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SUMMER 2018-RADI 103 -WEEK4

Terms in this set (43)

CR and DR systems are almost always connected to PACS using a direct digital interface
TRUE
To avoid data loss a frame grabber must match the video frame rate of the original image.
TRUE
Per the author how many types of film scanners are there?
Three
Which of these film scanner technologies was popular 20 years ago and has been completely replaced newer technology
camera on a stick capture devices
The resulting DICOM image information object of a scanned film or document has what modality type?
SC
In "Modality type SC" SC stands for?
Secondary Capture
What acquisition device is used to capture images and format them into a digital DICOM format by grabbing an analog video frame?
Frame Grabber
If a frame grabber samples a 1024x1024 image at 512x512 how many pixels will be missing from the captured image?
half
OCR stands for?
Optical Character Recognition
The ideal acquisition interface is?
direct digital interface to a digital modality such as CT,MR or US
Errors created during image acquisition do not affect clinical operations
FALSE
Manually entering patient demographic information at the modality as opposed to using a MWL will make more work for the PACS admin in terms of mismatched studies.
TRUE
Film scanners are not needed in an all digital or filmless radiology department.
FALSE
DR does not use the same image processing algorithms as CR
FALSE
All images/studies must have a matching order
TRUE
All orders must have matching images.
FALSE
Radiology orders for fluoro time always generate images as part of the exam
FALSE
What is image acquisition?
the process of digital data acquisition for input into a PACS system
Frame grabbers are limited to how many shades of gray in the images they capture?
256
CCD scanners have a max resolution of how many shades of gray?
1024
Gas laser scanners use what gasses?
helium neon
Current laser scanners can scan as fine as?
50 Microns
After exposure but before the image is transmitted to PACS what do CR units use to improve the image quality?
image processing algorithms
Which image processing algorithm changes the unexposed area from white to black?
image segmentation
Which image processing algorithm performs recognition of the exposure region and collimation edges?
image segmentation
Which image processing algorithm selects the best contrast curve to apply to the image?
contrast enhancement
Which image processing algorithm is easily tuned for Radiologist preference?
Contrast enhancement
Which image processing algorithm is more commonly called edge enhancement?
spatial frequency processing
Which image processing algorithm is useful in the evaluation of diarthrodal joints?
spatial frequency processing
Which image processing algorithm was developed by Fuji?
dynamic range control
Which image processing algorithm was developed by Agfa?
musica
Which image processing algorithm improves contrast in regions of the image that were poorly penetrated during exposure?
dynamic range control
Which image processing algorithm spilts the image into smaller images
aplies contrast enhancement and then recombines the smaller images back into the original image?,musica
Which image processing algorithm results in diminished differences in contrast between features?
musica
DR captures what percent of the X-ray energy ?
80 percent
Before an image or study is stored archived and distributed it is matched up with order information from the ?
radiology information system
What number does PACS use to match study information to order information?
accession number
What happens to studies that have a discrepancy between the DICOM header information and the order information?
they go to a special holding area for the pacs admin to resolve the issue
What is the primary drawback to manually deleting old orders from the system?
its a manual process you have to do daily or weekly.
What are the two methods for generating the MWL at the modality?
automatic event trigger method, manual query/retrieve method
The standard native digital modalities are?
CT MRI and US
What are the two phases of CR/DR digital image processing?
recognition phase, contrast enhancement
What are the two major problems with setting the database to expire orders after a fixed period of time?
vaild scheduled orders get deleted, the time before orders expire has to be set to far out to be effective
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