Capturing the Digital image: CR and DR
46 Comprehensive Questions
A CR phosphor plate should be erased prior to use if it has been in storage and accumulating
background radiation for more than: - ✔ ✔ 2 days
Which of the following affect the conversion efficiency of a CR phosphor plate: - ✔ ✔ the chemical
compound used as a phosphor
Which of the following has the highest DQE, at 77%: - ✔ ✔ indirect-conversion DR plates
Which of the following increase the absorption efficiency of a CR phosphor plate: - ✔ ✔ ALL
thicker phosphor layer
phosphor compounds with high atomic numbers
compounds that take advantage of the k-edge effect
In a DR image receptor, most of the square area of each del is dedicated to what portion of the detector
element: - ✔ ✔ the semiconductor layer
In a DR image receptor, smaller dels have a: - ✔ ✔ lower fill-factor
In a DR image receptor, which electronic devices directly account for the plate's ability to hold onto a
latent image until it is sent into the computer? - ✔ ✔ the capacitors
In an individual DR detector element (del), the electronic charge built up on the capacitor is positive
charge because it is generated by drifting downward through the semiconductor layers to the capacitor:
- ✔ ✔ charge holes
A photomultiplier tube is incorporated into the CR reader in order to: - ✔ ✔ amplify and covert
visible light into a measurable electronic signal
A reflective backing in a CR phosphor plate improves its: - ✔ ✔ emission efficiency
During x-ray exposure of a CR phosphor, within its molecular structure what do the meta-stable F
centers do? - ✔ ✔ trap excited electrons
For a CR image receptor plate, which of the following chemicals makes a good photostimulable
phosphor: - ✔ ✔ barium fluorobromide
46 Comprehensive Questions
A CR phosphor plate should be erased prior to use if it has been in storage and accumulating
background radiation for more than: - ✔ ✔ 2 days
Which of the following affect the conversion efficiency of a CR phosphor plate: - ✔ ✔ the chemical
compound used as a phosphor
Which of the following has the highest DQE, at 77%: - ✔ ✔ indirect-conversion DR plates
Which of the following increase the absorption efficiency of a CR phosphor plate: - ✔ ✔ ALL
thicker phosphor layer
phosphor compounds with high atomic numbers
compounds that take advantage of the k-edge effect
In a DR image receptor, most of the square area of each del is dedicated to what portion of the detector
element: - ✔ ✔ the semiconductor layer
In a DR image receptor, smaller dels have a: - ✔ ✔ lower fill-factor
In a DR image receptor, which electronic devices directly account for the plate's ability to hold onto a
latent image until it is sent into the computer? - ✔ ✔ the capacitors
In an individual DR detector element (del), the electronic charge built up on the capacitor is positive
charge because it is generated by drifting downward through the semiconductor layers to the capacitor:
- ✔ ✔ charge holes
A photomultiplier tube is incorporated into the CR reader in order to: - ✔ ✔ amplify and covert
visible light into a measurable electronic signal
A reflective backing in a CR phosphor plate improves its: - ✔ ✔ emission efficiency
During x-ray exposure of a CR phosphor, within its molecular structure what do the meta-stable F
centers do? - ✔ ✔ trap excited electrons
For a CR image receptor plate, which of the following chemicals makes a good photostimulable
phosphor: - ✔ ✔ barium fluorobromide
