Ch 25

Question 1

What is one of the primary advantages of digital radiography over traditional film-based radiography?

Answer 1

Immediate image viewing

Question 2

Which of the following is NOT an advantage of digital radiography?

A) Reduced radiation exposure
B) Ability to enhance images
C) Longer storage time
D) Instant image production

Answer 2

Longer storage time

Question 3

Digital radiography requires the use of a sensor to capture images. What is a common sensor type used in this technology?

Answer 3

PSP plate

Question 4

What is the primary function of the analog-to-digital converter (ADC) in digital imaging?

Answer 4

To convert the electronic signal into digital form

Question 5

When comparing resolution between digital radiography and conventional film, which statement is accurate?

Answer 5

Digital radiography has a lower resolution than conventional film.

Question 6

What does the term “pixel” refer to in digital radiography?

Answer 6

A single unit of data in a digital image

Question 7

Which of the following is a common disadvantage of digital radiography?

A) High radiation dose
B) High cost of initial setup
C) Inability to enhance images
D) Limited storage capacity

Answer 7

B) High cost of initial setup

Question 8

Which imaging system uses reusable plates that store x-ray energy for later reading by a laser scanner?

A) CCD
B) CMOS
C) PSP
D) Film-based

Answer 8

C) PSP

Question 9

What is the primary role of a charge-coupled device (CCD) in digital radiography?

Answer 9

To capture and convert X-ray energy into an electrical signal

Question 10

How does digital radiography contribute to infection control in dental practices?

Answer 10

Sensors are easy to disinfect and sterilize.

Question 11

Digital subtraction in radiography is used to:

Answer 11

Highlight changes between two images.

Question 12

In digital radiography, what does bit depth refer to?

Answer 12

The number of shades of gray that can be stored

Question 13

Which of the following imaging techniques provides a three-dimensional view of dental structures?

Answer 13

Cone-beam computed tomography (CBCT)

Question 14

Which of the following is an advantage of phosphor plate systems over CCD or CMOS sensors?

A) Higher radiation dose
B) Greater durability
C) Larger imaging area
D) Lower image quality

Answer 14

C) Larger imaging area

Question 15

What is the primary purpose of contrast adjustment in digital radiography?

Answer 15

To enhance the diagnostic quality of the image

Question 16

What is the primary purpose of panoramic imaging?

Answer 16

Examine the upper and lower jaws on a single image

Question 17

Which of the following conditions can be evaluated using panoramic imaging?
A) Caries
B) Periodontal disease
C) Impacted teeth
D) Periapical abscess

Answer 17

Impacted teeth

Question 18

What is the role of the focal trough in panoramic imaging?

Answer 18

It is the area where structures are clearly seen

Question 19

Which of the following is NOT a disadvantage of panoramic radiography?
A) Image quality is less sharp than intraoral images
B) It cannot diagnose caries or periapical lesions
C) It is expensive
D) It causes high radiation exposure

Answer 19

It causes high radiation exposure

Question 20

What type of image is a “ghost image” in panoramic radiography?

Answer 20

An artifact resembling a true image but appearing on the opposite side

Question 21

What does the term “tomography” refer to in panoramic imaging?

Answer 21

Imaging a specific section of the body while blurring others

Question 22

What should be removed from the patient before taking a panoramic image?

Answer 22

Glasses

Question 23

Which positioning error leads to an exaggerated smile on a panoramic image?

Answer 23

B) Chin too low

Question 24

What does the collimator in a panoramic x-ray unit do?

Answer 24

It creates a narrow, vertical slit for the x-ray beam

Question 25

Which plane must be parallel to the floor for proper panoramic imaging?

Answer 25

Frankfort plane

Question 26

Which of the following is a preparation step before taking a panoramic radiograph?
A) Position the thyroid collar correctly
B) Ensure the patient removes all metal objects from the head and neck
C) Adjust the exposure time based on patient size
D) Ensure the patient bites directly into the sensor

Answer 26

B) Ensure the patient removes all metal objects from the head and neck

Question 27

What image is produced when the patient is not positioned correctly in the focal trough?

Answer 27

Blurred or indistinct image

Question 28

What is the vertical angulation of the panoramic tubehead?

Answer 28

Fixed at -10 degrees

Question 29

What results from improper placement of the lead apron during panoramic imaging?

Answer 29

Lead apron artifact

Question 30

What is a double image in panoramic radiography?

Answer 30

Positioned outside the mouth during exposure

Question 31

What should the patient do with their tongue during panoramic imaging?

Answer 31

Press it against the roof of the mouth

Question 32

What is the primary advantage of panoramic imaging over intraoral imaging?

Answer 32

It provides a view of the entire maxilla and mandible.

Question 33

What can panoramic radiographs NOT diagnose effectively?

Answer 33

Caries

Question 34

How does panoramic imaging minimize patient exposure to radiation?

Answer 34

The collimator reduces scatter radiation.

Question 35

Which conditions should panoramic imaging NOT be used to diagnose?

Answer 35

Periodontal Disease
Caries
Periapical Lesions