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RADT427 Mid. Study
| Question | Answer |
|---|---|
| Each square in a matrix is called a __________. | picture element |
| The number of bits per pixel is known as bit: | depth |
| The size of the pixel is determined by the | matrix |
| How dark or light a digital images appears on a display monitor is known as: | brightness |
| The ability of a digital system to display subtle changes in shades of gray is called | contrast resolution |
| The efficiency of a system to convert x-ray input signal into a useful output image is known as | detective quantum efficiency |
| The more manipulation of an image prior to sending it to the MIMPS, the greater the | loss of information |
| An image manipulation process that fills the background so that it is darkened is known as | shuttering |
| Typical PSP cassette throughput is _____ cassettes per _____. | 50; hour |
| Photoconductors are materials that | absorb x-rays and produce electrical charges |
| A device that includes a photosensitive array and small pixels, or detector elements, that convert light into electrical charges is known as _____ transistor | thin-film |
| Flat-panel detectors that use indirect conversion technology convert: | x-rays to visible light |
| This is the "switch" on each pixel element or DEL in a TFT array that sends the electrical charges to the image processor. | field effect transistor |
| The oldest indirect conversion technology used in a variety of image capture applications is | CCD |
| A detector in which each pixel has its own amplifier is known as a | CMOS |
| Quantum efficiency is a measure of the: | amount of electrons produced relative to the incident light from the scintillator |
| ________________ is any imaging acquisition process that produces an electronic image that can be viewed and manipulated on a computer. | Digital imaging |
| Proper patient demographic input is the responsibility of the | technologist |
| When insufficient light is produced by the imaging plate phosphors, the image will: | be grainy |
| Using a FOV or cassette size that is much larger than the part being examined will (increase/decrease) spatial resolution: | decrease spatial resolution |
| Grid use for PSP examinations is more critical than in film/screen radiography because PSP | imaging plates record more scatter |
| What can be done to decrease the chance of having image lag occur in the next image? | Increase the amount of time between exposures and reduce the amount of unattenuated beam |
| The oldest indirect conversion technology used in a variety of image capture applications is | CCD |
| What is the function of a capacitor? | It converts x-ray photons to light and stores it |
| Some advantages to CCDs include: | They are less expensive to manufacture compared to TFT systems and the module design makes repairs and upgrades easy. |
| ________ and nuclear medicine were easy converts to the digital world. | Ultrasound |
| The concept of moving images digitally was introduced by Albert Jutras in Canada during his experimentation with ____________. | teleradiology |
| _________ is the digital acquisition modality that uses storage phosphor plates to projection images. | PSP |
| __________ Capture digital radiography devices absorb x-rays and convert them into light. The light is then collected by an area-CCD, CMOS, or TFT array and then converted into an electrical signal that is sent to the computer for processing. | Indirect |
| A _____ is a table that maps the image gray-scale values into some visible output intensity on a monitor or printed film | LUT |
| ______ is a networked group of computers, servers, and archives that can be used to manage digital images. | MIMPS |
| Which radiographic image capture method uses chemical development to produce the manifest image? | Film/screen radiography |
| Which company was the first to introduce PSP imaging commercially in the United States? | Fuji |
| When x-rays strike a photostimulable phosphor material, _________ is released. | light |
| The exposure latitude of digital projection radiography responds in a _______ manner. | nonlinear |
| The acronym for MIMPS stands for: | Medical Image Management and Processing System |
| In what format must images be in so that they can be sent throughout the image viewing system? | DICOM |
| An image formed by recording a continuous changing signal is known as: | Analog |
| The arrangement of pixels in rows and columns is known as | Matrix |
| The amount of tissue included in the image is referred to as: | Field of View |
| The difference between the actual exposure and the target exposure is known as the: | DI- Deviation Index: |
| What measures the efficiency of a system to convert the x-ray input signal into a useful output image? | DQE- Detective Quantum Efficiency |
| A graphical representation of a digital image is called a | histogram |
| The useful signal is determined during which part of image processing? | Image sampling |
| In digital projection radiography, what process is used to normalize an image that has been taken with too great of an exposure? | Automatic rescaling |
| What processing technique will amplify particular known frequencies in an image while suppressing others? | Edge enhancement |
| What processing parameter will put together multiple images into one single image for display? | Image stitching |
| The active layer in a PSP plate is usually made of phosphors from what family group? | Barium fluorohalide |
| Which layer of the PSP plate sends light in a more forward direction when released the reader? | Reflective |
| Which layer of the PSP plate reduces static electricity? | Conductive |
| The laser excites the electrons trapped in the phosphor centers so that the energy may be released in the form of_________________ | Light |
| What device in the reader detects the light being released from the PSP plate during reading? | Photodetector |
| After processing the image, strange artifacts are present that look metallic but are not present on the patient or table. Which of the following could be the cause of these artifacts? | The cassette was backward |
| Too little mAs can cause which artifact? | Quantum mottle |
| The layer in a CCD chip that contains the electron gates is the: | polysilicon layer |
| The insulating layer in a CCD chip is the: | silicon dioxide layer |
| A system that used scintillators that convert x-rays to light and light to electric charge and stores the charge in capacitors is known as a: | CMOS |
| A solid chemical element or compound doped with impurities that make it highly conductive is known as a: | semiconductor |
| Which of the two technologies, CCD or CMOS, is more susceptible to noise, has a lower light sensitivity, uses very little power, and is inexpensive to manufacture? | CMOS |
| If a -3 red color indicator is seen on the left side of a deviation index after an exposure, the technologist can assume this is due to ______________ | underexposure |
| If a green color indicator is seen on a deviation index after an exposure, the technologist can assume this is due to ______________ | optimal exposure |
| If a +3 red color indicator is seen on the right side of a deviation index after an exposure, the technologist can assume this is due to ______________ | overexposure |
| T/F: Image aliasing is similar to moire effect. | True |
Created by:
rdwilliams
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