Intro to Rad Protection week 3
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| show | computed tomography (CT).
ultrasound.
magnetic resonance imaging.
(All of the above.)
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| The latent image is formed on the____ for digital radiography. | show 🗑
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| show | atomic number and mass density
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| show | pixel values
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| Digital imaging could only be developed after advances were made in | show 🗑
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| Computed radiography developed in the 1970s with the use of ____ as the image receptor. | show 🗑
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| Scanned projection radiography was developed as a complement to____. | show 🗑
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| What is the most recent development in digital radiography image receptors? | show 🗑
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| Digital radiography first began to be used in clinical settings in the_____. | show 🗑
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| Spatial resolution is improved with increased____ in digital radiography. | show 🗑
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| show | bit depth
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| show | contrast resolution
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| _____ requires the largest matrix size. | show 🗑
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| show | 1024 X 1024
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| Spatial resolution is determined by the ratio of____to____. | show 🗑
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| show | scattered x-rays.
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| show | number of detectors.
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| The primary limitation of fanned beam radiography is | show 🗑
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| Computed radiography utilizes____ for latent image formation. | show 🗑
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| Conventional x-ray tubes and cassettes are used with____ radiography systems. | show 🗑
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| show | Scanning
array detection
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| show | image density
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| The window width controls | show 🗑
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| Resolution is controlled by ____ size. | show 🗑
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| Detectors currently used in CR include all of the following except | show 🗑
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| Digital radiography replaces | show 🗑
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| show | Flat panel detectors
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| show | indirect conversion
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| show | photodectector
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| During the two part conversion system a _____ converts x-ray photons to light | show 🗑
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| A photostimulable imaging plate includes a ___ layer | show 🗑
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| DR cassettes are also know as | show 🗑
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| The most common phosper use for computed radiography imaging plates is | show 🗑
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| The active layer of the CR imaging plate is made of | show 🗑
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| The latent image is created by energy transfer during | show 🗑
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| show | 8 hours
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| show | image reader device
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| The CR imaging plate is scanned by a(n) | show 🗑
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| When the CR imaging plate is scanned the phosphors of the latent image release energy in the form of | show 🗑
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| During CR imaging plate processing, the laser frees trapped electrons allowing them to return to a lower energy state. This process is known as. | show 🗑
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| show | dynamic
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| show | 5mA
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| show | brightness
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| With image intensification the light level is raised to ____ vision. | show 🗑
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| X-rays that exit the patient and enter the image intensifier first interact with the | show 🗑
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| The output phosphor of the image intensifier is composed of___. | show 🗑
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| The input phosphor converts___ to ___. | show 🗑
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| The ___ in the image intensifier emits electrons when it is stimulated by light photons | show 🗑
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| show | directly proportional
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| Electrons hit the ____ after exiting the anode. | show 🗑
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| The ___ is the product of the minification gain and the flux gain. | show 🗑
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| The ratio of x-rays incident on the input phosphor to light photons exiting the output phosphor is called ___ gain. | show 🗑
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| show | brightness gain
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| An image intensifier tube is identified by the diameter of its | show 🗑
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| Brightness gain is typically in the range of___. | show 🗑
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| Fluoro for an air contrast barium enema is generally done at ___ kV. | show 🗑
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| show | (all of the above)
Contrast resolution, spatial resolution and patient dose
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| Automatic brightness control(ABC) maintains the brightness of the image by varying | show 🗑
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| show | C arm
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| The carriage commonly support the | show 🗑
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| During fluoro, the SOD cannot be less than ___ inches | show 🗑
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| show | light photons, electrons
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| show | electrons
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| show | brightness gain
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| show | concave
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| The shape of the input screen helps to control | show 🗑
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| The photocathode is composed of ___ metals | show 🗑
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| Photoemissive materials absorb ____ and emit ___. | show 🗑
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| The greater the voltage supplied to the electrostatic lenses, the ___ the acceleration and the ___ the focal point to the input screen. | show 🗑
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| show | increase the fluoro tube mA.
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| show | Has higher energy than it should have
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| show | More stimulable light emission
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| show | Metastable states are produced
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| Photostimulable phosphor image receptors | show 🗑
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| show | Expose the image receptor to intense light
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| show | Is under mechanical control
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| Spatial resolution in computed radiography is principally determined by | show 🗑
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| show | The laser
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| How does the computed radiography reader maintain the laser beam as a circle | show 🗑
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| The x-ray capture element of a computed radiography imaging plate is the | show 🗑
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| show | Image contrast
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| show | Fewer repeats
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| show | Requires computer processing
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| show | Is virtually scatter-free
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| The image receptor in CR is | show 🗑
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| Which of the following is used as a radiation detector in a DR | show 🗑
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| show | 30 frames per second
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| show | The x-ray beam is pulsed
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| show | Two
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| show | Is the time needed to switch on the x-ray tube
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| An advantage of digital imaging over conventional imaging is which of the following | show 🗑
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| The mask image is usually the: | show 🗑
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| A misregistration artifact | show 🗑
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| Remasking | show 🗑
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| CR Computerized Radiography | show 🗑
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| show | Digital Radiography where photons are converted to light then to electrons
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| Indirect DR (Digital Radiography) | show 🗑
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| Indirect DR (Digital Radiography) | show 🗑
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| Direct DR | show 🗑
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| Direct DR | show 🗑
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| Minification times flux gain equals | show 🗑
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