Ch. 12-17
Help!
|
|
||||
|---|---|---|---|---|---|
| The two basic components of radiologic film are | base and emulsion
🗑
|
||||
| The main purpose of the gelatin is to | hold the silver halide crystals
🗑
|
||||
| Crystals in film emulsion consist of | silver bromide and silver iodide
🗑
|
||||
| The overcoat on radiographic film is a protective covering of | gelatin
🗑
|
||||
| Latent imaging formation occurs during the film | exposure
🗑
|
||||
| A contaminant in the silver halide crystal created the | sensitivity speck
🗑
|
||||
| The latent image can only be seen after | development
🗑
|
||||
| Photon interaction in the emulsion occur with exposure to both | xray and light
🗑
|
||||
| Film is made with double emulsion to enhance film | speed
🗑
|
||||
| The efficiency of the intensifying screen is improved by the | reflective layer
🗑
|
||||
| A phosphorescent material emits light for a period of time after | stimulation
🗑
|
||||
| An intensifying screen is an example of both | luminescence and fluorescence
🗑
|
||||
| Luminescent material emits light after its outer shell _________ are excited | electrons
🗑
|
||||
| A screen that emits light after an exposure terminates is exhibiting screen _____ | log
🗑
|
||||
| The ability of an intensifying screen to absorb xrays is called | detective quantum efficiency
🗑
|
||||
| The four primary exposure factors are | mA, kVp, time, and SID
🗑
|
||||
| Changes in kVp affect | optical density, image contrast, and image noise
🗑
|
||||
| An increase in mAs causes | no change in beam quality and an increase in beam quantity
🗑
|
||||
| There is a direct relationship between the quantity of xrays and the | milliamperage
🗑
|
||||
| If mAs is increased from 20mAs to 40 mAs the patient dose will increase | double
🗑
|
||||
| A 15% increase in kVp has the same effect on density as _____ the mAs | doubling
🗑
|
||||
| A radiograph with long scale of contrast will also have wide latitude and _____ contrast | low
🗑
|
||||
| Reducing the kVp 15% and doubling the mAs will increase contrast but maintain the | optical density
🗑
|
||||
| At least 30% change in mAs is necessary to produce a visible change in | optical density
🗑
|
||||
| A technique of 55kVp @ 20mAs was used, what technique would double density and produce a longer scale radiograph? | 65kVp @ 20mAs; increase 15%kVp
🗑
|
||||
| Patient dose increases are directly related to increases in ______ | mAs and distance
🗑
|
||||
| The small focal spot is used to provide ______ detail when less quantity if xrays is needed. | greater
🗑
|
||||
| Two effects of added filtration ____ beam quality and ___ patient exposure | increase; reduce
🗑
|
||||
| Lung is the most ____ tissue in the body, fat is more radiolucent than muscle and bone is the most radiopaque | radiolucent
🗑
|
||||
| Emphysema makes the lungs ____ radiolucent | more
🗑
|
||||
| When only optical density needs to be changed only the ___ should be changed | mAs
🗑
|
||||
| Sharpness of detail can be improved by increasing the ___ and ___ | SID; decreasing OID
🗑
|
||||
| ____ is caused by an angled body part when the beam is perpendicular to the image. | foreshortening
🗑
|
||||
| A _____ chart has a set kVp and specific mAs settings either for small, medium, and large or for every 2cm of thickness. | variable mAs technique; fixed kVp technique
🗑
|
||||
| With ____ the exposure is terminated when the optimum optical density is reached | automatic exposure control
🗑
|
||||
| The first generation of computers was run with _____ tubes | vacuum
🗑
|
||||
| Modern day computers use _____ chips to store information | silicon
🗑
|
||||
| Computer ____ includes any part of the computer that you can see and touch | hardware
🗑
|
||||
| The mouse is an example of computer input ___ | hardware
🗑
|
||||
| A tape, diskette, hard disk, or optical density is used to ______ film or archive image | replace
🗑
|
||||
| The bit represents zero or ____ | one
🗑
|
||||
| In computer language, 2 bytes is a _____ | word
🗑
|
||||
