Card Set Information
Who discovered x-rays
Original radiographs are property of?
Radiographic imaging technique that images an isolated "slice" of tissue while blurring out other structures
Computed tomography (CT)
Produced when high speed electrons are stopped or slowed down by the tungsten atoms of the dental x-ray tube
5 Major components of the x-ray machine
2.Milliampere (mA) selector
3.Kilovolt peak (kVp)selector
Shadow casting principles (list 5)
1. small focal point
2. long target-object distance
3. short object image receptor
4. Parallel relationship between object and image receptor
5. perpendicular relationship between the central ray of the x-ray beam and both the object and the image receptor
Greek name for periapical?
peri (for around)
legal dose of radiation?
50/30 est. 4.5 grays
Film that is placed in the oral cavity for exposure?
intraoral dental film
Designed for use outside the mouth?
Radiographer have patient hold the film? true/false
Developer contains hydroquinone and Elon? true/false
Bitewing does not capture crown to root tip? true/false
During a PA film packet should be facing?
incisal edge of the tooth
Paralleling technique is the preferred technique? true/false
Processing chemicals cannot be used indefinitely? true/false
X-rays travel at the speed of sound? true/false
Electricity is defined as electrons in motion? true/false
A small focal spot reduces the size of the penumbra? true/false
The film should be enclosed physical contact with the intensifying screen? true/false
Often called Compton scattering, is similar to the photoelectric effect in that the dental x-ray interacts with an orbital electron and ejects it?
Amounts for about 60% of the interactions of matter with the dental x-ray beam?
Increasing the dose of radiation is the recommended method to make up for weak processing? true/false
Only use standard protocol if patient is infected? true/false
Life of processing solutions can be extended by replenishing? true/false
Distortion of the radiographic image in which the tooth structures appear longer than the anatomical size; often caused by insufficient vertical angulation of the central beam?
Distortion of the radiographic image in which the tooth structures appear shorter than their actual anatomical size; most often caused by excessive vertical angulation of the central beam?
Laws vary from state to state on what DA can do with x-rays? true/false
Image the apices of the teeth and the surrounding bone (the entire tooth, including the root end and surrounding bone)?
Size 2 film is most popular for PA's (size 1 is acceptable)? true/false
Shows whole mouth and surrounding structures (entire view)?
Name of device that directs beam towards the patient?
What is the speed of a wave called?
Wavelengths used in diagnostic dental radiography range from 0.1 to 0.5 A; radiation with great penetrating power?
Is the yoke in the extension arm insulated? Y/N
Measures the number of electrons that move through a conductor; unit of quantity of electric current?
What is radiographic density?
What is penumbra?
fuzziness (partial shadow around the objects of interest)
Can radiation cause changes to genetic material of cells? Y/N
Bisecting technique or paralleling technique?
Absorbing material, usually aluminum, placed in the path of the beam of radiation to remove a high percentage of low energy (longer wavelength) x-rays?
The invisible image produced when the film is exposed to x-ray photons; during radiation exposure x-rays strike and ionize some, but not all, of the silver halide crystals?
What is placed in the film package to absorb scatter radiation?
What size of the film faces the radiographer?
Name the 4 components of the dental x-ray film?
1. Film base
4. protective layer
Which processing solution prevents further film development?
4. eye wear
All patients have the legal right to make choices about the health care they receive; includes the right to refuse treatment?
What are the units used to describe the angulation?
How many films are used in a full mouth?