DHYG 1304 FINAL EXAM REVIEW (RADIOLOGY)
Radiographs are the images produced and the main purpose is for ____________ -
Answer -diagnosis
Who discovered x-rays? - Answer -William Conrad Roentgen
What year was the x-ray discovered? - Answer -1895
What is the goal of a radiograph? - Answer -to produce the highest quality radiographs
while maintain the lowest possible radiation exposure risk for the patient.
What are the advantages of a digital image receptor? - Answer --reduction in radiation
dosage.
-elimination in film and processing chemistry.
-elimination of film packaging disposal.
Panoramic radiography - Answer --capable of exposing the entire dentition and
surrounding structures on a single image.
What year was the panoramic radiography introduced? - Answer -1948
What year did the panoramic became popular? - Answer -1960
Focal trough - Answer --anterior & posterior
-superior & inferior: ala-tragus line and Frankfurt line.
-lateral: midsagittal plane.
What are the parts of the x-ray tube head? - Answer -anode and cathode
Cathode - Answer --is negative
-the filament is composed of tungsten wire
-the focusing cup is composed of molybdenum
Anode - Answer --is positive
-its made of copper stem and tungsten target
- its purpose is to provide a target stop or to significantly slow the high-velocity electron.
What are the conditions for x-ray production? - Answer --source of free electrons
-high voltage to impart speed.
-target capable of stopping them.
The smaller the focal spot the ____________________ the image. - Answer -sharper.
Filtration is composed of: - Answer -aluminum
, Collimator - Answer -is rectangular and made out of lead.
PID - Answer -it can be rectangle and is 16 inches.
Atoms are composed of: - Answer -electrons, protons, neutrons
Electrons: - Answer -negative charge
Protons - Answer -positive charge
Neutrons - Answer -no charge
Atom - Answer -smallest particle of an element that still retains the properties of the
element
Electrons revolve around a nucleus in path called _________ or _________. - Answer -
shells or energy levels.
Binding energy - Answer -electrons are maintained in orbits by positive attraction of
protons.
What are the dental x-ray machine components? - Answer --control panel
-extension arm
-tube head
What does the control panel contains? - Answer --line switch (on/off)
-ma selector
-kvp selector
-Timer
-Exposure button
Milliamperage (ma) is defined as: - Answer -quantity, number & amount.
Kilovolatage (kvp) is defined as: - Answer -quality, speed, penetrating & ability.
On the timer how many impulses per second does it make? - Answer -60
How many do you need to be when you are exposed to radiation? - Answer -6ft. Away
Is the form of energy: - Answer -electricity
Filament circuit: - Answer -Provides low voltage (3-8V) to the filament of the x-ray tube
to provide the source of electrons needed for the production of x-rays.
Radiographs are the images produced and the main purpose is for ____________ -
Answer -diagnosis
Who discovered x-rays? - Answer -William Conrad Roentgen
What year was the x-ray discovered? - Answer -1895
What is the goal of a radiograph? - Answer -to produce the highest quality radiographs
while maintain the lowest possible radiation exposure risk for the patient.
What are the advantages of a digital image receptor? - Answer --reduction in radiation
dosage.
-elimination in film and processing chemistry.
-elimination of film packaging disposal.
Panoramic radiography - Answer --capable of exposing the entire dentition and
surrounding structures on a single image.
What year was the panoramic radiography introduced? - Answer -1948
What year did the panoramic became popular? - Answer -1960
Focal trough - Answer --anterior & posterior
-superior & inferior: ala-tragus line and Frankfurt line.
-lateral: midsagittal plane.
What are the parts of the x-ray tube head? - Answer -anode and cathode
Cathode - Answer --is negative
-the filament is composed of tungsten wire
-the focusing cup is composed of molybdenum
Anode - Answer --is positive
-its made of copper stem and tungsten target
- its purpose is to provide a target stop or to significantly slow the high-velocity electron.
What are the conditions for x-ray production? - Answer --source of free electrons
-high voltage to impart speed.
-target capable of stopping them.
The smaller the focal spot the ____________________ the image. - Answer -sharper.
Filtration is composed of: - Answer -aluminum
, Collimator - Answer -is rectangular and made out of lead.
PID - Answer -it can be rectangle and is 16 inches.
Atoms are composed of: - Answer -electrons, protons, neutrons
Electrons: - Answer -negative charge
Protons - Answer -positive charge
Neutrons - Answer -no charge
Atom - Answer -smallest particle of an element that still retains the properties of the
element
Electrons revolve around a nucleus in path called _________ or _________. - Answer -
shells or energy levels.
Binding energy - Answer -electrons are maintained in orbits by positive attraction of
protons.
What are the dental x-ray machine components? - Answer --control panel
-extension arm
-tube head
What does the control panel contains? - Answer --line switch (on/off)
-ma selector
-kvp selector
-Timer
-Exposure button
Milliamperage (ma) is defined as: - Answer -quantity, number & amount.
Kilovolatage (kvp) is defined as: - Answer -quality, speed, penetrating & ability.
On the timer how many impulses per second does it make? - Answer -60
How many do you need to be when you are exposed to radiation? - Answer -6ft. Away
Is the form of energy: - Answer -electricity
Filament circuit: - Answer -Provides low voltage (3-8V) to the filament of the x-ray tube
to provide the source of electrons needed for the production of x-rays.
