22 Questions
Which one of these is the correct equation for calculating the grid ratio?
Grid Ratio = h/D
What does the grid frequency refer to?
The number of radiopaque strips per unit length
What does the grid surface X-ray absorption represent?
The percentage of photons that interact with the lead on the surface
What is the formula for calculating the bucky factor?
Bucky Factor = non-grid mAs x bucky factor
According to the text, what is the formula for the Inverse Square Law?
I₁/ I₂ = d₂² / d₁²
According to the text, what is the formula for the Direct Square Law?
mAs1 = mAs₂ x d₁² / d₂
What is the impact of scatter on image contrast?
Decreases image contrast
Which one of these is the correct equation for calculating the inverse square law?
$I_1 = (d_2 / d_1)^2 * I_2$
What is the impact of scatter on image contrast?
Scatter decreases image contrast
How would scatter impact AEC function?
Scatter would cause overexposure in the image
According to the text, what is the formula for calculating the grid ratio?
Grid Ratio = h/D
What is the formula for calculating the lead content of a grid?
Lead content = mass per unit area
What is the formula for calculating the percentage of grid surface X-ray absorption?
% Grid Surface X-Ray Absorption = width of grid septa/(width of grid septa + interspace width) x 100
What factors should be used when imaging a knee with a grid that has a bucky factor of 2, if the non-grid technique uses factors of 70kVp at 5mAs?
70kVp @ non-grid mAs x bucky factor = 5mAs x 2 = 10mAs
Which one of these interactions is the predominant interaction of x-rays in the diagnostic energy range with soft tissue?
Compton Scattering
Which one of these interactions occurs when an incident photon interacts with an inner shell electron and the energy of the incident photon is slightly greater than the binding energy of the electron?
Photoelectric Effect
Which one of these interactions involves the incident photon interacting with a single electron, causing the electron to vibrate or oscillate, and the scattered photon having the same energy and wavelength as the initial photon but traveling in a slightly different direction?
Coherent Scattering
Which one of these interactions occurs when an incident photon interacts with the whole atom, causing excitation of all electrons, and the scattered photon has very low energy in the range of 15 to 30 keV?
Pair Production
Which interaction between high energy photon and the nucleus is relevant to diagnostic imaging?
Compton scattering
What is the formula for calculating the probability of a photoelectric effect interaction?
P.E. = Z^3/E^3
What happens to the number of Compton and photoelectric interactions when the energy of the x-ray photon is doubled?
The number of Compton interactions doubles and the number of photoelectric interactions halves.
What is the threshold energy for pair production?
1.02 MeV
Test your knowledge on radiographic imaging and instrumentation with this housekeeping test. Covering topics such as beam controlling devices, scatter, grids, and the inverse square law, this test will challenge you with a mix of short answer and multiple-choice questions. Get ready to demonstrate your understanding of radiographic imaging principles.
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