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221
practice questions
| Question | Answer |
|---|---|
| Contrast resolution is a digital system's ability to | show small differences in gray values |
| The ability of a digital system to display subtle changes in shades of gray is called | contrast resolution |
| T or F: The shape of the histogram is anatomy specific | True |
| The amount of tissue included in an image is called | Field of View (FOV) |
| The useful signal is determined during which part of processing? | Histogram Analysis |
| Which processing parameter will put together multiple images into one single image for display? | Image stitching |
| When the imaging plate is irradiated, stimulated electrons enter the _____ layer. | active |
| T or F: Dynamic range is the ability of a digital imaging system to respond to varying levels of exposure. | true |
| T or F: spatial resolution in digital imaging is dependent on pixel size | true |
| The exposure indicator number is | an indication of radiation absorbed by the imaging plate |
| PSP imaging plates are erased by flooding the plate with | light |
| the arrangement of pixels and rows is called | matrix |
| a graphical representation of a digital image is called | histogram |
| which of the following measures the efficiency of a system to convert xray input signal into a useful output image? | DQE |
| What is the relationship between kvp and subject contrast? | high kvp creates low subject contrast |
| which radiographic image capture method uses chemical development to produce the manifest image? | film/screen radiography |
| T or F: patient demographics are unimportant because the RIS will automatically identify all digital images. | false |
| When xrays strike a photostimulable phosphor material, ______ is released. | light |
| The number of electron/hole pairs is related to the amount of: | light absorbed |
| What does a photoconductor do? | it absorbs xrays and produces electrical charges |
| A look up table maps | image grayscale values |
| T or F: the barcode label is used to identify the PSP | true |
| A charged coupled device (CCD) does all the following except | convert light energy into xray photons |
| The PSP plate is erased: | by flooding it with bright light after every PSP is read manually by selecting the proper eraser method |
| The acronym PACS stands for which of the following terms? | picture archiving and communication system |
| T or F: window width controls the brightness of the image on display | false |
| What device in the reader detects the light being released from the PSP plate during reading? | photodetector |
| T or F: if grid lines are present and run parallel to the scanning laser, the image will not have the moire pattern present | false |
| In what format must images be in so that they can be sent throughout the image viewing system? | DICOM |
| A solid chemical element or compound doped with impurities that make it highly conductive is known as a | semiconductor |
| Which detector converts xray energy directly into electrons? | a-Se with TFT |
| Which of the following are not considered scintillators? | a-Se |
| Which processing technique will amplify particular known frequencies in an image while suppressing others? | edge enhancement high pass filtering masking |
| a system that used scintillators that convert xrays to light, light to electric charge, and store the charge in capacitors is known as a | CMOS |
| in digital projection radiography, what process is used to normalize an image that has been taken with too great of an exposure? | automatic rescaling |
| Which company was the first to introduce PSP imaging commercially in the United States? | Fuji |
| . Which radiographic image capture method uses an X-ray absorber material coupled with a thin film transistor, complementary metal oxide semiconductor, or a charge-coupled device (CCD) to form the digital radiographic image? | FPD |
| The exposure latitude of digital projection radiography responds in a _____________ manner. | linear |
| T or F:Digital systems are less sensitive to scatter radiation than film/screen systems. | false |
| An image formed by recording a continuous changing signal is known as: | analog |
| The measurement of the radiation that was incident on the image receptor for a particular exposure is known as: | KIND |
| The difference between the actual exposure and the target exposure is known as the: | KTGT |
| T or F The best component in a digital system will determine the resolution in a digital image. | false |
| T or F:The Nyquist theorem states that the sampling frequency must be less than twice the frequency of the input signal. | True |
| T or F: Aliasing occurs when the sampling frequency is not greater than twice the frequency of the input signal. | false |
| T or F:The look-up table that is used to determine the brightness and contrast of an image is unique for each anatomic part. | true |
| T or F:Shuttering the digital image will reduce the exposure to the patient. | false |
| 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 in 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 |
| T or F: Too much mAs will cause quantum mottle | false |
| T or F: Overexposure will reduce the contrast resolution of the image. | true |
| 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? | cassette was backward |
| T or F:A thorough cleaning of the light guide by the technologist will remove white lines parallel to the plate travel. | true |
| T or F: Dark line artifacts can be caused by too much kVp in an exposure. | true |
| Too little mAs can cause which artifact? | Quantum mottle |
| Which of the following is used as a photodetector? | a-Si:H |
| Which of the following are not found in an AMFPI? | PSP |
| A Gd2O2S scintillator is known as what type of phosphor? | turbid and unstructured |
| T or F:Gain calibration will remove inherent detector artifacts from an image. | |
| Which of the following can be done to decrease the chance of having image lag occur in the next image? | increase the amount of time between exposures |
| Which type of absorbing material requires a capacitor as the storage element? | a-Se and Photoconductor |
| 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 |
| T or F:Most CMOS detectors use both N-type and P-type transistors to form the electrically controlled gate. | true |
| Which of the two technologies, CCDs or CMOS, is more susceptible to noise, has a lower light sensitivity, uses very little power, and is inexpensive to manufacture? | CMOS |
| A generic term that is used to describe a programmable electronic device that can store, retrieve, and process data is a___________. | computer |
| How many bits are in a single byte? | 8 |
| What keeps the radio frequencies generated within the computer electronics from interfering with outside devices? | the case |
| What is the largest circuitry board inside the computer? | motherboard |
| What device runs the start-up instructions during boot-up of the computer? | BIOS |
| Which is considered the most versatile type of port found on a computer? | USB |
| Which of the following are types of computer mice? | infrared, mechanical, and optical |
| Which type of monitor is most common in hospitals? | OLED |
Created by:
briannagranados