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X Ray Tube 147

Part 2

QuestionAnswer
Rotor- Ferromagnetic metal cylinder (Copper & iron) attached to target
Stator- Motor with electromagnetic windings
The _______ Activates a magnetic field when the prep button (rotor switch) is depressed Stator
The _______ Rotates to align with changing magnetic poles of the stator when prep button depressed Rotor
What is the Area where electrons strike the anode and X-Rays are produced? Focal Spot
_______ is used in Dental Radiography Stationary Target
_________ have a Greater Area exposed to electrons and Withstand Higher Heat Loads Rotating Targets
Large Focal Spot- Large or Higher exposures
Small Focal Spot- Better image detail (resolution)
Physical area of the focal track that is impacted Size projected is the same size as the filament selected Actual Focal Spot
Measured directly under anode; Size projected on pt and IR Stated focal spot size Effective Focal Spot
________ (5-20 degrees) Determines effective focal spot size Anode Angle
The Anode Angle Allows the effective focal spot to be ______ than the actual focal spot Smaller
________ Provide better resolution and Endures great heat loads Smaller Effective Focal Spots
Radiation intensity is Less on the Anode side because x-rays are _______ Attenuated
Increase in focal spot size caused by electrostatic repulsion Blooming
X-rays produced away from focal spot (X-rays go outside of EFS size and expose unnecessary areas of the patient) Off-Focus Radiation
Primary interaction of x-ray production Heat
What is the purpose of the X-Ray tube warm up procedures? Extends the life of the x-ray tube by preventing damage such as anode cracking
X-Ray tube warm up procedures are performed at the beginning of the day and/or when the tube has not been used in_______ Two Hours
Typical X-Ray Tube warm-up procedure- – Two exposures – Technique: 70 kVp; low mA; 0.5 – 2 seconds
Radiographic Tube Rating Charts Purpose- Determines the maximum technical factor combination allowed without overloading the tube
Radiographic Tube Rating Chart X-Axis- Time (in seconds)
Radiographic Tube Rating Chart Y-Axis- kVp
Radiographic Tube Rating Chart Curve- mA station
Any technique _______is safe Under The Curve
Anode & Housing Cooling Curves Used to determine the amount of time needed for the anode or housing to completely cool down May also be used to determine how much cooling time is needed prior to making additional exposures
Anode & Housing Cooling Curves X-Axis Time (in minutes)
Anode & Housing Cooling Curves Y-Axis Heat Units (as calculated)
Heat Units- Used to measure the amount of heat generated by specific technique factors
Single Phase Formulae: mA × time × kVp
Three Phase, Six Pulse Formulae: mA × time × kVp × 1.35
Three Phase, Twelve Pulse Formulae: mA × time × kVp × 1.41
High Frequency Formulae: Is the same as Three Phase, Twelve Pulse (Used to be x 1.45)
Created by: user-2016295
 

 



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