Protection of Patients Week 3 Flashcards
Two principal factors that reduce patient dose using beam restriction
Kilovoltage and Irradiated materials
What will allow fewer photons to be emitted and fewer scatter photons created?
Using the smallest collimation field possible.
Three beam limiting devices
Aperature diaphragms, cones, collimators
What is the best beam limitation of a cone/cylinder?
When it is long and the diameter of the hole is small
What is the most commonly used and versatile beam limitation device?
Collimators
What is the advantages of filters?
They absorb low energy, long wavelength photons which improves quality of the beam
2 types of filterations
inherent (built in) and Added (added to the design as increased filtration)
Measure of the total filtration when using over 70 kVp
2.5 mm Al
Gonadal shield best used in sterile field procedure
Shadow shield
3 types of gonadal shields
Flat Contact, Shadow, Shaped contact
Procedure that produces the greatest radiation exposure in diagnostic radiography
Fluoroscopic
In CR imaging what parameters are recoverable, preventing retakes
Overexposure up to 500% or underexposure up to 80%
Accurate and effective in reducing patient dose
Patient positioning
A way to ensure against irradiating a woman in the early stages of pregnancy
Institute elective scheduling for non emergency procedures
Causes of repeat radiographs
dirty screens, incorrectly loaded cassettes, light leaks, chemical fog, processor artifacts