| Microprocessors process _____, they do not store data. | data
🗑
|
||||
| Teleradiology is the practice of transferring patient images, and ___ to remote sites | reports
🗑
|
||||
| Digital radiography was first introduced by Fuji in ____ | 1981
🗑
|
||||
| CR IPs and FS cassettes can be used _____ with any xray imaging system | interchangeably
🗑
|
||||
| CR screens respond to radiation with | photostimulable luminescence
🗑
|
||||
| A photostimulable phosphor in a metastable state will emit light ___ when stimulated by xrays, when ___ by light and over time. | immediately; stimulated
🗑
|
||||
| Europium is the ___ of the photostimulable phosphor | activator
🗑
|
||||
| The CR cassette is called an ______ | imaging plate
🗑
|
||||
| The PSP screen is handled in a ____ | reader, scanner
🗑
|
||||
| The CR reader is made up of ______, _____, and ______ modules. | mechanical, optical, computer
🗑
|
||||
| The four steps of creating an image with computer radiography are ____, ____, ____, ____. | exposure, stimulate IP, read IP, erase
🗑
|
||||
| Following the laser stimulation of PSP, the electrons are mostly ____. | relaxed
🗑
|
||||
| Optical filters are used to filter out the ____ light and allow emitted light to reach the photodetector | stimulating
🗑
|
||||
| The output signal from the PSP plate is converted from light to digital by the _____ | computer system
🗑
|
||||
| One of the similarities between CR and SF imaging is that both have ___ | latent images
🗑
|
||||
| The principle source of noise in CR is _____ | scatter radiation
🗑
|
||||
| With computed radiography the contrast is constant ___ | regardless of radiation exposure
🗑
|
||||
| The computed radiography image has ____ exposure latitude and improved ____ resolution | greater/wider; contrast
🗑
|
||||
| After switching from film screen imaging to CR the step of reloading the ___ is eliminated. | cassette
🗑
|
||||
| _____ is prevented by flooding the erased plate (screen) with bright light | ghosting
🗑
|
||||
| Computed radiography images produce ____ gray shades | 10,000
🗑
|
||||
| Switching from screen film imaging to computed radiography can reduce patient ______ | exposure dose
🗑
|
||||
| ______ and contrast resolution are the two principle characteristic of a medical image. | spatial
🗑
|
||||
| In medical imaging, the quality of spatial resolution is measured by the _________ | spatial frequency
🗑
|
||||
| A digital imaging system cannot resolve anything smaller than ___ pixel | one
🗑
|
||||
| A spatial resolution of 4 lp/mm resolves 8 objects per mm, each object being ___ or 0.125mm. | 1/8
🗑
|
||||
| As spatial frequency increases the object size decreases and the _____ increases. | spatial resolution
🗑
|
||||
| In a perfect system the image size would equal the object size and the MTF would be equal to __ | 1
🗑
|
||||
| The human visual system distinguish no more than ___ shades of gray | 30
🗑
|
||||
| The number of shade of gray that an imaging system can produce is called its ___ | dynamic range
🗑
|
||||
| Screen film radiography has a dynamic range of ____ | 1,000
🗑
|
||||
| The bit capacity of each pixel identifies the ___ range of a digital imaging system | dynamic
🗑
|
||||
| The mammography digital imaging systems uses the highest ______ | dynamic range, number of shades of gray
🗑
|
||||
| The portion of the useful image-forming xrays is referred to as the ___ | signal
🗑
|
||||
| Recent studies have shown that denser breast tissue is best imaged with ____ mammography. | digital
🗑
|
||||
| As mAs is increased the _______ is increased | signal to noise
🗑
|
||||
| Image detail is also called ______ | spatial resolution
🗑
|
||||
| With digital imaging, patient dose can be reduced by using ___ kVp techniques | higher
🗑
|
||||
| DQE stands for | detective quantum efficiency
🗑
|
||||
| With digital radiography, problems with overexposure or inadequate brightness or contrast can be corrected during | post processing
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
10153696170312934
Popular Radiology sets