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Dental Assistant Radiology > Chapter 1 > Flashcards

Chapter 1 Flashcards

1
Q

Who was awarded the first Nobel Prize for physics in 1901, for his experimental work with radiation?

A

D) W. C. Roentgen

Wilhelm Conrad Roentgen discovered the x-ray on November 8, 1895.

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2
Q

Who is credited with introducing the bitewing radiograph?

A

B) H. R. Raper

Howard Riley Raper wrote the first dental radiology textbook, Elementary and Dental Radiology, and introduced bitewing radiographs in 1925.

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3
Q

Who developed the hot cathode ray tube?

A

A) W. D. Coolidge

William David Coolidge developed the shockproof hot cathode tube while working for General Electric Company in 1913.

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4
Q

Who developed the first digital imaging system?

A

B) F. Mouyen

Francis Mouyen developed the first digital imaging system called RadioVisioGraphy in 1987.

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5
Q

What New Orleans dentist first made practical use of x-rays in the treatment of dental patients?

A

D) C. E. Kells

C. Edmund Kells took the first dental radiograph on a living subject in the United States.

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6
Q

Early researchers working in the field of radiography were not aware that continued exposure to x-rays produced accumulations of radiation effects in the body because x-rays are invisible.

A

A) Both the statement and reason are correct and related.

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7
Q

The most significant advancement in the early days of radiography came in 1913 when W. D. Coolidge

A

D) introduced an x-ray tube that allowed for an x-ray output that could be predetermined and accurately controlled.

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8
Q

The first dental radiograph was produced using an exposure time of

A

D) 25 minutes

Dr. Otto Walkhoff was the first to expose a prototype of a dental radiograph.

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9
Q

What component of the dental x-ray machine best limits the size of the x-ray beam to the approximate size of the image receptor?

A

C) A rectangular PID

A rectangular position indicating device (PID) limits the size of the x-ray beam that strikes the patient.

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10
Q

Panoramic radiology became popular in the

A

D) 1960s

Panoramic radiography became popular with the introduction of the panoramic x-ray machine.

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11
Q

Which of the following is not true regarding cone beam volumetric imaging (CBVI)?

A

B) It uses less radiation than a panoramic radiograph.

The dose is still 4 to 15 times that required for a panoramic radiograph.

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12
Q

Early dental film required long exposure times because

A

B) the emulsion was only on one side.

Early film had emulsion on only one side and required long exposure times.

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13
Q

Each of the following is an advantage of digital imaging except one. Which one is the exception?

A

C) It allows the use of pointed cones without radiation hazards.

Pointed cones are no longer acceptable because x-rays are scattered through contact with the material of pointed cones.

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14
Q

The bisecting technique was the first and earliest radiographic technique for exposing intraoral radiographs because the bisecting technique is based on the rule of isometry.

A

B) Both the statement and reason are correct but not related.

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15
Q

Which radiographic technique is less complicated and produces better quality radiographic images?

A

B) Paralleling

The paralleling technique is less complicated and produces better quality radiographic images.

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16
Q

The rule of isometry is the basis for what dental radiographic technique?

A

A) Bisecting

In 1907, A. Cieszyński, a Polish engineer, applied the ‘rule of isometry’ to dental radiology and is credited for suggesting the bisecting technique.

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17
Q

Each of the following is a potential use of dental radiographs except one. Which one is the exception?

A

D) Assessing patient self-care

Home care is best determined during a visual clinical examination.

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18
Q

Producing radiographs of the teeth and/or the oral cavity is called?

A

E) Radiography

Radiography is defined as the making of radiographs by exposing and processing x-ray film.

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19
Q

Dental assistants and dental hygienists meet an important need by providing each of the following except one. Which one is the exception?

A

D) Prescribing radiographs

Dentists have the authority and responsibility for prescribing and diagnosing conditions from dental radiographs.

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20
Q

The positioning indicating device (PID) is sometimes called a ‘cone’ because?

A

A) Both the statement and reason are correct and related.

Because cones were used for so many years, many still refer to the open cylinders or rectangular tubes as cones.

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21
Q

O. Walkhoff was awarded the first Nobel Prize for physics.

A

FALSE

William Conrad Roentgen was awarded the first Nobel Prize for physics in 1901 for the discovery of the x-ray.

22
Q

C. Edmund Kells encouraged the practical use of radiographs in dentistry.

A

TRUE

C. Edmund Kells took the first dental radiograph on a living subject in the United States.

23
Q

The radiographer should help the patient hold the image receptor in place during exposure.

