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Module 3-Display
Advanced Modalities
| Question | Answer |
|---|---|
| What is another word for electron gun? | Cathode |
| What creates images by beaming electrons towards an anode? | Cathode, electron gun |
| Of the two types of monitors, CRT and LCD, which one provides more luminance and better color reproduction? | CRT |
| Which is more durable of the two types of monitors, CRT or LCD? | CRT |
| Which type of monitor has less screen glare and better resolution and is easier to move and reposition, CRT or LCD? | LCD |
| How is a LCD monitor's resolution determined? | pixel pitch |
| What is pixel pitch? | the distance between the cells of the same color |
| How is the vertical and horizontal resolution determined? | pixel pitch in that given direction |
| The smaller the pixel size, the ________ the spatial resolution. | greater |
| ______ ______ refers to the proportional relationship of the width and height of the display screen. | aspect ratio |
| Most CRT monitors have an aspect ration of ____ whereas LCD monitors have an aspect ration of _____ when viewed in a landscape format. | 4:3, 16:9 |
| Which will produce a better image, 1x1 matrix or 100 x100 matrix? | 100 x 100 |
| The _____ the matrix, the _____ the pixel value in the matrix on the display monitor, and the ______ the resolution. | larger; smaller; greater |
| What is another term for pixel pitch? | dot pitch |
| _____ ______ determines the sharpness of an image. | Pixel pitch |
| The closer the pixels are together, the _____ the image. | sharper |
| In a CRT monitor, what is the pitch? | the distance between phosphor dots |
| In an LCD monitor, what is pitch? | the distance between cells of the same color |
| How many shades of gray does the display monitor need to demonstrate in order to accurately display a radiograph? | 256 shades |
| What is the contrast resolution of a monitor? | the difference btwn the max and the min luminance of the display |
| ____ _____ determines the colors that can be displayed and depends on the graphics adapter and color capabilities of the monitor. | color depth |
| _____ ____ _____ refers to the number of bits used to create the color of a single pixel. | color bit depth |
| When referring to a video display, what does maximal luminance mean? | monitor brightness |
| What is the mininium luminance allowed by the ACR? | 171 candelas per square meter |
| What is another term for minimum level of luminance? | black level |
| Which type of monitor has a lower black level, CRT or LCD? | CRT |
| What term refers to the number of times an image is drawn on the screen each second? | refresh rate |
| What is the refresh rate range? | 60-120 images per sec |
| _____ is the delayed light emission after a CRT screen refreshes. | persistence |
| ______ helps when viewing static images, but it produces ____ ____ in a cine-type display. | persistence ; image lag |
| Technologist workstation monitors are best used in what type of areas? | brightly lit areas |
| Its important to recognize that modifying _______ and ____ _____ alters the exam and permanent patient record. | demographic ; image data |
| What is commonly known as stitching? | opening processed images on the workstations and using software function to join the separate images into a single-image format |
| How many cassettes are processed for a long-leg exam? | 3 |
| How many plates are processed for a scoliosis exam? | 2 |
| Software function allows a black mask to be placed over bright areas, a practice known as ____. | shuttering |
| What are some other terms for shuttering? | black border, black mask, and collimation |
| ______ is the term used when changing the window width and level of an image. | windowing |
| What affect to the image does changing the width and level of an image? | adjusts the brightness and contrast |
| ________ refers to the overall lightness or darkness of an image | brightness |
| _________ refers to the degree of differences in densities of adjacent structures on an image. | contrast |
Created by:
erikasmith28
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