Question 1

If more radiation reaches the digital sensor, the gray value will decrease.

Accepted Answer

A) True 
 B)False

Question 2

x and y coordinates are used by the computer to reconstruct digital data obtained by the sensor into an image that can be viewed on the computer monitor.

Accepted Answer

A) True 
 B)False

Question 3

CCD and CMOS digital image receptors very closely resemble film and capture x-ray energy in a manner similar to film.

Accepted Answer

A) True 
 B)False

Question 4

The discernable separation of closely adjacent image details is referred to as contrast.

Accepted Answer

A) True 
 B)False

Question 5

What is digital subtraction?

Accepted Answer

A technique that permits comparison of d

Question 6

Most digital imaging systems cannot be used with conventional x-ray machines.

Accepted Answer

A) True 
 B)False

Question 7

Digitization converts radiographs obtained with traditional film-based radiography to digital images.

Accepted Answer

A) True 
 B)False

Question 8

Which of these is NOT a limitation of digital imaging?

Accepted Answer

A)  The need for plastic infection control barriers may hinder placement intraorally. 
B)  Smaller overall dimensions limit recording area. 
C)  The initial costs to convert from film-based imaging can be expensive. 
D)  Images can be manipulated. 
A)  The need for plastic infection control barriers may hinder placement intraorally. 
B)  Smaller overall dimensions limit recording area. 
C)  The initial costs to convert from film-based imaging can be expensive. 
D)  Images can be manipulated.

Question 9

Which of the following features of digital imaging software currently available provides the best aid to interpreting digital images?

Accepted Answer

A)  Density/contrast manipulation 
B)  Colorization 
C)  Embossing 
D)  Reversing the gray scale 
A)  Density/contrast manipulation 
B)  Colorization 
C)  Embossing 
D)  Reversing the gray scale

Question 10

How many gray levels can a computer monitor display?

Accepted Answer

A)  8 
B)  32 
C)  256 
D)  65,500 
A)  8 
B)  32 
C)  256 
D)  65,500

Question 11

Each of the following statements regarding photostimulable phosphor plates is correct EXCEPT one. Which one is the EXCEPTION?

Accepted Answer

A)  They use rare earth-coated plates. 
B)  The plates are disposable. 
C)  They store x-ray energy until stimulated by a laser beam. 
D)  They are similar to film-based radiography in that they must be "developed" later. 
A)  They use rare earth-coated plates. 
B)  The plates are disposable. 
C)  They store x-ray energy until stimulated by a laser beam. 
D)  They are similar to film-based radiography in that they must be "developed" later.

Question 12

Digitization uses a computer to superimpose two standardized radiographic images, causing the like areas of the image to "cancel" each other out, leaving only the changes visible.

Accepted Answer

A) True 
 B)False

Question 13

Line pairs refers to the total number of shades of gray visible in an image.

Accepted Answer

A) True 
 B)False

Question 14

Each pixel is a single dot in a digital image.

Accepted Answer

A) True 
 B)False

Question 15

Each of the following statements regarding pixels is correct EXCEPT one. Which one is the EXCEPTION?

Accepted Answer

A)  The more pixels in an image, the higher the resolution and the sharper the image. 
B)  The number and size of pixels determines the spatial resolution of an image. 
C)  When the number of pixels is low, the image appears to have jagged edges. 
D)  A pixel with a stored number of 0 would be pure white. 
A)  The more pixels in an image, the higher the resolution and the sharper the image. 
B)  The number and size of pixels determines the spatial resolution of an image. 
C)  When the number of pixels is low, the image appears to have jagged edges. 
D)  A pixel with a stored number of 0 would be pure white.

Question 16

The digital technology used in digital radiographic sensors is similar to that used in digital cameras and computer memory chips.

Accepted Answer

A) True 
 B)False

Question 17

What is the difference between a digital image and a radiograph?

Accepted Answer

A digital image has no physica

Question 18

What is the digital equivalent of film fog?

Accepted Answer

Electronic noise, an

Question 19

The size and number of pixels that make up a digital image determine the spatial resolution. Spatial resolution is measured in line pairs.

Accepted Answer

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

Question 20

What determines the quality of a digital image?

Accepted Answer

A)  Gray scale 
B)  Spatial resolution 
C)  Combination of pixels 
D)  All of the above 
A)  Gray scale 
B)  Spatial resolution 
C)  Combination of pixels 
D)  All of the above

Exam 9: Infection Control

If more radiation reaches the digital sensor, the gray value will decrease.

x and y coordinates are used by the computer to reconstruct digital data obtained by the sensor into an image that can be viewed on the computer monitor.

CCD and CMOS digital image receptors very closely resemble film and capture x-ray energy in a manner similar to film.

The discernable separation of closely adjacent image details is referred to as contrast.

What is digital subtraction?

Most digital imaging systems cannot be used with conventional x-ray machines.

Digitization converts radiographs obtained with traditional film-based radiography to digital images.

Which of these is NOT a limitation of digital imaging?

Which of the following features of digital imaging software currently available provides the best aid to interpreting digital images?

How many gray levels can a computer monitor display?

Each of the following statements regarding photostimulable phosphor plates is correct EXCEPT one. Which one is the EXCEPTION?

Digitization uses a computer to superimpose two standardized radiographic images, causing the like areas of the image to "cancel" each other out, leaving only the changes visible.

Line pairs refers to the total number of shades of gray visible in an image.

Each pixel is a single dot in a digital image.

Each of the following statements regarding pixels is correct EXCEPT one. Which one is the EXCEPTION?

The digital technology used in digital radiographic sensors is similar to that used in digital cameras and computer memory chips.

What is the difference between a digital image and a radiograph?

What is the digital equivalent of film fog?

The size and number of pixels that make up a digital image determine the spatial resolution. Spatial resolution is measured in line pairs.

What determines the quality of a digital image?

Dental Radiography: Historical Perspective and Future Trends

Characteristics and Measurement of Radiation

The Dental X-Ray Machine: Components and Function

Factors Affecting Radiographic Quality

Effects of Radiation Exposure

Radiation Protection

Dental X-Ray Film and Processing Methods

Digital Radiography and Image Acquisition

Legal and Ethical Responsibilities

Patient Relations and Education

Introduction to Radiographic Examinations

The Periapical Examinationparalleling Technique

The Periapical Examinationbisecting Technique

The Bitewing Examination

The Occlusal Examination

The Panoramic Examination

Identifying and Correcting Undiagnostic Radiographs

Quality Control and Environmental Safety in Dental Radiography

Image Orientation and Introduction to Interpretation

Recognizing Normal Radiographic Anatomy Intraoral Radiographs

Recognizing Normal Radiographic Anatomy Panoramic Radiographs

Radiographic Appearance of Dental Materials and Foreign Objects

The Use of Radiographs in the Detection of Dental Caries

The Use of Radiographs in the Evaluation of Periodontal Diseases

Describing Radiographic Anomalies, Lesions, and Opportunistic Screening

Pediatric Radiographic Techniques

Radiographic Techniques for Patients With Special Needs

Radiographic Techniques for Specific Oral Conditions

Radiographic Techniques

Filters