MidTerm, Quiz 3 & 4
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | Output screen
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| show | 90
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| show | 15"
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| show | 0.05 to 5
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| During fluoroscopic image intensification, the primary x-ray beam exits the pt & strikes the ______ of the image intensifier. | show 🗑
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| The photocathode absorbs ________ & emits _________. | show 🗑
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| The output screen absorbs _______ & emits _________. | show 🗑
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| The input screen is ______ in shape. | show 🗑
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| Mobile chest radiography should be performed w/the pt: | show 🗑
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| T/F: Mobile units produce an x-ray beam w/an average photon energy that is quite similar to that of a stationary unit. | show 🗑
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| show | parallel
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| show | there are so many additional variables
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| show | patient
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| show | battery
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| show | C. Analyze density differences
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| show | Scotopic vision
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| How many cones are located in the human eye? | show 🗑
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| The __________ effects occur because the visual system has difficulty perceiving contrast differences that are distance from one another. | show 🗑
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| Visual acuity in daylight & changes in brightness are better due to: | show 🗑
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| What has an impact on the amount of scatter produced from the irradiated material? | show 🗑
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| The purpose of the upper shutter in the collimator is to: | show 🗑
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| show | contrast desired
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| One of the disadvantages of a collimator is it: | show 🗑
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| show | kVp
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| Collimators are restricted in their use for low-level radiation procedures such as: | show 🗑
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| show | veil glare
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| show | Positive beam limitation devices
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| Which of the following was the original type of beam restictor? | show 🗑
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| Digital imaging is a broad term; the term was first used medically in 1970s in: | show 🗑
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| All of the following is true regarding Digital Radiography except: 1. Cassetteless sys 2. Uses a flat panel detector or charge-coupled device (CCD) hard-wire to computer 3. Requires new installation of room or retrofit 4. Requires special cassettes | show 🗑
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| show | Indirect & direct
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| show | DR
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| Most storage phosphor plates are made of: | show 🗑
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| With CR & DR, concerning exposure latitude; kilovoltage peak still influences subject contrast, but radiographic contrast is primarily controlled by an: | show 🗑
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| show | Image processing algorithms
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| show | true
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| show | storage space
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| show | Indirect Capture
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| Which of the following handles data of continuous currents? | show 🗑
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| Concerning the Central Processing Unit of a computer, which of the following is less expensive & needs more transmission time or is slower? | show 🗑
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| show | RAM - Random Access Memory
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| This is a special computer that functions as a peripheral that uses CPU memory to simultaneus math problems in a parallel fashion instead of performing them sequentially & is very useful when vast #s of repetitive calculations are required. | show 🗑
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| There are many types of detectors; which is not on of them? 1. Radiation 2. Nuclear medicine 3. Ultrasound 4. Radiofrequency | show 🗑
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| Concerning digital image acquisition; which of the following determines resolution? | show 🗑
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| Which of the following ensures all equipment speaks the same language even though there are different manufacturers? | show 🗑
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| show | Deconvolution
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| When discussing the display qualities; window level controls the image: | show 🗑
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| When discussing the display qualities; window width controls the image: | show 🗑
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| This type of filtering either amplifies/deletes all but low frequencies, reduces image noise & often used to remove high frequency noise (smoothing). | show 🗑
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| Concerning digital image quality, a measure of total amount of contrast in the image is known as: | show 🗑
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| show | absorbs x-rays.
