Radiology Quiz 1 Pt. 2 Flashcards
What are short wavelengths? (AKA)
AKA hard wavelengths
High penetrating power, high frequency and high energy
Ex: X-rays and ultraviolet light
What are long wavelengths? AKA
AKA Soft X-rays
Low penetrating power, low energy, and low frequency
Ex: tv/radio/radar
What is primary radiation?
X-rays produced at target, exits the PID and strikes the patient
What is secondary radiation?
Interaction of the primary radiation with matter and the PTs face, less penetrating than primary radiation
Scatter radiation
Form of secondary radiation (deviation of X-rays)
What is thermionic emission effect and where does it occur?
Occurs when tungsten filament boils off/creates electrons
What is the bremsstrahlung effect, and where does it occur?
Occurs when electron cloud(stream) strikes tungsten target and electrons turn into protons (raw radiation)
What is density?
Degrees of blackness of film (mA controls “quantity”)
What is contrast?
Differences in the degree of blackness “quality”
Kvp controls contrast/shades of gray
What is a penumbra and how does it occur?
The unsharpness or blurring that surrounds the edges of a radiographic image
Patient/film/pid movement
What is the step wedge test, and what is it used to test?
Measures density and contrast
Short scale and long scale of contrast
What is h2o2 and why is it dangerous to the cells in the human body?
Aka hydrogen peroxide
Causes poisoning of tissues
Ex: erythema - reddening of the skin
What is safe distance for operator to take X-rays?
6ft or 1.83m
How many X-rays make up the standard fmx?
18-20
Anterior - 6-8
Posterior - 8
Bmx - 4
What is the molybdenum focusing cup and where is it found?
Directs electrons across tube, found in cathode/tungsten filament
