Chapter 6 Flashcards
What is the purpose of aluminum filtration?
To absorb the less penetrating long wavelengths to reduce radiation exposure.
What effect does a less divergent x-ray beam have?
It creates a smaller diameter of exposure.
Which option results in the greatest reduction in radiation the patient receives?
Rectangular PIDs
Rectangular PIDs reduce patient radiation dose by 70 percent.
Which of the following protects the radiographer from radiation except one?
Wearing a personnel monitoring device.
What can a personnel monitoring device not do?
Protect the operator from receiving radiation.
Is the best way to reduce patient risk from radiation exposure to follow ALARA principles?
TRUE
Have guidelines for deciding when, what type, and how many radiographs to expose been developed?
TRUE
Does a rectangular PID expose more radiation to the patient’s face compared with a circular PID?
FALSE
Will pure aluminum hinder the passage of high-energy x-rays?
TRUE
Does fast film require less radiation for exposure?
TRUE
Is increasing the dose of radiation a recommended method to compensate for weak processing solutions?
FALSE
Do thermoluminescent dosimeters (TLDs) contain crystals that absorb energy when exposed to radiation?
TRUE
What is the maximum permissible dose (MPD) for oral health care professionals?
50 mSv/year.
Are medical, dental, and therapeutic radiation included in the MPD?
FALSE
Do regulations governing the use of radiation-producing equipment include federal, state, and some local laws?
TRUE
Has the United States Nuclear Regulatory Commission developed dose limits for radiographers and patients?
TRUE
What principle is called ‘ALARA’?
The principle to keep exposure down, based on the idea that all radiation may cause adverse biological effects.
Is the maximum diameter for the intraoral x-ray beam collimated to 3.75 inches at the patient’s skin?
FALSE
Should the patient hold the PID stable if the tube head support arm drifts during exposure?
FALSE
Is it possible that an undiagnostic radiograph may not need to be retaken if the area of interest is imaged correctly on an adjacent radiograph?
TRUE
Should the bisecting technique be the radiographer’s first choice in exposing periapical radiographs?
FALSE
How often should an adult recall patient with no risk factors for caries be assessed for bitewing radiographs?
Every 24 to 36 months.
How often should a child recall patient with several risk factors for caries be assessed for bitewing radiographs?
Every 6 to 12 months.
Does a high level of caries experience increase a patient’s risk for future caries?
TRUE
Are high-energy x-rays the most harmful to the patient?
FALSE
Which intraoral technique should be the radiographer’s first choice when exposing periapical radiographs?
Paralleling technique.
What undesirable effect does collimation reduce?
Scatter (secondary) radiation.
What part of the x-ray machine absorbs long wavelength, less penetrating x-rays?
Filter.
What is the term for the sum of inherent and added filtration?
Total filtration.
What protects the radiographer against scatter radiation?
Structural shielding.
What are the three categories of methods for protecting oral health care personnel from radiation exposure?
Time, distance, and shielding.
Why do some dental x-ray machines appear to have a short PID?
The tube is recessed behind the transformers in the tube head.
Should the patient wear a thyroid collar during panoramic radiography?
No.
What film speed is recommended to reduce radiation exposure?
F speed film.
Should image receptor holding devices be recommended to reduce radiation exposure?
Yes.
