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RAD TECH ASSESSMENT ACTUAL EXAM
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CORRECTLY WELL DEFINED ANSWERS
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Which of the following increases the detective quantum efficiency - ANSWERS- Decreasing the KVP
What does the abbreviation MTF stand for in radiography - ANSWERS- Modulation transfer function
The modulation transfer function evaluates the - ANSWERS-Ability of the system to transfer the information into the image
Modulation transfer function is also referred to as which of the following - ANSWERS-Image Fidelity
Which modulation transfer function score indicates that an image perfectly represents the object in both spatial resolution and contrast - ANSWERS-1.
Which layer of the computed radiography imaging plate is responsible for creating the latent image from the transmitted x-ray photons exiting the patient
The phosphor layer of the computed radiography imaging plate is composed of - ANSWERS-Barium florohalides and Europium Activators
The term latent image is used to describe the - ANSWERS-Stored energy within the fluorohalides
The thin, active layer within the computed radiography cassette stores, which of the following - ANSWERS-Latent image
What is another name for the conductive layer of a computed radiography plate? - ANSWERS-Anti-static layer
An x-ray photon is absorbed within the phosphor layer of a computed radiography plate through what type of interaction - ANSWERS-Photo electric interaction
Which of the following components is not utilized for computed radiography systems - ANSWERS-Developer
Which two of the following materials may be used in the construction of the computed radiography imaging plate outer cassette - ANSWERS-Carbon fiber's, plastic
The conductor layer within the computed radiography imaging plate is responsible for which of the following - ANSWERS-Decreasing electrostatic charge
Which layer of the computed radiography imaging plate prevents unwanted light and background radiation from affecting the unprocessed latent image - ANSWERS-Light shield layer
The most common computed radiography imaging plate reader contains which of the following - ANSWERS-Analog to digital converter, and a focusing lens
What occurs to the imaging play as soon as it is inserted into the computed radiography reader - ANSWERS-The imaging plate is extracted by rollers
Which three of the following components are included an indirect to capture flat panel, digital image detector systems - ANSWERS-Photo diode, scintillation layer, thin-film transistor (TFT) array
Which component of an indirect capture, flat panel detector converts incident, x-ray photons into visible light photons - ANSWERS-Scintillation layer
What happens when a computed radiography imaging plate is exposed to white light - ANSWERS-The imaging plate is erased and can be reused
Which component of an indirect capture, flat panel detector converts the visible light into electrons - ANSWERS-Photo diode
Flat panel detector systems typically use a thin film transistor. This device functions to. - ANSWERS-Collect electrical charge
Which two of the following flat panel detector components can collect and convert light into electrical signal - ANSWERS-Photo diode, and charge coupled device
Which element used in the construction of a flat panel detector is able to convert x-ray photons directly into an electrical system - ANSWERS-Amorphous selenium
Which of the following devices acts as a switch within a flat panel detector to release the electrical charge collected by the detector element - ANSWERS-Thin film transistor
What is the percentage of the detector element devoted to the detection layer called - ANSWERS-Fill factor
The relationship between the fill factor and spatial resolution is - ANSWERS- Directly proportional
Which of the following is created on an image receptor by the arrangement of detector elements into rows and columns - ANSWERS-Matrix
Which of the following would lead to an increase in patient does - ANSWERS- Decreased fill factor
Which of the following will produce the highest spatial resolution - ANSWERS- Large matrix and low pitch
Which of the following makes up the digital matrix of the image file - ANSWERS- Pixels
Within a digital radiography image matrix 1024 x 1024 refers to the - ANSWERS- Number of pixels in the matrix
Which of the listed radiographic matrices will create an image with the smallest pixels - ANSWERS-2048 x 2048
Which of the following radiographic matrices would produce the greatest spatial resolution - ANSWERS-2048 x 2048
Which of the following images was created, using the largest matrix size - ANSWERS-Image (A)
Which two variables are responsible for the difference in spatial resolution demonstrated within each of the following images - ANSWERS-Pixel size in matrix size
Which of the following special frequencies would produce the greatest spatial resolution? - ANSWERS-6.30 lp/mm
Calculate the pixel size given these variables:
Matrix size = 512 x 512
Field-of-View = 12 cm
mA = 5
kVp = 78
0.000046cm
0.023 cm
0.117cm
42cm - ANSWERS-0.023 cm
During digital image formation and processing, quantization takes place in which of the following - ANSWERS-Analog to digital converter
