Structure of the Atom
True or False. Electron shells are the hard coating around the electron.
False
In a Tungsten atom, a Bremsstrahlung interaction will occur when the incident electron:
interacts with the force field around the nucleus
An adjustable form of a resistor is the:
rheostat
Shape distortion is caused by
angling the tube and/or angling the patient
The heel effect occurs because of:
X-ray absorption in the anode
If an atom has the same number of electrons and protons, it will:
be electrically neutral
What is produced when an incident electron excites an outer-shell electron?
heat
To avoid damaging the x-ray tube components, the electrical power supplied to the x-ray tube must be:
Direct current
Which of the following technical factors is primarily used to regulate subject contrast?
kVp
Who discovered x-rays?
Wilhelm Roentgen
A negative ion is
an atom with more electrons than protons
How does an increase from 70 kVp to 100 kVp affect the energy of a k-shell characteristic photon ?
no change
Voltage ripple for a high frequency generator is:
1%
What type of relationship does mAs have with exposure reaching the IR?
direct proportional
The number of bits that determine the gray level that can be assigned to a pixel is the
bit depth
Discovery of the electron is attributed to:
Thomson
Which interaction is responsible for producing the most x-ray photons at the x-ray tube target?
Bremsstrahlung
A transformer operates on the principle of:
Electromagnetic induction
A measurement of the efficiency of an image receptor in converting x-ray exposure to a quality image describes:
DQE
Atoms that bind together because of their opposite charges form:
ionic bonds
A compound consists of:
at least 2 elements
A tech is attempting to decrease the beam intensity and decrease penetrability of the beam. The tech should:
decrease kVp
Which type of generator uses multiple sources of alternating current so that the voltage never drops to zero?
Three phase
Which of the following factors affect image contrast?
- Collimation
- Grid ratio
- mAs
- FSS
- Motion
- OID (air gap)
- kVp
- Anode heel effect
- Collimation
- Grid Ratio
- OID (air gap)
- kVp
The N shell can hold _____ electrons.
32