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Digital Imaging 3
Module 3
| Question | Answer |
|---|---|
| In a CRT monitor an __________ ________ or ___________ creates images by beaming ___________ towards an _____________. | Electron Gun; Cathode; Electrons; Anode |
| In a CRT Monitor, __________ that are beamed toward the _____________ But are deflected toward the monitor's ______________ __________ to construct the image. | Electrons; Anode; Fluorescent screen. |
| With CRT monitors there are 2 types of image acquisition: _____________ and _____________ | Interlaced; Progressive |
| ____________ CRT monitors fill up each line from top to bottom and ___________ CRT monitors fill every other line from top to bottom and then return to the top to fill in the missing lines. | Progressive; Interlaced |
| _________ Monitor provides more luminance, especially in the ___________ of the image and better ___________ reproduction. | CRT; Center; Color |
| LCD monitors produce less _________ _______ and better ___________. They are also easier to _________ and position. | Screen glare; Resolution; Move |
| _________ monitors are more durable. | CRT |
| An LCD monitor's resolution is determined by __________ __________ which is the distance between __________ of the __________ ________. | Pixel Pitch; Cells of the Same Color |
| The vertical and horizontal resolution in an LCD monitor is determined by the __________ ____________ in that given ___________. | Pixel Pitch in that given direction. |
| Aspect ratio refers to the proportional relationship of the __________ and ___________ of the ___________ __________ | Width; Height; Display Screen |
| Most CRT monitors Aspect ratio is _________ and most LCD monitors are ________ viewed in ___________ format. | 4:3 ; 16:9; Landscape |
| The size of the Matrix also affects ________ resolution. The _________ the matrix, the ____________ the pixel value in the matrix and the _________ the spatial resolution. | Spatial; Larger; Smaller; Better |
| The sharpness of the image is also determined by _________ ________ also known as _________ ___________. | Pixel Pitch; Dot Pitch |
| In a CRT monitor, the "pitch" is the distance between the __________ _________. In an LCD monitor the "pitch" is the distance between what? | Phosphor Dots; LCD=Pixel pitch is the distance between cells of the same color |
| To accurately display the gray scale in a radiograph, the display monitor needs to be able to demonstrate at least ________ shades of gray which is equal to _________. | 256; 8 bits |
| In addition to the minimum gray scale display, the ACR requires what kind of spatial resolution for acquisition monitors? | American College of Radiology requires 2.5 lp/mm when viewing a 14 x 17 image (35.6 x 43.2 cm) |
| The contrast resolution of a monitor is what? | The difference between the maximum and minimum luminance of the display |
| __________ __________ determines the colors that can be displayed and depends on the __________ __________ and color capabilities of the monitor. | Color Depth; Graphics Adapter |
| Color Bit Depth refers to what? | The number of bits used to create the color of a single pixel |
| Monitor brightness when referring to a video display is ___________ ___________. | Maximal Luminance |
| ACR standards specify that gray-scale monitors used for interpreting radiographs provide a minimum of what luminance? | 171 Candelas per square meter (171 cd/m²) |
| The MINIMUM level of luminance is called the __________ _________ and which type of monitor has a measurable lower level. | Black Level; CRT's have a measurable lower Black Level than LCD's |
| The number of times an image is drawn on the screen per second is called the _________ _________. | Refresh Rate |
| Refresh Rates range from _____ to _____ images per second. _________ _________ monitors flicker more visibly. | 60 to 120; Large CRT |
| What is Persistence? | The delayed light emission after a CRT screen refreshes |
| Persistence helps when viewing __________ ____________ but produces __________ ________ when viewing a ________-________ display. | Static Image; Screen Lag; Cine-type |
| Because workstation monitors are used in brightly lighted areas, ___________ __________ is an important consideration when evaluating image quality and the tech must be able to discern __________ and __________, ________ lines. | Monitor Luminance; Motion; Sharp, visible recorded lines |
| Modifying ___________ and image __________ alters the ___________ and _____________ __________ record. | Demographic; Data; Examination; Permanent Patient record |
| All Changes must comply with ___________ __________. | Institutional Guidelines |
| If an order is modified after a work list entry is generated, this change must be described in the __________ _________ with an _____________ note. | Patient Chart; Explanatory |
| The ability to make changes to the demographic and image data depends on the ___________ ____________ of the user. | Privilege Level |
| If an image on the screen is facing left and you need it to face right, you would _________ the image. | Flip |
| Adding additional text to an image is called ____________. | Annotating |
| Joining separate images into a single-image format such as those of anatomical parts longer than 17 inches is called ___________. | Stitching |
| When performing a long leg or scoliosis exam using one exposure and specially designed cassettes, a long leg exam would take ____ plates and a scoliosis exam would take ______. | 3; 2 |
| A workstation software function that allows a black mask to be placed over bright areas is a practice known as ____________. | Shuttering |
| Another term for shuttering is __________ _________, __________ ___________ or ___________. | Black mask, Black border; collimation |
| The ability to adjust the mask size or whether is can be applied manually or automatically depend on ____________. | Manufacturer or vendor |
| Changing the window width and level of an image is referred to as ___________. | Windowing |
| Window level controls the ____________ and window width controls the ____________. | Brightness; Contrast |
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