Radio Ch 15,22,25 Flashcards Preview

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Flashcards in Radio Ch 15,22,25 Deck (46):
1

Analog image

Radiographic image produced by conventional film

2

Charge-coupled device (CCD)

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

3

Digital imaging

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

4

Direct Digital imaging

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

5

Indirect digital imaging

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

6

Storage phosphor imaging

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

7

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

50 to 90% depending on speed of film

8

Digital subtraction

Reversing radiopaycity

9

Pixel

A discrete unit of info; a picture element

10

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

False

11

Digital imaging requires more x-radiation than conventional radiography

False

12

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

True

13

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

True

14

All intraoral sensors can be heat sterilize after use

False

15

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

True

16

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

True

17

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

True

18

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

True

19

When was digital imaging introduced to dentistry

1987

20

What can digital imaging be used for

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

21

Digital imaging require less radiation then does conventional radiography because

The sensor is more sensitive to x-ray

22

The image receptor found in the intraoral sensor is termed what

CCD

23

Digital imaging systems can be used for which images

Bitewing, panoramic, cephalometric

24

All of the following are advantages of digital imaging except

Size of the intraoral sensor

25

Which describes a use of panoramic image

Evaluation of impacted molars

26

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

Focal trough

27

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

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

28

A thyroid collar is not recommended in panoramic imaging because

It blocks the x-ray beam and obscures info

29

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

Frankfort

30

Procedure for pano

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

Procedure for intraoral imaging

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

32

Panoramic and intraoral imaging procedures

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

33

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

Parenteral exposure

34

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

Intermediate level disinfectants

35

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

Low-level disinfectants

36

What happens when chin is tip down during pano

Exaggerated smile line

37

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

Anterior teeth appear narrowed and blurred

38

What happens when chin is tipped up

Reverse smile line

39

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

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

40

Area one

Dentition

41

Area 2

Ramus and cervical spine

42

Area three

Nasal cavity and maxillary sinus

43

Area 4

Body of mandible

44

Area five

Condyle

45

Area six

Hyoid

46

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

Anterior teeth appear widened and blurred