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procedures

procedures sem1

QuestionAnswer
t or f? To change from film to CR, significant changes must be made to the X-ray generating equipment False
T or f? With a CR system there is no danger of routinely overexposing all patients False
T or f? A digital image is composed of a series of rows and columns known as a matrix True
What digital imaging modality uses a laser to scan the image plate before the radiographic image is acquired by the computer and displayed to a computer monitor? Computed radiography
Digital images are stored by a computer as what? A series of 0s and 1s
Digital radiography detector that is also used in consumer digital cameras and camcorders. A. Selenium detector B. Charged coupling device C. Computed radiography B.
T or F? The thin film transistor (TFT) used with an indirect flat panel detector is the same as the TFT used for a direct detector True
T or F? The photostimulable phosphor stores the energy deposited by the X-ray beam in the plate True
T or F? Flat panel receptors are classified as scintillator based or non scintillator based True
Which of the following is an advantage when viewing a digital image compared to conventional film? A. Wider latitude B. Brightness of monitor is less than a view box C. Monitors need to be replaced A.
Random information within a diagnostic image that detracts from the overall images appearance is known as? A. Contrast B. Detail C. Noise D. Density C.
A neural histogram compares the image data to ____ or more predefined histograms. A. 2 B. 3 C. 4 D. 5 A
How many people can view a digital image on a PACS simultaneously? Unlimited
In what year did the ARC and the NEMA form a joint committee to create a standard process for transmitting medical images? 1982
When was DICOM standard 3.0 published ? 1993
Workstations designated as diagnostic workstations typically are used only by: A. Radiographers B. Medical physicists C. Radiologists D. Physicians C.
Long term storage of digital images occurs in which type of storage system? Archive
A benefit of installing PACS software on computers throughout the medical facility is increased: A. Image detail B. Viewing functionality C. Access D. Image size C.
Prefetching generally occurs at what time of the day? A. The start of the work day B. During the lunch hour C. During the night C
A computer network limited to a relatively small geographical area is known as: A. LAN B. WAN C. STAN D.GAN A
An advantage of LCD monitors over CRT monitors is that LCD monitors: A. Are more durable B. Lower measurable black levels C. Have less screen glare C
_______ refers to continuously verying quantity; a ______ system uses only two values that vary discretely through coding. Analog, digital
Computer _____ are the software of the computer. Programs
To encode is to translate from ordinary characters to computer compatible characters - ______ _______. Binary digits
The electronic circuitry that does the actual _______ and the memory that supports this together are called the _______. Computation, processor
Main memory is the _______ storage of a computer. Working
Output hardware consists of ______ that translate computer information into a form that humans can understand Devices
Input hardware converts ________ into a form that the computer can use. Data
Scanning the bar code on a PSP plate is extremely important because it links the image data with the correct _______. Patient
Which device allows for an increased scanning precision compared with a mechanical arm? Rotating mirror
In a PSP plate reader, the light guide collects the light and directs it into a _______. Photomultiplier tube
PSP plates are erased after processing by exposing the plate to: High intensity light
When using a flat panel detector, the technologist does not touch the : Image detector
In a flat panel imaging system, electrons are converted into digital values by an: ADC
What do both a charge-coupled device and a complementary metal oxide semiconductor need to change X-rays into light? A scintillator
What happens when a PSP plate reader is unable to identify the collimated borders of the image? The image quality is poor
A graphical representation of exposure values extracted from an image receptor is known as: Histogram
Visual cues that an image has been overexposed are not easily seen in digital radiography because of: Rescaling
If a PSP plate is processed using the wrong anatomical menu, what could happen? The El number might display improperly
All of the following are advantages to digitizing radiographs except: A. It allows radiologists to view images in new ways B. It provides electronic access to digitized images C. Artifacts are removed during the process C
The benefits of the needle shape photostimulable phosphor as compared to the powder based PSP is: A. Less light spread B. Greater absorption of radiation for same thickness C. Better resolution D. All the above D.
What is the ideal percentage value for MTF? 100%
T or F? A pixel is a two dimensional representation of a corresponding tissue volume, known as a voxel True
Which digital imaging modality uses a laser to scan the image plate before the radiographic image is acquired by the computer and displayed to a computer monitor? Computed radiography
Viewing an image on a computer monitor, the displayed brightness and contrast are controlled by adjusting the: A. Pixel size B. Window level C. Window width D. B and C D
Which department(s) use a digital format for imaging? A. MRI B. CT C. nuclear medicine D. All the above D.
Eight bits equals ___ byte(s) 1
T or F? To change from film/screen to CR, significant changes must be made to the X-ray generating equipment False
T or F? It is impossible to stitch together multiple images on the CR system False
T or f? DR requires a plate reader for processing of the image False
Which if the following is an advantage when viewing a digital image compared to conventional film? A. Wider latitude B. Brightness of monitor is less than a view box C. Monitors need to be replaced A
T or F? Digitally captured images suffer from a toe and shoulder similar to the H&D curve of X-ray film False
T or F? Soft copy is the term that refers to the output seen on a display screen True
The beam that contains useful or diagnostic information is known as the: Remnant beam
Digital imaging systems have a large dynamic range, which means that they can respond to a wide range of: Exposures
In analog imaging, the intensifying screen converts X-rays into: Light photons
In an analog to digital converter, the analog input consists of: Electrons
Which symbols compose the binary language ? 0,1
How many shades of gray does an 8-bit image display? 256
As the pixel size decreases, the recorded detail : Increases
Scintillation refers to a material's ability to give off: Light
The acronym PSP stands for photostimulable _______. Phosphor
During processing, image data is released from a PSP receptor after the receptor is struck by _____. A red laser beam
Direct image formation converts X-rays into _______. Electrons
Individual components of a digital imaging are collected in areas of a thin-film transistor known as: DELs
Random information within a diagnostic image that detracts from the overall image appearance is known as: Noise
CCDs are suitable for low dose imaging because they: Respond to low light levels
DQE is a measure of image ______. Quality
Selecting a lower sampling frequency during image processing results in: Larger pixel size and lower spatial resolution
For flat panel detectors, the spatial resolution is determined by the size of the: DELs
The nyquist theorem states that for a given spatial resolution, you must sample the signal at ___ times the desired sampling frequency 2
A digital receptor can produce an image that appears acceptable on a display monitor but that was produced between ____% under exposure and ____% overexposure 50, 100
What is a visual cue that a digital image is underexposed? Increase image noise
______ ______ is determined by the percentage of energy that strikes a receptor material that is absorbed by the receptor Absorption efficiency
Which of the following is not an advantage of digital imaging? A. Greater contrast range B. Long term storage is easier C. Better resolution D. Post processing capabilities C.
In digital imaging, _____ is determined by pixel size. Spatial resolution
Which of the following affects the number of shades of gray for a digital image? A. Matrix size B. Field of view C. Bit depth C.
Created by: taylos84