Radiographic Imaging and Instrumentation
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Questions and Answers

Which one of these is the correct equation for calculating the grid ratio?

  • Grid Ratio = h/D (correct)
  • Grid Ratio = h x D
  • Grid Ratio = h - D
  • Grid Ratio = D/h

    • What does the grid frequency refer to?

  • The ability of the grid to remove scatter and improve contrast
  • The ratio of height to width of interspaces
  • The number of radiopaque strips per unit length (correct)
  • The percentage of photons that interact with the lead on the surface

    • What does the grid surface X-ray absorption represent?

  • The width of the interspace
  • The width of the grid septa
  • The mass per unit area of the grid
  • The percentage of photons that interact with the lead on the surface (correct)

    • What is the formula for calculating the bucky factor?

    <p>Bucky Factor = non-grid mAs x bucky factor</p> Signup and view all the answers

    According to the text, what is the formula for the Inverse Square Law?

    <p>I₁/ I₂ = d₂² / d₁²</p> Signup and view all the answers

    According to the text, what is the formula for the Direct Square Law?

    <p>mAs1 = mAs₂ x d₁² / d₂</p> Signup and view all the answers

    What is the impact of scatter on image contrast?

    <p>Decreases image contrast</p> Signup and view all the answers

    Which one of these is the correct equation for calculating the inverse square law?

    <p>$I_1 = (d_2 / d_1)^2 * I_2$</p> Signup and view all the answers

    What is the impact of scatter on image contrast?

    <p>Scatter decreases image contrast</p> Signup and view all the answers

    How would scatter impact AEC function?

    <p>Scatter would cause overexposure in the image</p> Signup and view all the answers

    According to the text, what is the formula for calculating the grid ratio?

    <p>Grid Ratio = h/D</p> Signup and view all the answers

    What is the formula for calculating the lead content of a grid?

    <p>Lead content = mass per unit area</p> Signup and view all the answers

    What is the formula for calculating the percentage of grid surface X-ray absorption?

    <p>% Grid Surface X-Ray Absorption = width of grid septa/(width of grid septa + interspace width) x 100</p> Signup and view all the answers

    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?

    <p>70kVp @ non-grid mAs x bucky factor = 5mAs x 2 = 10mAs</p> Signup and view all the answers

    Which one of these interactions is the predominant interaction of x-rays in the diagnostic energy range with soft tissue?

    <p>Compton Scattering</p> Signup and view all the answers

    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?

    <p>Photoelectric Effect</p> Signup and view all the answers

    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?

    <p>Coherent Scattering</p> Signup and view all the answers

    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?

    <p>Pair Production</p> Signup and view all the answers

    Which interaction between high energy photon and the nucleus is relevant to diagnostic imaging?

    <p>Compton scattering</p> Signup and view all the answers

    What is the formula for calculating the probability of a photoelectric effect interaction?

    <p>P.E. = Z^3/E^3</p> Signup and view all the answers

    What happens to the number of Compton and photoelectric interactions when the energy of the x-ray photon is doubled?

    <p>The number of Compton interactions doubles and the number of photoelectric interactions halves.</p> Signup and view all the answers

    What is the threshold energy for pair production?

    <p>1.02 MeV</p> Signup and view all the answers

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