Deck 25: Digital Imaging

Question 1

A sensor with a fiberoptic 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.

Answer 1

Direct digital imaging.

Question 2

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

Answer 2

Conventional dental x-ray unit

Question 3

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

A) The images are inferior to conventional 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.

Answer 3

The original digital image can be enhanced.

Question 4

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 5

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 6

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 7

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

Question 8

Storage phosphor imaging:

A) Is a form of direct digital imaging.
B) Is a wired digital radiography system.
C) Uses a sensor with a fiber-optic cable.
D) Uses a reusable imaging plate.

Question 9

The images are cleared from the storage phosphor imaging plates by:

A) Being processed in an x-ray processing machine.
B) Being autoclaved.
C) Being exposed to viewbox light for several minutes.
D) Being placed in a microwave oven for 1 minute.

Question 10

____ digital imaging involves digitizing an existing x-ray film using a CCD camerA. Indirect digital imaging is ____ to direct digital imaging.

A) Indirect; inferior
B) Indirect; superior
C) Direct; inferior
D) Direct; superior

Question 11

Advantages of digital imaging include:

A) All sensors can be autoclaved.
B) Increased speed of image viewing.
C) Color radiography rather than black and white.
D) Low initial setup costs.

Question 12

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

A) The size of the digitized image makes it attractive as a patient education tool.
B) There is an opportunity for an increase in interactive dialogue between the patient and the radiographer.
C) The use of visualization can increase the patient's understanding of the disease process.
D) Some combination of the above.
E) All of the above.

Question 13

The electrons that compose the silicon charge-coupled device (CCD) can be visualized as being divided into an arrangement of blocks or picture elements known as:

A) A field arrangement.
B) Pixels.
C) Phosphors.
D) A grid.

Question 14

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) Pseudocolor alteration
B) Digital subtraction
C) Contrast
D) Image orientation

Question 15

A primary advantage to digital imaging is the superior gray-scale resolution that results. 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.

Question 16

The human eye can appreciate ____ shades of gray.

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

Question 17

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 18

Given that the human eye can resolve 8 to 10 lp/mm, a CCD system is inadequate for diagnosis of dental disease. The majority of the 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 19

Exposure times are ____ than that required for conventional radiography.

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

Question 20

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

A) Image storage and communication are easier with digital networking.
B) The digital image cannot be incorporated into the electronic record.
C) Images can be electronically transmitted to other dental professionals.
D) Some combination of the above.
E) All of the above.

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.