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QC

QuestionAnswer
mag mode places the focal point ____, while increasing voltage to the ___. farther from the output phosphor; focusing lenses
mag mode increases size ____ 1.5-4x
magnification formula= normal input diameter/input diameter during magnification
FPD keep the same resolution except if ____ is used. binning
to give the smallest pt dose, we use largest fov
pros and cons of mag mode pros: greater detail and spatial resolution. cons: higher pt dose. dimmer image
intensifier artifact S-distortion is caused by external magnetic field. equipment or earth's magnetic field.
intensifier artifact pincushion distortion is caused by the input is curved
QC testing is done by medical physicists
the reproducibility variance btwn exposures must be less than 5%/0.05
blooming in fluoroscopy when bright areas appear larger. bone, metal. means too much radiation is hitting that area
SMPTE Society of Motion Picture and Television Engineers
DICOM digital imaging and communications in medicine
The actual test pattern used to check compliance TG18 (put out by AAPM- American association of physicists in medicine)
____ writes the standard (GSDF), TG18 is the test pattern used to verify it. DICOM
Who test NEW monitors SMPTE
Who tests regular monitors for compliance DICOM tests with TG18
Which QC test uses lead mesh to look for differences between small black and white objects? testing for High Contrast resolution
Which QC test looks to differentiate between large objects with similar densities? Low contrast resolution
Minimum SID for fixed, mobile and specialized units in fluoro. fixed- 15in or 38cm mobile- 12 special- 8
Which QC test uses a mesh square distortion
Variance in kVp and mAs should be less than 5% kVp 10% mAs (because mAs is bigger)
Maximum amount of image lag should be less than ____% for cardiovascular and less than ____& for GI studies. 10;20
Repeat exposures must be kept below 4-6%
Created by: user-1989152
 

 



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