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RAD 156 Week 1

Part 3

QuestionAnswer
Primary Barriers Wall behind the bucky or floor (underneath the table) • 1/16 inch of lead
Secondary Barriers All other walls and the ceiling • 1/32 inch of lead
What Barrier is Most Likely to be hit by Scatter? Secondary Barrier
What Barrier is Most Likely to be hit by the Primary Beam? Primary Barrier
______ Controls the Penetrating Power of the beam kVp
Increasing kVp will _______ the amount of photons produced Slightly Increase
Milliamperes per second = Current
________ Controls the Amount of Photons in the Beam mAs
Quantity of radiation released at a given point Air Kerma
What is Air Kerma? Kinetic Energy Released in Mass of Air
Air Kerma Units J/kg or Gy
Amount of ionizations or charge per unit mass of air Exposure
Exposure Units C/kg or R
1 coulomb = charge of approximately 6.24 × 10¹⁸ electrons
Measure of Charge Coulomb
Exposure is used for Equipment Calibration
Absorbed Dose is used for Estimating Patient Dose
Dose Equivalent is used for Estimating Occupational Dose
Radioactivity is used for Doses in Nuclear Medicine
How does Collimation help the tech? Reduces Scatter Radiation
How does Collimation help the Patient? Smaller area (light field) reduces dose
How does Collimation help the Image? Reduces fog and increases Contrast Resolution
• Patient /part thickness • Surface area • Age • Density of the part • Pathology ^ All help determine kVp & mAs combination
Velocity (v) SI Unit m/s
Acceleration (a) SI Unit m/s²
Force (F) SI Unit N
Work (w) SI Unit J
Power (P) SI Unit Watt
Created by: user-2016295
 

 



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