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Ch 17, 31 bushong

physics digital and film artifacts

QuestionAnswer
What is an artifact? An undesirable optical density or blemish on a radiograph or other medical image
What type of artifacts cause the highest repeat rate? exposure srtifacts
what are a few examples of exposure artifacts? jewelry, grid cut off, warped cassette, motion, double exposure, foreign objects
What are the areas that artifacts can occur in film radiography? exposure, processing, handling
What are the 3 types of digital imaging artifacts? image receptor, software, object
This occurs when incomplete erasure of the prior image failed. ghosting
What are some examples of processing artifacts? roller marks, PI lines, guide shoe marks, anything that can occur with the chemicals during processing
The manipulation of dead pixels can be corrected when? preprocessing
What is flatfielding? A software correction that is preformed to equalize the response of each pixel to a uniform x-ray beam
Why do you not store the digital films in the room? They are too sensitive to background radiation
_________ produces the largest file size of all digital images. mammography
What can reduce data files 10 100:1 and can be used for video recordings? lossy compression
This occurs when an image can be exactly reconstructed to be exactly the same as the original? lossless compression
This can reduce data files to 10:1? lossless compression
This requires uncompressed files for imaging? CAD Computer aided diagnosis
The size and number of digital images has to be compressed to allow for ______ and _______. archiving, transmitting! Its weong on the powerpoint!
Object artifacts can arise from 3 things? tech error in pt positioning, x-ray beam collimation, histogram selection
When each anatomical part has a image that is characteristic in shape? histogram
Backscatter radiation ia also troublesome due to the sensitivity of ____________________. the digital image receptor
Flatfielding is pre or post processing? preprocessing
What is the largest size of digital image receptors available? 14 X 17 or 35 X 43 cm ????
When is the histogram selected? before the exam by the tech
What occurs when the film is reused and has already been exposed? double exposure
What has went wrong if there are guide shoe marks on your film? Improper alignment of the turn around wrack
What went wrong if there are Pi lines on the film? either dirty or chemical stains on the rollers
How far apart will the Pi lines be on a film? 3.1416 inches apart (math :)
What happened if the film is blurry? patient movement
What causes static on a film? low humidity in the dark room
A graph of frequency of occurance versus digital value intervals? histogram
What must be done for a histogram to be properly analyzed by the computer? collimation on all 4 sides
Proper collimation and ___________ can prevent histogram errors that can lead to artifacts. centering
Created by: radgirl37
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