturing an image using a sensor, breaking it into electronic pieces, and presenting and storing the image using a computer and related imaging software

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4
Q

Direct Digital imaging

A

Method of obtaining a digital image, in which an intraoral sensor is exposed to x-radiation to capture a dental image that can be viewed on a computer monitor

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5
Q

Indirect digital imaging

A

Method of obtaining a digital image, in which a sensor is scanned following exposure to x-radiation and then converted into a digital form that can be viewed on a computer monitor

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6
Q

Storage phosphor imaging

A

Method of obtaining a digital image in which the image is recorded on a phosphor coated plate and then placed into an electronic processor, where a laser scans the plate and produces an image on a computer monitor

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7
Q

Exposure times for digital imaging are how much less than conventional imaging

A

50 to 90% depending on speed of film

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8
Q

Digital subtraction

A

Reversing radiopaycity

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9
Q

Pixel

A

A discrete unit of info; a picture element

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10
Q

In digital imaging, the term used to describe the picture that is produced is radiograph

A

False

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11
Q

Digital imaging requires more x-radiation than conventional radiography

A

False

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12
Q

The x-radiation source used in most digital imaging systems is a conventional dental x-ray unit

A

True

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13
Q

Compared with film emulsion, the pixels used in digital imaging are structured in an orderly arrangement

A

True

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14
Q

All intraoral sensors can be heat sterilize after use

A

False

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15
Q

The preferred exposure method for intraoral digital imaging is the paralleling technique

A

True

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16
Q

One advantage of a digital imaging system is the superior grayscale resolution that results

A

True

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17
Q

Digital subtraction is an advantage in digital imaging because distracting background information is eliminated from the image

A

True

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18
Q

The manipulation of the original digital images can be considered a legal issue

A

True

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19
Q

When was digital imaging introduced to dentistry

A

1987

20
Q

What can digital imaging be used for

A

Detecting conditions of teeth and surrounding structures, evaluating the growth and development of jobs, confirmation of suspected disease

21
Q

Digital imaging require less radiation then does conventional radiography because

A

The sensor is more sensitive to x-ray

22
Q

The image receptor found in the intraoral sensor is termed what

A

CCD

23
Q

Digital imaging systems can be used for which images

A

Bitewing, panoramic, cephalometric

24
Q

All of the following are advantages of digital imaging except

A

Size of the intraoral sensor

25
Q

Which describes a use of panoramic image

A

Evaluation of impacted molars

26
Q

The zone in which structures are clearly demonstrated on a panoramic image is termed

A

Focal trough

27
Q

Rare earth intensifying screens are recommended in film based panoramic imaging because

A

Rare earth screens require less X-ray exposure for the patient

28
Q

A thyroid collar is not recommended in panoramic imaging because

A

It blocks the x-ray beam and obscures info

29
Q

Which imaginary plane passes from the bottom of the eye socket through the top of the ear canal

A

Frankfort

30
Q

Procedure for pano

A

Receptor/tubehead rotate around patient, examine extent of large lesion, arches aligned to focal trough, collimator is a lead plate w/ narrow vertical slit, head positioned, screen film used, cassette holder w/ 2 intensifying screens, film loaded in cassette in darkroom under safelight

31
Q

Procedure for intraoral imaging

A

Collimator lead plate w/ small round or rectangular opening, vertical angulation of tubehead variable,lead apron w/ thyroid collar

32
Q

Panoramic and intraoral imaging procedures

A

Tubehead contains filament used to produce electrons and a target used to protect X-rays, midsagittal plane perpendicular to floor

33
Q

Exposure to infectious materials that result from piercing or puncturing the skin

A

Parenteral exposure

34
Q

EPA registered chemical germicides labeled as both hospital disinfectant and tuberculocidal agents are classified as

A

Intermediate level disinfectants

35
Q

EPA registered chemical germicides labeled only as hospital disinfectants are classified as

A

Low-level disinfectants

36
Q

What happens when chin is tip down during pano

A

Exaggerated smile line

37
Q

What happens when teeth are positioned too far forward on bite block with pano

A

Anterior teeth appear narrowed and blurred

38
Q

What happens when chin is tipped up

A

Reverse smile line

39
Q

What happens if the patient doesn’t keep the tongue against the pallet

A

A radio Lucent shadow will be superimposed over the apices of maxillary teeth

40
Q

Area one

A

Dentition

41
Q

Area 2

A

Ramus and cervical spine

42
Q

Area three

A

Nasal cavity and maxillary sinus

43
Q

Area 4

A

Body of mandible

44
Q

Area five

A

Condyle

45
Q

Area six

A

Hyoid

46
Q

What happens when the patient’s teeth are too far back on the bite block

A

Anterior teeth appear widened and blurred

Dentistry (63 decks)

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