Help
Options
Question
the degree of geometric sharpness or accuracy of the structural lines actually recorded in the image
click to flip
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't know
Question
recorded detail is also referred to as what
Remaining cards (42)
Know
retry
shuffle
restart
0:00
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
Recorded Detail
Chapter 30 (phys)
| Question | Answer |
|---|---|
| the degree of geometric sharpness or accuracy of the structural lines actually recorded in the image | recorded detail |
| recorded detail is also referred to as what | definition, sharpness, spatial resolution, or detail |
| This term is applied to quantified discussions of recorded detail | spatial resolution |
| The primary unit of resolution is what | line pairs per millimeter or cycles per millimeter |
| Most human visual acuity is limited to what | 5 lp/mm |
| digital imaging recorded detail is determined primarily by what | matrix size, pixel size, and gray scale bit depth |
| How is spatial resolution measured | point spread function (PSF), line spread function (LSF), modulation transfer function (MTF), and system noise |
| The art of radiography involves controlling the degree of ____ so that it does not interfere with image diagnosis | unsharpness |
| This describes that ability of an imaging system to accurately display objects in two dimensions (three dimensions in digital imaging) | spatial resolution |
| Point spread function (PSF), Line spread function (LSF) and Edge spread function (ESF) all express boundaries of an image which in conventional radiography is called | penumbra or blur |
| High spatial resolution represents a high frequency signal that is capable of imaging what size objects | small |
| The higher the spatial frequency the | closer together the line pairs |
| this measures the accuracy of an image compared tot eh original object on a scale of 0 to 1 | modulation transfer function (MTF) |
| An MTF of 0 represents what | no signal/ no image |
| An MTF of 1 represents what | a signal of such extremely high fidelity that is records the image perfectly |
| This is background information that the image receptor receives | imaging noise |
| this refers to a lack of sufficient incoming data for processing. | quantum noise aka quantum mottle |
| This is the processing algorithm that averages the incoming analog data by using the distance between the imaging detector elements | nyquist criterion |
| this occurs when the nyquist criterion is violated (when spatial frequency exceeds nyquist frequency) | allasing |
| Resolution problems should be approached in this order: | 1.eliminate motion 2.reduce OID 3.reduce focal spot size 4.reduce intensifying screen size 5.increase SID |
| This is the imperfect, unsharp shadow surrounding the umbra | penumbra |
| Radiographic film usually has resolving capabilities in the range of | 100 lp/mm |
| The resolving power of an intensifying screen depends in three factors which are | phosphor size, phosphor layer thickness, phosphor concentration |
| phosphor size increases, resolution decreases, density increases, and patient dose | decreases |
| phosphor size decrease, resolution increases, patient dose increases, and density | decreases |
| layer thickness increases, resolution decreases, patient dose decreases, and density | increases |
| layer thickness decreases, patient dose increases, density decreases, and resolution | increases |
| phosphor concentration increases, resolution increases, density increases, dose | decreases |
| phosphor concentration decreases, resolution decreases, dose increases, density | decreases |
| The major factors that limit photostimulable phosphor systems are the | intensifying screen and scanning system |
| The major factor that limits indirect and direct digital systems is the | size of the detector element |
| What effect does increasing SID have on recorded detail? | increases |
| What effect does decreasing SID have on recorded detail | decreases |
| What effect does increasing OID have on recorded detail | decreases |
| What effect does decreasing OID have on recorded detail | increases |
| What effect does increasing patient thickness have on recorded detail | decreases |
| What effect does decreasing patient thickness have on recorded detail | increases |
| What effect does increasing focal spot size have on recorded detail | decreases |
| What effect does decreasing focal spot size have on recorded detail | increases |
| What effect does increasing film/screen speed have on recorded detail | decreases |
| What effect does decreasing film/screen speed have on recorded detail | increases |
| What effect does good film/screen contact have on recorded detail | increases |
| What effect does increasing motion have on recorded detail | decreases |
Created by:
nacquin06