What is the smallest exposure different that can be detected and displayed by the imaging system - ANSWERS-Contrast resolution
Which of the following factors influence the gray scale of a digital radiograph - ANSWERS-Bit depth
Which of the following changes will increase the contrast resolution of a digital radiographic system - ANSWERS-Increase the bit depth
A histogram and digital radiography refers to the - ANSWERS-Bar graph of the distribution of signal intensities
What step in digital image processing identifies the useful exposure values in raw image data - ANSWERS-Histogram analysis
In the following radiographic histogram, what does the X axis represent? - ANSWERS-Specific, signal intensity values from low to high
Which process correct? Slide under exposure or overexposure errors made by the technologist - ANSWERS-Rescaling
A technologist accidentally uses a lower milliampere seconds, then appropriate on a radiograph of the chest. What digital process is used to display the image as if the image receptor was exposed correctly. - ANSWERS-Rescaling
Which process is used to display the digital image with the ideal brightness and contrast - ANSWERS-Look up table adjustments
Which two of the following technologist errors are most likely to result in incorrect histogram rescaling, and look up table adjustments - ANSWERS-Using incorrect collimation and processing a knee radiograph as a chest
Processing a tibia fibula radiograph as an abdomen may result in which of the following - ANSWERS-Incorrect brightness and contrast
Any radiographic histogram, what does the Y axis represent? - ANSWERS- Frequency of specific, signal intensity values
Consider the following scenario you are completing your routine clinical rotation in a radiographic room with digital equipment. You notice that the final digital images do not display exposure indicators, and that the workers only use image brightness to assess whether the image receptor received appropriate radiation exposure. This is poor practice, because - ANSWERS-Brightness does not reflect the amount of radiation the image receptor received
same grids were used for all of the exposures, and the proper technical factors were also utilized for every exam. What is the most likely source of noise for those images? - ANSWERS-System noise
Photons I add information, but do not represent the anatomic structures are considered - ANSWERS-Scatter radiation
Which adjustment is preferred when radiographic grids are used to reduce scatter - ANSWERS-Increase mAs
Signal to noise ratio is increased whenever - ANSWERS-Radiographic grids are utilized
What does the acronym DQE stand for? - ANSWERS-Detective quantum efficiency
Detective quantum efficiency is a - ANSWERS-Score that describes the ability of the imaging system to convert a remnant x-ray beam into a high-quality image
Photon is synonymous with which of the following terms - ANSWERS-Quantum
Out of the following combinations, which two of the following result in an x-ray system, that has a high detective, quantum efficiency - ANSWERS-There is high efficiency in converting the x-ray signal into an image
A lower x-ray signal is required to produce a quality image
When a radiograph has a high detective, quantum efficiency, what combination of noise and signal will be demonstrated? - ANSWERS-High signal and low noise
Detective quantum efficiency is an actual number represented in a percentage. What percentage below would be considered the highest DQE - ANSWERS-80%
Amorphous selenium is a material used in which of the following imaging systems - ANSWERS-Direct digital radiography
Which of the following terms describes the amount of photons that are absorbed by the detector? - ANSWERS-Capture efficiency
Which of the following would decrease the detective, quantum efficiency? - ANSWERS-Increasing the KVP
What units are used to express spatial frequency - ANSWERS-Line pairs per millimeter (lp/mm)
Which of the following line pairs per millimeter selections would represent the highest spatial frequency - ANSWERS-9 LP/MM
Consider an x-ray exposure that results in a receptor exposure of 0.001 micro gray. The resulting images expected to display which of the following - ANSWERS-Quantum mottle
An x-ray exposure above the highest level of the exposure latitude may result in an image era called - ANSWERS-Saturation artifact
Which of the following is the ability to produce quality radiographs at a wide range of technical factors? - ANSWERS-Exposure latitude
A radiographer requires an optimal image of the wrist using 60 KVP and 2. MAS. Acquiring the same projection and using a technique of 72 KVP and 5MAS will result in which of the following. - ANSWERS-Excessive patient dose
Consider this scenario: one radiographer requires an image of the chest using 100 KVP and 2 mAs. A different radiographer requires an image of the chest of the same. Patient using 120 KVP and 2.5 MAS both exposures resulted in exposure indicators that were within the acceptable range and an acceptable patient dose. This is an example of. - ANSWERS-Exposure latitude
Which of the following radiographs was produced, using the lowest exposure setting - ANSWERS-Image (A)
Each of these images was acquired using different mAs but they all produced exposure indicator values that are within the acceptable range. This series of images is an example - ANSWERS-Exposure latitude
