RADIOLOGY FINAL EXAM STUDY
GUIDE QUESTIONS AND ANSWERS
If the useful beam is not centered on the film in the patient's mouth, the result will be:
- ANSWER-collimator cutoff
A diagnostic film is made 10 mA and 4 impulses. The exposure that would produce
the same image at 5 mA would be: - ANSWER-8 impulses
Collimator cutoff (cone cutting) is caused by: - ANSWER-improper beam film
alignment
If a radiograph is described as "underpenetrated," then the error must be: -
ANSWER-too little kVp
Which of the following is used in the high-voltage circuit? - ANSWER-a step-up
transformer
Ionization occurs: - ANSWER-when an atom loses an electron
Identify the physicist who discovered x-rays: - ANSWER-Roentgen
Examples of particulate radiation include: - ANSWER-alpha particles
electrons
neutrons
The difference in the electromagnetic spectrum between x-rays and visible light lies
in the: - ANSWER-wavelength
All of the following are properties of x-rays EXCEPT: - ANSWER-x-rays travel in
wavy lines
Identify the particles that compose the nucleus of an atom: - ANSWER-protons
neutrons
The target or focal spot in the x-ray tube can be found at the: - ANSWER-positively
charged anode
Identify the metal used in the focal spot of the x-ray tube: - ANSWER-tungsten
The total x-ray energy produced by the collision of the electrons with the target inside
the x-ray tube is approximately: - ANSWER-less than 1%
Radiation damage to somatic cells in _____ passed on to succeeding generations. -
ANSWER-not
The output of a dental x-ray machine is expressed in _________. - ANSWER-
roentgen/sec
, The quality factory in measuring x-radiation is _____. - ANSWER-one
Radiographs taken to confirm that procedures have been completed are called
___________. - ANSWER-administrative radiographs
Presently the maximum permissible dose (MPD) for dental workers with ionizing
radiation is _________ - ANSWER-5000 /yr
It is predicted that the MPD will ____ be reduced in the near future. - ANSWER-not
Mechanical timers are usually inaccurate by at least a ____ second. - ANSWER-1/4
Panoramic films are ______ sensitive to darkroom light than intraoral film. -
ANSWER-more
If the developing time is 5 minutes, then the fixing time should be approximately
_________. - ANSWER-10 mins.
A clear film can be caused by __________ or ________. - ANSWER-no exposure
prolonged fixing
Defective film hangers should be disposed of because they can cause
___________. - ANSWER-scratches on the film
The protective coating on the emulsion is softened by the ________and hardened by
the ______. - ANSWER-developer
fixer
Although it does not get much publicity, __________ is the greatest health risk for
dental health care workers. - ANSWER-hepatitis
Anything one touches after working in the patient's mouth is considered to be
__________. - ANSWER-contaminated
Infection control procedures should be followed for ______ patients. - ANSWER-all
HBV and HBC are acronyms for types of the _________ virus. - ANSWER-hepatitis
Soaps for hand washing in the dental operatory should be ________. - ANSWER-
antiseptics
A litigious society is one whose members are likely to ___________ the dentist. -
ANSWER-bring suit against
The third party payers should not request ___________ from the dentist. -
ANSWER-administrative/post up radiographs
Original radiographs should _______ be kept in the dental office. - ANSWER-always
GUIDE QUESTIONS AND ANSWERS
If the useful beam is not centered on the film in the patient's mouth, the result will be:
- ANSWER-collimator cutoff
A diagnostic film is made 10 mA and 4 impulses. The exposure that would produce
the same image at 5 mA would be: - ANSWER-8 impulses
Collimator cutoff (cone cutting) is caused by: - ANSWER-improper beam film
alignment
If a radiograph is described as "underpenetrated," then the error must be: -
ANSWER-too little kVp
Which of the following is used in the high-voltage circuit? - ANSWER-a step-up
transformer
Ionization occurs: - ANSWER-when an atom loses an electron
Identify the physicist who discovered x-rays: - ANSWER-Roentgen
Examples of particulate radiation include: - ANSWER-alpha particles
electrons
neutrons
The difference in the electromagnetic spectrum between x-rays and visible light lies
in the: - ANSWER-wavelength
All of the following are properties of x-rays EXCEPT: - ANSWER-x-rays travel in
wavy lines
Identify the particles that compose the nucleus of an atom: - ANSWER-protons
neutrons
The target or focal spot in the x-ray tube can be found at the: - ANSWER-positively
charged anode
Identify the metal used in the focal spot of the x-ray tube: - ANSWER-tungsten
The total x-ray energy produced by the collision of the electrons with the target inside
the x-ray tube is approximately: - ANSWER-less than 1%
Radiation damage to somatic cells in _____ passed on to succeeding generations. -
ANSWER-not
The output of a dental x-ray machine is expressed in _________. - ANSWER-
roentgen/sec
, The quality factory in measuring x-radiation is _____. - ANSWER-one
Radiographs taken to confirm that procedures have been completed are called
___________. - ANSWER-administrative radiographs
Presently the maximum permissible dose (MPD) for dental workers with ionizing
radiation is _________ - ANSWER-5000 /yr
It is predicted that the MPD will ____ be reduced in the near future. - ANSWER-not
Mechanical timers are usually inaccurate by at least a ____ second. - ANSWER-1/4
Panoramic films are ______ sensitive to darkroom light than intraoral film. -
ANSWER-more
If the developing time is 5 minutes, then the fixing time should be approximately
_________. - ANSWER-10 mins.
A clear film can be caused by __________ or ________. - ANSWER-no exposure
prolonged fixing
Defective film hangers should be disposed of because they can cause
___________. - ANSWER-scratches on the film
The protective coating on the emulsion is softened by the ________and hardened by
the ______. - ANSWER-developer
fixer
Although it does not get much publicity, __________ is the greatest health risk for
dental health care workers. - ANSWER-hepatitis
Anything one touches after working in the patient's mouth is considered to be
__________. - ANSWER-contaminated
Infection control procedures should be followed for ______ patients. - ANSWER-all
HBV and HBC are acronyms for types of the _________ virus. - ANSWER-hepatitis
Soaps for hand washing in the dental operatory should be ________. - ANSWER-
antiseptics
A litigious society is one whose members are likely to ___________ the dentist. -
ANSWER-bring suit against
The third party payers should not request ___________ from the dentist. -
ANSWER-administrative/post up radiographs
Original radiographs should _______ be kept in the dental office. - ANSWER-always
