Physics Test 3
X-ray production, detectors, etc.
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What is a typical Bucky factor for an adult abdomen?
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What detector correction should be performed before patient imaging to minimize pixel defects in the radiograph? *
What causes spatial resolution to be lower for a computed radiography (CR) compared to traditional x-ray film?
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What caused the artifact shown in this DR image? *
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What is a typical effective dose for a whole body DEXA scan? *
At what depth in the body do 50% of the x-rays become absorbed? *
What is the magnification factor of a heart in an AP CXR when the detector is 100 cm from the x-ray tube and the heart is 50 cm from the x-ray tube? *
The deviation index (DI) was developed to compare the exposure parameters of a DR image to what? *
What is the primary limitation in radiography when using a small focal spot? *
What aspect of an x-ray examination setup most affects the histogram reconstruction algorithm? *
How does the intensity (I) of the X-ray beam change with Β distance (d) from the X-ray tube? *
What caused the artifact (vertical lines) shown in this DR image? *
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To minimize geometric blurring, where should patient anatomy be placed with respect to the detector? *
If a patient is moved 10 cm farther from the x-ray tube, by what factor do we need to change the mA?
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An incident photon (πœ†1) undergoes what kind of photon interaction depicted in the diagram? *
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Which detector generates the lowest image noise? *
X-ray production efficiency is improved by changing what factor? *
Enter you name (first and last) *
What type of photon interaction dominates in soft tissue? *
In x-ray, what causes the scatter to primary ratio (SPR) to increase? *
What does the the "fill factor" refer to? *
Resident year *
How deep does the X-ray beam need to travel in soft tissue to be reduced by 50%? *
The scatter to primary ratio will be the greatest for what type of x-ray examination?
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What will happen to a radiographic image if you increase the grid frequency? *
An incident photon (πœ†1) undergoes what kind of photon interaction depicted in the diagram? *
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What is the most common reason X-ray tubes fail (i.e., stop working)? *
What would be a typical acquisition technique for an pediatric forearm radiograph? *
When acquiring a radiograph, what is one thing that you can do to minimize patient dose? *
At what depth in the body do 50% of the x-rays become absorbed? *
According to the line focus principle, what is the focal spot size projected onto the X-ray detector compared to the focal spot size projected onto the anode? *
Under what circumstance is image blur the worst?
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What acquisition technique fact will reduce the visibility of ribs in a CXR in an adult? *
Edge blurring is greatest in DR under what situation? *
When improperly selected, what grid parameter will most likely lead to grid cut off artifacts? *
X-ray's are formed in an X-ray tube due to what type of interaction? *
Binding energy is the energy required to what? *
An incident photon (πœ†1) undergoes what kind of photon interaction depicted in the diagram? *
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Which light scintillating material produces the best spatial resolution for a detector? *
A radiograph with a deviation index (DI) value of -3 represents what aspect of the image? *
What is ionization? *
It's important to use an anti-scatter grid w/ a high grid frequency when imaging w/ what type of X-ray detector? *
What is a typical effective dose for a dual view CXA in an adult population? *
When using a grid for portable x-rays, what grid frequency should you select? *
What does the Bucky factor describe in x-ray imaging?
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The exposure index (EI) describes what aspect of a digital radiograph? *
To properly distinguish image contrast (grayscale in the image) in a DR image, what is the recommended minimum ratio of black to white pixel intensity ? *
The Bucky factor describes how much radiation should be increased to account for absorption of primary X-rays by what object? *
Bremsstrahlung is an example of what kind of radiation? *
What type of photon interaction generates characteristic X-rays? *
What is the k-edge of iodine? *
The "quality" of an X-ray beam is defined by what value? *
According to the line focus principle, spatial resolution is best at what side of the X-ray tube? *
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According to the Heel effect, the X-ray beam has the highest intensity at what side of the X-ray tube? *
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What acquisition factor led to the poor bony contrast in the image? *
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