Ch 25 Flashcards
What is one of the primary advantages of digital radiography over traditional film-based radiography?
Immediate image viewing
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
Longer storage time
Digital radiography requires the use of a sensor to capture images. What is a common sensor type used in this technology?
PSP plate
What is the primary function of the analog-to-digital converter (ADC) in digital imaging?
To convert the electronic signal into digital form
When comparing resolution between digital radiography and conventional film, which statement is accurate?
Digital radiography has a lower resolution than conventional film.
What does the term “pixel” refer to in digital radiography?
A single unit of data in a digital image
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
B) High cost of initial setup
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
C) PSP
What is the primary role of a charge-coupled device (CCD) in digital radiography?
To capture and convert X-ray energy into an electrical signal
How does digital radiography contribute to infection control in dental practices?
Sensors are easy to disinfect and sterilize.
Digital subtraction in radiography is used to:
Highlight changes between two images.
In digital radiography, what does bit depth refer to?
The number of shades of gray that can be stored
Which of the following imaging techniques provides a three-dimensional view of dental structures?
Cone-beam computed tomography (CBCT)
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
C) Larger imaging area
What is the primary purpose of contrast adjustment in digital radiography?
To enhance the diagnostic quality of the image
What is the primary purpose of panoramic imaging?
Examine the upper and lower jaws on a single image
Which of the following conditions can be evaluated using panoramic imaging?
A) Caries
B) Periodontal disease
C) Impacted teeth
D) Periapical abscess
Impacted teeth
What is the role of the focal trough in panoramic imaging?
It is the area where structures are clearly seen
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
It causes high radiation exposure
What type of image is a “ghost image” in panoramic radiography?
An artifact resembling a true image but appearing on the opposite side
What does the term “tomography” refer to in panoramic imaging?
Imaging a specific section of the body while blurring others
What should be removed from the patient before taking a panoramic image?
Glasses
Which positioning error leads to an exaggerated smile on a panoramic image?
B) Chin too low
What does the collimator in a panoramic x-ray unit do?
It creates a narrow, vertical slit for the x-ray beam
Which plane must be parallel to the floor for proper panoramic imaging?
Frankfort plane
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
B) Ensure the patient removes all metal objects from the head and neck
What image is produced when the patient is not positioned correctly in the focal trough?
Blurred or indistinct image
What is the vertical angulation of the panoramic tubehead?
Fixed at -10 degrees
What results from improper placement of the lead apron during panoramic imaging?
Lead apron artifact
What is a double image in panoramic radiography?
Positioned outside the mouth during exposure
What should the patient do with their tongue during panoramic imaging?
Press it against the roof of the mouth
What is the primary advantage of panoramic imaging over intraoral imaging?
It provides a view of the entire maxilla and mandible.
What can panoramic radiographs NOT diagnose effectively?
Caries
How does panoramic imaging minimize patient exposure to radiation?
The collimator reduces scatter radiation.
Which conditions should panoramic imaging NOT be used to diagnose?
Periodontal Disease
Caries
Periapical Lesions