A

FALSE

Continued exposure results in the accumulation of radiation effects in the body that can be dangerous to the radiographer.

24
Q

In the early 1900s dental patients would have to be sent to hospitals or a physician’s office to have a dental radiograph exposed.

A

TRUE

It was customary to send the patient to a hospital or physician’s office on those rare occasions when dental radiographs were prescribed.

25
Q

Early dental x-ray machines were an electrical hazard.

A

TRUE

Dental x-ray machines manufactured before 1920 were an electrical hazard because of open, uninsulated, high-voltage supply wires.

26
Q

Pointed cones should be used to direct radiation from the x-ray tube to the patient.

A

FALSE

Pointed cones allow x-ray scatter to reach the patient through contact with the material of the cone.

27
Q

Dental x-ray film available today is coated with emulsion on both sides.

A

TRUE

Today’s films are double emulsion and require much shorter exposure times.

28
Q

The bisecting technique is the technique of choice for intraoral radiography.

A

FALSE

The paralleling technique is less complicated and produces better radiographs more consistently than the bisecting technique.

29
Q

Dental radiography supplements visual and physical examination to provide a quality evaluation of a patient.

A

TRUE

Many conditions may go undetected without radiographic examination.

30
Q

Digital imaging systems can reduce radiation dosage more than film-based radiography.

A

TRUE

Digital sensors that replace film are more sensitive to x-rays, allowing for a reduction in radiation dose.

31
Q

A radiograph is an image produced by exposure to x-rays.

A

TRUE

The definition of radiograph is an image produced on photosensitive film by exposure to x-rays.

32
Q

Computed tomography eliminates the use of radiation to produce an image.

A

FALSE

Computed tomography or CT scans deliver high radiation doses.

33
Q

Digital imaging replaces the conventional dental x-ray machine.

A

FALSE

The conventional dental x-ray machine is used for both digital and film-based imaging.

34
Q

The paralleling technique is based on the rule of isometry.

A

FALSE

The bisecting technique is based on the rule of isometry.

35
Q

The PID is used to direct the useful beam of radiation.

A

TRUE

PID stands for position indicating device.

36
Q

X-radiation was discovered when Roentgen was working with a Crookes tube.

A

TRUE

Roentgen discovered x-radiation while working with a Crookes tube.

37
Q

Roentgen named his discovery the roentgen ray.

A

FALSE

He spoke of it as an x-ray because the symbol x represented the unknown.

38
Q

The x-radiation output of the Crookes tube could be predetermined and accurately controlled.

A

FALSE

The x-ray output of the Coolidge tube could be predetermined and accurately controlled.

39
Q

Early scientists and researchers working in the field of radiography were not aware that continued exposure produced accumulations of radiation effects in the body.

A

TRUE

Because x-rays are invisible, they were not aware of the dangers.

40
Q

In the early 1900s, it was common practice for the radiographer to help the patient hold the film in place while making the exposure.

A

TRUE

It was common practice for the dentist or dental assistant to help the patient hold the film in place.

41
Q

Who first determined that x-rays would play a role in dentistry?

A

Dr. Otto Walkhoff first held a small photographic plate in his mouth for a 25-minute exposure.

42
Q

Who was the first person to put the dental x-ray into practical use in dentistry?

A

C. Edmund Kells was credited with putting the x-ray into practical use in dentistry.

43
Q

Who developed the hot cathode ray tube?

A

In 1913, William David Coolidge designed the hot cathode tube.

44
Q

Which radiograph displays the entire dentition and surrounding structures?

A

A panoramic radiograph displays a broad area of the mandible and maxilla.

45
Q

What is the technique of choice for intraoral radiography?

A

The paralleling technique is the technique of choice.

46
Q

In dental digital imaging systems, what replaces film?

A

Sensors replace film in digital imaging systems.

47
Q

What medical imaging modality records a selected plane of tissues?

A

A computed tomography (CT) scan images a single selected plane of tissues.

48
Q

What is the name of the device that functions to direct the x-ray beam toward the patient?

A

A position indicating device (PID) is used to direct the x-ray beam.

49
Q

What is the purpose of studying the history of radiography and dental radiography?

A

To understand the evolution of concepts and appreciate future advancements.

50
Q

What are the two techniques for exposing intraoral dental radiographs?

A

The bisecting technique and the paralleling technique.

Dental Assistant Radiology (8 decks)

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