Radiology NBDE part 2 UPDATED ACTUAL Questions and
CORRECT Answers
When there is no barrier, how far does the 6 feet, 90-135 degrees
dentist need to be for protection?
Most of the x-ray is converted to? Heat
What is the oil in the x ray tube for? Dissipate the heat ( cooling)
Purpose of oil in x-ray tube housing Dissipate heat to the target
-Prevent rust
-Reduce radiation
-Dissipate heat to the target
-Lubricate
Why is there oil in x-ray tube? -For insulation
-Cools off the anode
Thermionic emission where? Cathode ( checked , true)
Kimia Sh Wiki: The classical example of thermionic emission is
the emission of electrons from a hot cathode into a vacuum
- Thermionic emission = electron emission from a heated metal
(cathode). The cathode has its filament circuit that supplies it
with necessary filament current to heat it up.
Something about what is the best x-ray Short wavelength, high energy
, What is primary source of radiation to the Scatter from the patient
operator when taking x-rays?
-Radiation left in the air
-Scatter from the patient
-Scatter from the walls
-Leakage from the x-ray head
In performing normal dental diagnostic B. Secondary and scatter
procedures, the operator receives the
greatest hazard from which type of
radiation?
A. Direct primary-beam
B. Secondary and scatter
C. Gamma
What characterizes secondary radiation? Coming off the matter
What is the max radiation dosage for a 50msv/year or 5 rem/year
dental professional per year? - Per month = 4 msv, per week = 1 msv
Filaments Produces heat in the X-ray.
Digital image: which is digital detector? Charge coupled device
MRI uses what electromagnetic wave? Radiowaves
COLLIMATION
What does collimation do? Reduces x-ray beam size/diameter & volume of irradiated
tissue, reduces area of exposure
- usually with circle diameter of 2.75 in
Collimator function is all but: Increase penetrability
Collimation in x-rays Reduces low energy radiation
Collimation Block (lead)
What the collimator does: Reduce the:
1) volume of tissue being irradiated
2) reduce the amount of scatter radiation by 60%
Collimation does everything except: Reduce average energy of x-rays (energy is unchanged)
-Reduce pt exposure
-Reduce operator exposure
-FiIlm fog
-Reduce average energy of x-rays
Collimating device on the x ray does all Prevents fogging
except:
CORRECT Answers
When there is no barrier, how far does the 6 feet, 90-135 degrees
dentist need to be for protection?
Most of the x-ray is converted to? Heat
What is the oil in the x ray tube for? Dissipate the heat ( cooling)
Purpose of oil in x-ray tube housing Dissipate heat to the target
-Prevent rust
-Reduce radiation
-Dissipate heat to the target
-Lubricate
Why is there oil in x-ray tube? -For insulation
-Cools off the anode
Thermionic emission where? Cathode ( checked , true)
Kimia Sh Wiki: The classical example of thermionic emission is
the emission of electrons from a hot cathode into a vacuum
- Thermionic emission = electron emission from a heated metal
(cathode). The cathode has its filament circuit that supplies it
with necessary filament current to heat it up.
Something about what is the best x-ray Short wavelength, high energy
, What is primary source of radiation to the Scatter from the patient
operator when taking x-rays?
-Radiation left in the air
-Scatter from the patient
-Scatter from the walls
-Leakage from the x-ray head
In performing normal dental diagnostic B. Secondary and scatter
procedures, the operator receives the
greatest hazard from which type of
radiation?
A. Direct primary-beam
B. Secondary and scatter
C. Gamma
What characterizes secondary radiation? Coming off the matter
What is the max radiation dosage for a 50msv/year or 5 rem/year
dental professional per year? - Per month = 4 msv, per week = 1 msv
Filaments Produces heat in the X-ray.
Digital image: which is digital detector? Charge coupled device
MRI uses what electromagnetic wave? Radiowaves
COLLIMATION
What does collimation do? Reduces x-ray beam size/diameter & volume of irradiated
tissue, reduces area of exposure
- usually with circle diameter of 2.75 in
Collimator function is all but: Increase penetrability
Collimation in x-rays Reduces low energy radiation
Collimation Block (lead)
What the collimator does: Reduce the:
1) volume of tissue being irradiated
2) reduce the amount of scatter radiation by 60%
Collimation does everything except: Reduce average energy of x-rays (energy is unchanged)
-Reduce pt exposure
-Reduce operator exposure
-FiIlm fog
-Reduce average energy of x-rays
Collimating device on the x ray does all Prevents fogging
except:
