Radiology Flashcards
An analog dental x-ray unit:
A. Can not be used for digital radiography
B. is not capable of producing the short exposure time needed for digital radiograpy
C. can be used for digital radiography
D. Is not capable of producing the long exposure needed
E. None of the above
C. can be used for digital radiography
The storage phosphor sensor is :
A, larger than direct sensors
B. more rigid than direct sensors
C. more sensitive than direct sensors
D. thinner than direct sensors
E. none of the above
D. thinner than direct sensors
The human eye can direct:
A. 9 to 10 gray levels
B. 256 gray levels
C. 100 gray levels
D. 32 gray levels
E. 100 gray levels
D. 32 gray levels
Digital intraoral sensors are:
A. autoclavable
B. Extremely sturdy
C. available in only one size
D. quite fragile
C. none of the above
B. Extremely sturdy
when compared to D-speed film, digital radiography can reduce the patient’s exposure by:
A. 60 %
B, 90%
C. 150%
D. 200%
E. none of the above
A. 60 %
Digital images:
A. can be integrated into an office record system
B. can be enlarged
C. can be inverted
D. can be colorized
E. all of the above
E. all of the above
True or False
Digital radiography is technique sensitive in placement of the sensor in relation to the teeth
True
True or False
In a direct digital radiography system , the sensor is connected by a wire to the computer
True
Digital radiography systems can be used for which of the following?
A. Bitewing images
B. perlapical images
C. vertical bitewing images
D. panoramic images
E. all of the above
E. all of the above
Digital radiography can be used for which of the following ?
A. to detect carries
B. to monitor an endodontic procedure
C. to detect bone loss and /or dental disease
D. All of the above
D. all of the above
Each of the following is a digital image receptor EXCEPT one. Which one is the EXCEPTIONS?
A. CCD
B. CMOS
C. XCP
D.PSP
C. XCP
A panoramic radiograph is valuable when diagnosing each of the following EXCEPT one. Which one is the EXCEPTIONS?
A. a cyst
B. an impacted molar
C. recurent caries
D. a supernumerary tooth
C. recurent caries
dental radiographic examination are taken________?
A. only when indicated
B. as prescribed by the dentist
C. for diagnosis and treatment
D. All of the above
D. All of the above
_______ is an advantage of the use of solid -state detectors over film.
A. computerized archiving and image display
B. chemical processing of the receptor
C. reduction in the number of retakes
D, active surface area for image acquisition
A. computerized archiving and image display
The images of choice for the detection and monitoring of dental caries in the posterior teeth are?
A. Bitewing images
B. periapical images
C. occlusal images
D. full mouth survey
A. bitewing images
To maintain infection control, most manufactures recommend that the sensor used in digital radiography be?
A. packaged for steam sterilization and autoclaved
B. disposed of after use, with biohazard waste
C. decontaminated with soup and water and disinfected with a high-level disinfectant
D. wiped with an intermediate-level disinfectant and covered with a plastic barrier
C. sanitized and immersed in a chemical sterilant
D. wiped with an intermediate-level disinfectant and covered with a plastic barrier
Digital radiography requires less radiation exposure to produce an image than film -based radiography because the_____?
A. chemical processing steps are eliminated
B. radiation used for digital imaging is different than film-based imaging
C. image receptor (CCD or CMOS) is more sensitive to x-rays than film
D. the computer can control the amount of radiation output better than clinician
C. image receptor (CCD or CMOS) is more sensitive to x-rays than film
phosphor plate receptors______?
A. are wired digital receptors
B. provide real-time image display
C. require laser scanning
D. are solid -state detectors
C. require laser scanning
Phosphor plate receptors are susceptible to________?
A. overexposure
B. scar artifacts
C. more retakes
D. scan errors
D. scan errors
The paralleling technique is used for _________ radiographs?
A. Periapical
B. Bitewing
C. panoramic
D. A and B
D. A and B
To achieve proper placement with the paralleling technique, the receptor must be placed ________?
A. vertically parallel to the teeth
B. Horizontally parallel to the teeth
C. toward the midline of the mouth
D. All of the above
D. All of the above
When exposing maxillary and bitewing images, the preferred position aligns the ________?
A. occlusal plane parallel to the floor
B. midsagittal plane perpendicular to the floor
C . occlusal plane perpendicular to the floor
D. Both A and B
D. Both A and B
For a maxillary central incisor periapical image, a _____ should be used for the receptor orientation
A. horizontal placement with the receptor adjacent to the first molar
B. vertical placement with the receptor adjacent to the first molar
C. diagonal placement with the receptor adjacent to the first molar
D. any of the above
B. vertical placement with the receptor adjacent to the first molar
What is the most common cause for retakes in bitewing imaging?
A. proximal horizontal overlap
B. image elongation
C. image foreshortening
D. cone cut
A. proximal horizontal overlap
Topographic occlusal imaging is used mostly in what instance?
A. when mouth opening is limited
B. to obtain anterior images on children
D. as anterior perlapical replacements on adults
C. all of the above
C. all of the above
Receptor instruments with ring guides ( XCP) _________?
A. must be used correctly by the clinician to avoid placement errors
B. assure image accuracy and quality
C. require sterilization before use
D. All of the above
D. All of the above
Who has the ethical responsibility to adopt ALARA?
A. the dental assistant
B. the dental hygienist
C. the dentist
D. all of above
D. all of above
True or false
it is necessary to change the mA and kVp with each image taken
False
The gray value represents?
A. the number that corresponds to the amount of radiation received by the pixel
B.refers to the number of shades of gray visible in an image
C. discreet units of information that together constitute an image
D. a digital form that can be processed by a computer
A. the number that corresponds to the amount of radiation received by the pixel
The gag reflex is
A, an acquired habit
B. not present in all patients
C. a body defense mechanism
D. a contraindication for intraoral radiography
C. a reaction the clinician can ignore
C. a body defense mechanism
True or false
The term “ALARA” stands for “as low as radiation allows
False
A image is captures within the sensor by:
A. a matrix of picture elements (pixels)
B. is dependent on the resolution desired
C. transferring it directly into the computer
D. it is electronically stored within the sensor indefinitely
A. a matrix of picture elements (pixels)
The advantages of paralleling technique are
A. producing images with dimensional accuracy
B. simple, easy to learn and use
C. easy to standardize and accurately repeated
D. all of the above
D. all of the above
True or False
when using the paralleling technique, incorrect horizontal angulation will result in elongation
False
A bite-wing image, either horizontal or vertical will include:
A. crowns of the maxillary and mandibular teeth
B. the interproximal areas
C. areas of crestal bone on the same image
D. A and B only
C. all of the above
D. A and B only
A periapical image should include:
A. entire tooth and supporting structure
B. only the apex of the tooth
C. 2-3 mm of bone around apex of tooth
D. A and C
D. A and C
True or False
Foreshortening is excessive vertical angulation resulting in the tooth/teeth in the image being shortened
True
What type of images allow the entire dentition to be viewed on a single film?
A. occlusal
B. cephalometric
C. panoramic
D. B and C only
C. panoramic
Which of the following results in the most mSv (microsieverts) exposure to a patient?
A. full mouth survey
B panoramic
C. bitewing series
D. periapical
A. full mouth survey
True or False
It is not necessary to change the impulses when using a digital generator to take an image when using a CCD or CMOS sensor
False
Digital radiography allows for:
A. manipulation of the image as needed for more or less contrast
B. Enlargement of the image
C. can be emailed or printed for consultation with referrals and insurance companies
D. A and B
E. All of the above
E. All of the above
An underexposed image may be caused:
A. not positioning the ring and PID touching the check
B. not having the PID parallel to the XCP for even distribution of radiation
C.not changing exposure settings due to tori, xygomatic process or bone density
D. all of the above
D. all of the above
True or False
When exposing a panoramic image, it is not necessary to remove necklaces, earrings, eyewear, hearing aids, piercing jewelry, partial or denture
False
Dental cone beam computed tomography (CT) provides detailed images of the bones and is preformed to:
A. evaluate disease of the jaw and dentition
B. bony structure of the face, nasal cavity
C. sinuses
D. all of theses structures
E. none of the above
D. all of theses structures
True or False
CBTC requires specialized software to image and view the images
True
Which of these statements is NOT true.
A. CBTC has a focused beam which reduces scatter radiation, resulting in better image quality
B, a major advantage of CBCT is its ability to image bone and soft tissue at the same time
C. No radiation remains in a patients body after CT examination
D. a single scan produces a limited variety of views and angles that can be manipulated or a more completed evaluation
D. a single scan produces a limited variety of views and angles that can be manipulated or a more completed evaluation
To consistently record the distals of the canines/cupids it is necessary to:
A. pull the sensor towards the anterior of the mouth as much as anatomy allows
B. angle the sensor across the arch towards the opposite canine/cuspid
C. It is necessary to do both A and B, including realigning the PID off the mesial portion of the ring
D. it is impossible to record the disital of the canines/ cuspids due to the sensor being too large
B. angle the sensor across the arch towards the opposite canine/cuspid
True or False
For adequate radiation to excite the pixels, it is crucial to always have the ring touching the patient’s face, with the PID touching the ring, resulting in consistent resolution of the image
True
True or False
To open the contacts between the molars on a horizontal bitewing, the mesial portion of the sensor should be slightly towards the midline or “opening the door”
True
True or False
Some images may require that the XCP and sensor be placed on top of the tongue for both comfort to the patient and ideal positioning
True
