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Radiology NBDE Part 2 Exam With Complete Solutions
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Radiology NBDE Part 2 Exam With Complete SolutionsIf no barrier, how far does the dentist need to be for protection?
6 feet, 90-135 degrees
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
-Prevent rust
-Reduce radiation
-Dissipate heat to the target
-Lubricate
Dissipate heat to the target
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 operator when taking x-rays?
-Radiation left in the air
-Scatter from the patient
-Scatter from the walls
-Leakage from the x-ray head
Scatter from the patient
In performing normal dental diagnostic procedures, the operator receives the greatest
hazard from which type of radiation?
A. Direct primary-beam
B. Secondary and scatter
C. Gamma
B. Secondary and scatter
What characterizes secondary radiation?
Coming off the matter
What is the max radiation dosage for a dental professional per year?
, 50msv/year or 5 rem/year
- Per month = 4 msv, per week = 1 msv
Filaments
Heat is produced in the X-ray.
Digital image: which is the digital detector?
Charge coupled device
MRI utilizes what electromagnetic wave?
Radiowaves
COLLIMATION
What does collimation do?
The x-ray beam size/diameter & volume of irradiated tissue is reduced, area of exposure
is reduced
-usually with circle diameter of 2.75 in
Collimator function is all but:
To increase the radio-graphic contrast is not a function of the collimator.
Penetrability - increase
Collimation in x-rays
Reduces low energy radiation
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