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| Which one of the following serves to protect against static buildup, dust collection, & mechanical damage to the imaging plate? | show 🗑
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| show | active
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| show | color
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| show | imaging plate
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| show | is never completely lost
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| T/F: Lasers create & amplify wide, soft beams of divergent light. | show 🗑
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| During laser beam formation, both ends of the laser reflect energy back & forth so that the atoms: | show 🗑
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| show | travel in the same direction
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| The optical mirror in the reader: | show 🗑
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| The device that moves the laser rapidly back & forth across the imaging plate is known as: | show 🗑
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| show | 50 cassettes/hour
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| The power source for laser must be: | show 🗑
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| show | raster
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| The process of scanning the moving imaging plate is known as: | show 🗑
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| Which of the followign does not determine CR resolution? | show 🗑
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| show | false
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| Imaing plates should be erased every: | show 🗑
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| CR imaing plates are erased by flooding the plate with: | show 🗑
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| Each square in a matrix is called a: | show 🗑
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| The # of bits per pixel is known as bit: | show 🗑
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| show | spatial
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| show | true
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| show | blue
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| show | soft copy
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| There are 2 systems available for digitizers, one is the CCD Linear array & the other is: | show 🗑
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| show | matrix size
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| show | XY(B/8)
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| What controls the speed at which data can be sent over a network & is measured in bits per second? | show 🗑
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| A __________ connects all computers in a system & often uses ethernet that can have a bandwidth of 10Mbas _________ light. | show 🗑
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| show | PACS - Picture Archiving and Communication System
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| There are 3 light sources for laser printers, which is NOT one of them? 1. infrared 2. helium-neon 3. barium luminescence 4. solid state diode | show 🗑
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| show | red
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| show | print-up
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| Which of the following storge type has a local hard drive, PACS server & RAID Redundant Array of Independent Disks? | show 🗑
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| ________ ________ contains information about the study & the pt. | show 🗑
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| show | Service Object Pairs
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| There are many difficulties w/a PACS system, which is not one of them? 1. small files 2. limited bandwidth 3. special language 4. problems interfacing w/HIS | show 🗑
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| show | true
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| show | Service
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| Failure of the reader to find the collimation edges of an image: | show 🗑
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| show | all values
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| Data collected w/in the collimator are represented by a ___________. | show 🗑
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| A histogram displays the useful signal by locating: | show 🗑
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| The higher the kilovoltage peak, the: | show 🗑
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| show | true
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| show | sampling frequency must be more than twice the imput signal bandwidth
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| If too few pixels are sampled, the result will be: | show 🗑
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| show | occurs because of the # of conversions
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| The longer an image is stored in the CR cassette, the: | show 🗑
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| In an effort to display the pixels for the area of interest when exposure is greater or less than what is needed to produce an image, __________ occurs. | show 🗑
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| Automatic rescaling means that images are produced, regardless of the amount of exposure, with: | show 🗑
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| T/F: Automatic rescaling can be substituted for appropriated technical factors. | show 🗑
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| The amount of error that can be made & still result in tha capture of a quality image refers to: | show 🗑
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| show | false
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| "The sum of the components in a recording system cannot be greater than the system as a whole" is a defintion of: | show 🗑
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| A perfect image processing system would have an MTF of: | show 🗑
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| T/F: It is possible to achieve an MTF of 100%. | show 🗑
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| show | lower
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| show | too low
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| show | loss of information
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| Amplification of the frequencies of the areas of interest is known as: | show 🗑
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| show | masking
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| show | smoothing
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| High-pass filtering is useful for enchancing: | show 🗑
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| Averaging the frequency of each pixel w/surrounding pixel values to remove high-frequency noise is called: | show 🗑
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| Excessive light entering the eye when viewing an image is known as _________ glare. | show 🗑
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| An image manipulation process that fills in the background so that it is darkened is known as: | show 🗑
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| show | false
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| show | stitching
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| show | annotation
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| Magnification of the entire image at the workstation is termed: | show 🗑
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| The ability to send images to local network stations can be accomplished using the: | show 🗑
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| Aliasing results in a ________ effect. | show 🗑
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| If too few pixels are sampled, the result is a lack of: | show 🗑
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| In CR, if exposure is more than _______% below the ideal exposure, quantum mottle results. | show 🗑
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| show | spatial frequency control
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| The more ________ involved in the averaging, the smoother the image appears. | show 🗑
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| If exposure is more than 200% above ideal exposure, _________ __________ results. | show 🗑
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e_ortiz79