imaging Dakota
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| The reflective layer______ | Sends light in a forward direction
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| Thin film transistor is the electronic gate keeper used in flat panel technology? | True
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| The longer an image is stored in the computed radiography (CR) cassette, the: | More energy is lost.
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| A voxel is a representation of the image data | False
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| The wavelength of the CR reader laser is _________ nm | 670-690
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| Flat-panel detectors that use indirect conversion technology convert: | X-rays to visible light
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| The laser scans the imaging plate in a __________pattern | Raster
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| The purpose of the barcode label is to identify the | imaging plate
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| The phosphor layer is made of phosphors from the _______family. | Barium Fluorohalide
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| CR acquires an image through: | the use of a storage phosphor plate
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| A device that acts like a switch to send electrical charges to the image processor in a direct conversion flat-panel detector is known as a ________transistor. | Thin-Film
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| The layer of the imaging plate that traps electrons during exposure is the ____layer | Active
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| Photodiode converts light energy into electrical current. | True
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| What color of light is emitted by a computed radiography photostimulable phosphor plate after stimulation by solid state diode laser light? | Blue
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| The indirect conversion system that requires optical coupling and image size reduction is known as a: | CCD
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| DQE | The ability of a detector element (del) to absorb x-rays or light: its sensitivity to photons.
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| Active Matrix Array | A panel of electronic detector elements laid out in rows and columns: used to convert incoming light or x-ray photons into an electrical signal.
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| CCD | A flat, compact light sensing device that uses a single layer of silicon as its sensitive surface, used for recording images.
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| Conductor | Material that allows the efficient transfer of heat or electricity.
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| Del | Acronym for "detector element" an individual hardware cell in a DR image receptor, capable of producing a single electronic readout from incoming photon (light or X-ray) energy.
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| Fill Factor | The percentage of a detector element's area dedicated in photon absorption.
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| Which of the following measures best determines the performance of a flat-panel detector? | DQE
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| The amount of detail present in any image is known as ________resolution. | Spatial
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| Which of the following is used asa photoconductor? | a-Se
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| The x-ray absorber typically used in direct capture DR is a: | Photoconductor
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| When using a photostimulable phosphor plate to capture the remnant beam, what processes the electrical signal from the photomultiplier and produces a digital image? | Analog to digital converter.
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| The components that focus the signal from the scintillators to the CCD are called: | Fiber optics
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| Each square in a matrix is called | Picture element
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| A turbid scintillation crystal produces: | light spread
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| The purpose of the barcode label is to identify the ______. | Imaging plate
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| Scintillators are phosphors that: | produce light when absorbing x-rays
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| Photoconductors are materials that: | absorb x-rays and produce electrical charges.
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| The type of flat-panel detector that uses thin films of silicon integrated with arrays of photodiodes is known as a(n): | amorphous silicon detector
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| Photo conductor material conducts electricity when illuminated by x-ray photon's. | True
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| Which of the following is not considered a scintillator? | a-Se
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| The imaging plate reader uses a laser to scan the imaging plate, releasing the energy stored in the conductive layer as ______ light. | Blue
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| Fluorescence | Immediate emission of light under stimulation
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| Laser | Light amplification by stimulated emission of radiation
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| Matrix | The collective rows and columns of pixels or dexels that make up the area of an image or Image receptor.
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| Phosphorescence | Delayed emission of light.
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| Similar to CR, DR can use the existing diagnostic equipment found in today's imaging departments. | False
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| The two elements needed to convert light signals into an electrical signal while using indirect capture DR are TFT and: | photodiodes
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| In reference to PSP image capture, to release the latent image, which of the following devices is scanned over the phosphor plate? | Focused laser light
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| CR imaging plates are erased by flooding the plate with __________. | Light
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| The longer an image is stored in the computed radiography (CR) cassette, the: | more energy is lost
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| What is selected in order for the computer processor to control image contrast? | LUT or look up table
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| Grossly overexposed digital images will demonstrate: | loss of contrast
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| In digital imaging, kVp selection has an effect on 1. Photon energy 2. Penetration 3. Image contrast | 1 and 2 only
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| Describe Exposure Latitude | These were fill in the blank which my answer was: this is the margin of error for an image. Which for film it is -30 to +50, while dr and cr it is -50 to +400 percent error.
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| Describe dynamic range | These were fill in the blank which my answer was:
this is what the computer has inputted to make every xray or histogram into a perfect one. This gived you the range of what pixels and how they are arranged.
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| Digital imaging systems cannot compensate for; | too low kVp
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| When a single 15% step increase in kVp is accompanied by a halving of the mAs, the absorbed dose to the patient is: | reduced
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| which of the following groups of technical factors will deliver the greatest patient dose? | 160 mAs, 70 kVp
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| Quantum mottle is not a form of noise | False
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| The only quality not tampered with by digital processing is | Shape distortion
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| Radiography is the best profession ever!!! | True
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| The electronic term used to describe anything that interferes with visualization of the x-ray image is | Noise
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| Exposure factors of 2 mAs and 75 kVp were used for a particular part. Which of the following changes would result in twice the exposure to the image receptor | 4 mAs
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| In the digital age, the main role of radiographic technique is to; | ensure that adequate signal reaches the detector
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| By reducing the mAs by 1/2 and increasing kVp 15% there is a reduction in ESE and absorbed dose by | 1/3rd
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| How are mAs and patient dose related? | mAs and patient dose are directly proportional
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| Increasing mAs will compensate for the lack of kVp. | False
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| In the digital age, anatomy smaller than _____ cm should no longer be imaged using a grid. | 13 cm
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| An increase in kilovoltage will | increase photon energy
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| Which of the following factors influence's the production of scatter radiation? 1. Kilovoltage level 2. Tissue density 3. Size of field |
1,2 and 3
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| Describe subject contrast | These were fill in the blank which my answer was: this is the density of the different tissues in the body and also the amount of absorption of the different tissues in the body from the remant beam
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| For all digital imaging systems, a lower limit for exposure to the receptor is imposed by: | the appearance of mottle
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| How much over-exposure is required before a digital imaging system becomes overwhelmed with data, causing saturation to occur. | 8-10 times
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| Misunderstanding about radiographic technique an the nature of digital imaging, combined with the extremely broad exposure latitude of digital imaging systems, has lead to what problem.? | Dose creep
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| Virtual grid software has been clinically demonstrated to; | all of these
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| In digital imaging, mAs selection has an effect on 1. receptor exposure 2. patient dose 3. brightness | 1 and 2 only
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| An appropriate exposure range that will produce a quality image while delivering acceptable patient dose defines. | exposure latitude
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| S/N is the ratio of signal and noise | True
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| Describe what an Exposure Indicator is. | These were fill in the blank which my answer was: This is a number that will show on how much of the beam was receieved from the exposure. There is a range allowing to see if it was over exposed or underexposed with this number for the exposure.
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| Describe appropriate selection of exposure factors for a digital system | This was fill in the blank, which will be based on your clinic site.
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