Unit #1
What is the location in which thermionic emission occurs?
Negative cathode
What is the tissue that is most susceptible to radiation?
Blood-forming tissue
What was the first "wireless" sensor in digital imaging?
PSP
What is the marked prominence of bone found on the anterior superior ramus of the mandible?
Coronoid process
What type of radiograph would you take if you suspect periodontal disease in the molar region?
Periapical--best answer
Vertical bitewing--good answer
What is used to increase the voltage in the high-voltage circuit?
Step-up transformer
What exposure is the inverted "typical Y" formation observed?
Maxillary canine
Which positioning error occurred in a panoramic radiograph if the right premolars appear widened and are overlapped, whereas the left premolars appear narrowed with the contacts open?
The patient's head was twisted or turned
What is the wing shaped bony projection of the sphenoid bone?
The lateral pterygoid plate
What is the maximum permissible whole-body dose of radiation for dental personnel?
50mSv (5rem) per year
What is the location in which x-rays are produced?
Positive anode
What injuries do not appear in the person irradiated but occur in future generations?
Genetic effects
What is the collimator in panoramic radiography?
A lead plate with an opening in the shape of a narrow vertical slit.
What structure may be seen on a maxillary molar periapical behind the 3rd molar area?
Maxillary tuberosity
What is the recommended minimum distance that the operator should stand from the source of radiation?
6 ft (1.83m)
What type of electrical charge does the electron carry?
Negative charge
How are cells with a high reproductive rate described?
Radiosensitive
What is the radiographic technique for evaluation of the maxillary sinuses?
Waters view
What is a long, thin, pointed process below the external auditory meatus?
Styloid process
What does a film that has not been exposed to x-rays look like?
Clear
What is an x-ray photon?
A small bundle of pure energy with wave-like properties.
What term is used to describe the dose of radiation that the body can endure with little or no chance of injury?
Maximum permissible dose
What do panoramic radiographs have less of?
Less detail, or resolution, than periapicals or bitewings.
What consists of bone and cartilage , separates the nasal cavity into the two halves?
The nasal septum
What is the recommended distance between the darkroom safelight and the working surface?
4 feet