test 3
Help!
|
|
||||
|---|---|---|---|---|---|
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
|
🗑
|
|||||
| What are the two types of information computers use | Analog, digital
🗑
|
||||
| What is image blurring | Quantum mottle, noise, motion
🗑
|
||||
| What other terms can be used to explain window width changes | +/-, as width increases, contrast increases
🗑
|
||||
| When is the IP most sensitive to scatter | Before and after exposure
🗑
|
||||
| What is filtering | Hardens the beam, amp or deleted unwanted frequency
🗑
|
||||
| Detectors can detect information from what sources | Cassette bases, cassette less
🗑
|
||||
| What is a matrix and how does it affect resolution | Series of boxes that gives and image form. Bigger the matrix the better the resolution
🗑
|
||||
| What is a pixel and how does it affect resolution | Box that makes up matrix, determines the # or gray tone
🗑
|
||||
| What are thin film transistors | Collect charged products by selenium or silicon on array or matrix pixel sixe detector.
🗑
|
||||
| Define frequency and explain how it relates to contrast. |
🗑
|
||||
| How is noise measured and explain it’s effect on contrast and density | random background info, signal noise ratio
🗑
|
||||
| What does window level control | density +/-
🗑
|
||||
| What is data clipping | Too much info is send through so the computer chooses what dx info needs to be sent
🗑
|
||||
| What does window width control | Contrast x division
🗑
|
||||
| What controls the resolution of the digital image | Pixel size
🗑
|
||||
| What is masking |
🗑
|
||||
| Describe high-pass filtering and when it is useful. Take out all but high frequency, increase image quality |
🗑
|
||||
| How does direct conversion work |
🗑
|
||||
| What is Fourier Transformation | Convert data into a more useful form
🗑
|
||||
| How is an IP erased | processor
🗑
|
||||
| How do detectors acquire information | Through phosphor collectors
🗑
|
||||
| Name some benefits of the increased latitude of CR. |
🗑
|
||||
| Why are imaging plates more sensitive to radiation than radiographic film |
🗑
|
||||
| Describe how a latent image is produced using CR. |
🗑
|
||||
| How long will a latent image store its energy | 32 hr, looses 23% every 8 hr
🗑
|
||||
| How does the latitude of CR compare to that of film | Latent image has a wide latitude
🗑
|
||||
| Define photostiumulated luminescence (PSL). |
🗑
|
||||
| What color light photons are released when electrons return to a lower energy state | Blue violet
🗑
|
||||
| What is the difference between object class and service class in DICOM |
🗑
|
||||
| Describe the difference between cassette-based and cassette-less Systems |
🗑
|
||||
| Based: psp exposed ad put into reader, less: detector and reader are one |
🗑
|
||||
| The smaller the pixel, the _____ the spatial resolution | better
🗑
|
||||
| What is a histogram and why is it generated | Locates min/max signal w/I anatomical region of interest in the image. Provides proper gray scale.
🗑
|
||||
| What happens if an incorrect histogram / algorithm is selected | Density and contrast are off
🗑
|
||||
| What kVp is recommended with non-grid imaging and why | Increase scatter
🗑
|
||||
| Name the layers of photostimulable imaging plates and their functions | Protective, phosphor, conductor, support, light shield, backing
🗑
|
||||
| What is the language computers operate from | binary
🗑
|
||||
| What is the difference in the data handled by analog computers and the |
🗑
|
||||
| data handled by digital computers | AC: continuously varying, DC: definite quantities
🗑
|
||||
| How does indirect conversion work | Uses PSP
🗑
|
||||
| What is the great danger that exists with CR and radiation protection |
🗑
|
||||
| practices | Increase in pt dose beacue of improper tech setting
🗑
|
||||
| What factors that produce low contrast are prone to cause CR image plate |
🗑
|
||||
| fogging | Low kVp
🗑
|
||||
| What is image stitching | Taking multiple images and the computer puts them together as one long image
🗑
|
||||
| Describe how grids should be used with CR. Long part with long axis. CR in the middle of IT |
🗑
|
||||
| What is a scintillator and how does it work | changes light to electrical signal
🗑
|
||||
| What is a charged couple device | converts visible light to x-ray
🗑
|
||||
| What is the difference between RIS and HIS | R-radiology, H; hospital
🗑
|
||||
| What are some advantages of using soft-copy display |
🗑
|
||||
| What affects image quality on a CRT monitor |
🗑
|
||||
| Why can higher ambient light be used with an LCD |
🗑
|
||||
| What is edge enhancement | Over print data at edge line
🗑
|
||||
| Specify three advantages of digital image management in comparison to traditional film/screen environments. |
🗑
|
||||
| What formula is used to calculate digital image size | Why is this important
🗑
|
||||
| What is the difference between a LAN and a WAN | How is each used in an imaging department
🗑
|
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:
638323941
Popular Radiology sets