Flashcards in CH.3 Deck (25):
the amount of energy absorbed by the patient per unit mass is referred to as:
the highest energy level of photons in the x-ray beam "quality"
the product of electron tube current and the amount of time in seconds that the x-ray tube is activated "quantity" (controls density/dose)
If an interaction occurs, electromagnetic energy is transferred from the x-rays to the atoms of the patient's biologic material. This process is called?
When an x-ray beam passes through a patient, it goes through a process called:
slowing down or diminishing the x-ray photon/beam energy/intensity is called:
Two types of transmission?
Direct and Indirect
when primary x-rays go through the patient without interacting is called:
x-ray photons that are deflected or scattered with potential loss of energy is called:
____ ____ is the x-ray photon beam that emerges
from the x-ray tube and is directed toward the image
Attenuation refers to both:
scatter and absorption
Several methods have been devised to limit the effects of indirectly transmitted x-ray photons. The most common methods include:
1. Air gap technique
2. Radiographic grids
Air gap technique and radiographic grids are ways to reduce ____
Only 2 photons emerge from the tissue and strike the IR below it. They are referred to as:
exit, or image-formation photons
bending of the its path
____-____ _____ degrades the appearance of a completed radiographic image by blurring the sharp outlines of dense structures
Before the four photons produced by the x-ray source enter human tissue, they are referred to as:
five types of interactions between x-radiation and matter are:
1. Coherent scattering
2. Photoelectric absorption
3. Compton scattering
4. Pair production
what 2 interactions between x-radiation and matter are important in diagnostic imaging?
Compton and Photoelectric absorption
interaction between x-ray and inner-shell electron; the electron is ejected and called a photoelectron.
Other terms for coherent scattering
Pair production is important in ____ radiology
Photodisintegration is important in ____ scans