Deck 25: Digital Imaging

Question 1

How many shades of gray can the human eye distinguish?

A)16
B)32
C)64
D)256

Answer 1

32

Question 2

Digital imaging uses _________________ to produce an image.

A)an x-ray processor
B)radiographic film
C)processing chemistry
D)an electronic sensor and computerized imaging system

Answer 2

an electronic sensor and computerized imaging system

Question 3

(1)A primary advantage to digital imaging is the superior gray-scale resolution that results.(1)Digital imaging uses up to 32 shades of gray.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true;the second statement is false.
D)The first statement is false;the second statement is true.

Answer 3

The first statement is true;the second statement is false.

Question 4

Advantages of the use of digital imaging include which of the following?

A)Sensors are more comfortable than film.
B)There is an opportunity for an increase in interactive dialogue between the patient and the radiographer.
C)Digital imaging has a higher resolution than film.
D)A better source of legal documentation than film.

Question 5

The images are cleared from the storage phosphor imaging plates by

A)being processed in an x-ray processing machine.
B)a clearing step within the scanner.
C)being exposed to viewbox light for several minutes.
D)being placed in a microwave oven for 1 minute.

Question 6

Most digital imaging systems use a ______________ as the x-radiation source.

A)flat-bed scanner
B)conventional dental x-ray unit
C)commercial analog intraoral camera
D)commercial digital intraoral camera

Question 7

In order to be used for digital imaging,the x-ray unit timer must be adapted to allow exposures in a time frame of _______ of a second.

A)1/5
B)1/10
C)1/15
D)1/100

Question 8

Digital sensors contain distinct units of programmable gray values that are sensitive to x-rays called

A)a field arrangement.
B)pixels.
C)phosphors.
D)a grid.

Question 9

A sensor with a fiber optic cable linked to the computer is placed into the mouth of the patient and exposed to x-radiation.This is an example of

A)phosphor imaging.
B)use of the CCD camera.
C)direct digital imaging.
D)indirect digital imaging.

Question 10

Your patient is concerned about the amount of x-ray exposure she has had because she had x-rays taken quite often at her previous dental office.You explain to her that the images are necessary and you will be taking digital images which require _________ exposure than the films she previously had taken.Exposure times are ________ than that required for conventional radiography.

A)10% to 20% less
B)20% to 50% less
C)50% to 90% less
D)70% to 100% less

Question 11

With the feature of _______________,the gray-scale of the diagnostic image is reversed so that radiolucent images appear white and radiopaque images appear black.

A)pseudo-color alteration
B)digital subtraction
C)contrast
D)image orientation

Question 12

(1)Given that the human eye can resolve 8 to 10 lp/mm,a CCD system is inadequate for diagnosis of dental disease.(2)The majority of research has shown that the traditional radiographs perform at least as well as digital images and,at times,even better.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true;the second statement is false.
D)The first statement is false;the second statement is true.

Question 13

Conventional dental x-ray film has a resolution of ___________ lp/mm.

A)6 to 8
B)8 to 12
C)12 to 20
D)20 to 50

Question 14

Sensors that cannot be sterilized

A)should be disposed of between patients.
B)are wiped off with a surface disinfectant (iodophor)between patients.
C)require complete coverage with disposable plastic sleeves for each patient.
D)are placed in an immersion disinfectant for an appropriate amount of time between each patient.

Question 15

Storage phosphor imaging

A)is a form of direct digital imaging.
B)is a wired digital imaging system.
C)uses a sensor with a fiber optic cable.
D)uses a reusable imaging plate.

Question 16

With digital imaging,the term ___________ is used to describe the pictures that are produced.

A)radiograph
B)x-ray film
C)image
D)phosphor

Question 17

It is questionable whether digital images can be used as evidence in lawsuits,because

A)the images are inferior to film.
B)digitized images cannot be transported across state lines.
C)the original digital image can be enhanced.
D)a "hard copy" of the image does not exist.

Question 18

Which of the following would be a reason to switch from film to direct digital imaging?

A)The digital network makes it more difficult to store images.
B)The digital image cannot be incorporated into the electronic record.
C)Images cannot be electronically transmitted to other dental professionals.
D)Digital images can be printed when needed.

Question 19

(1)When you are preparing the sensor to use on your patient,it would be best to cover the sensor with a finger cot and then put on the barrier sleeve.(2)When you are placing the digital sensor in your patient's mouth,you would use a different placement technique than you would normally use when placing a film.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true;the second statement is false.
D)The first statement is false;the second statement is true.

Question 20

Your patient has asked why you prefer digital imaging to film.Which of the following reasons would you tell her?

A)The sensors can be autoclaved and reused.
B)The image appears almost instantaneously for both of us to view.
C)The images appear in color instead of black and white.
D)The initial setup costs were lower than it cost to set up film.

Question 21

How does the CMOS detector differ from the CCD detector?

A)The CMOS detector is silicon-based and differs from the CCD detector in the way that the pixels are read.
B)The CMOS detector is currently manufactured by one company and claims 25% less resolution than the CCD detector.
C)The CMOS detector is more expensive to produce than the CCD detector.
D)The CMOS detector is less durable than the CCD detector.