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Radiology Artifacts. Screen-Film Mammography. http://www.sma.org.sg/smj/4707/4707pe1.pdf. Screen-Film Mammography. Pressure mark or crimp mark due to excessive pressure on film appears as increased optical density. Screen-Film Mammography. http://www.sma.org.sg/smj/4707/4707pe1.pdf. - PowerPoint PPT Presentation
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Radiology ArtifactsRadiology Artifacts
Screen-Film Screen-Film MammographyMammography
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammographyMammography
Pressure Pressure mark or mark or crimp mark crimp mark due to due to excessive excessive pressure on pressure on film appears film appears as increased as increased optical optical density.density.
Screen-Film Screen-Film MammographyMammography
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammographyMammography
Artifacts caused by dust and dirt on intensifying screen creating white spots simulating calcifications
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Screen-Film Film
MammograMammographyphy
Blurring due Blurring due to motionto motion
Screen-Screen-Film Film
MammograMammographyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Screen-Film Film
MammograMammographyphy
FingerprintsFingerprints
Screen-Film Screen-Film MammograMammogra
phyphy
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Long streak of Long streak of stain on stain on intensifying intensifying screen screen appearing as appearing as minus densityminus density
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Obvious Obvious underexposure underexposure but not caused by but not caused by technique or technique or processingprocessing
Screen-Film Screen-Film MammograMammogra
phyphy
Two films Two films loaded into loaded into same cassettesame cassette
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Wet or damp Wet or damp screen causing screen causing plus densityplus density
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Easy one. Easy one. Why is ID Why is ID superimposesuperimposed on breast?d on breast?
Screen-Film Screen-Film MammograMammogra
phyphy
Cassette Cassette loaded loaded backwards backwards (front-back) (front-back) into bucky into bucky tray.tray.
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Obvious Obvious underexposurunderexposure but not e but not caused by caused by technique or technique or processingprocessing
Screen-Film Screen-Film MammograMammogra
phyphy
Film loaded Film loaded upside down upside down into cassetteinto cassette
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Easy?Easy?
Screen-Film Screen-Film MammograMammogra
phyphy
Cassette Cassette loaded upside loaded upside down into down into bucky tray.bucky tray.
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Light leak in Light leak in cassettecassetteIncompletely Incompletely latchedlatchedcrackcrack
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Double Double exposureexposure
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphyCompression Compression paddle vertical paddle vertical section section (anterior lip)(anterior lip)
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Films run Films run through through processor too processor too close together close together (overlapped)(overlapped)
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Static Static electricityelectricity
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Emulsion pick-Emulsion pick-off caused by off caused by pulling stuck pulling stuck films apartfilms apart
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Black arrows Black arrows point at point at vertical black vertical black lines lines perpendicular perpendicular to direction of to direction of film travel film travel through through processor. processor. Cause: Cause: pressure from pressure from developer developer roller or roller or moisture on moisture on entrance entrance roller.roller.
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Dust in Dust in darkroom and darkroom and dirty rollers dirty rollers causing causing emulsion pick-emulsion pick-off.off.
Screen-Film Screen-Film MammograMammogra
phyphy
http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf
Screen-Film Screen-Film MammograMammogra
phyphy
Over-Over-development development caused by caused by chemical fog.chemical fog.
RadiographRadiographyy
http://radiographics.rsnajnls.org/cgi/reprint/11/2/307?http://radiographics.rsnajnls.org/cgi/reprint/11/2/307?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltemaxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=grid+artifacts&andorexactfulltext=and&searchid=1&FIRxt=grid+artifacts&andorexactfulltext=and&searchid=1&FIR
STINDEX=0&sortspec=relevance&resourcetype=HWCITSTINDEX=0&sortspec=relevance&resourcetype=HWCIT
Two images Two images of same of same anatomy. anatomy. What What changed?changed?
RadiographRadiographyy
No gridNo grid102 cm SID102 cm SID.33R ESE.33R ESE
GridGrid122 cm SID122 cm SID
2.2 R ESE2.2 R ESE
CRCR
http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort
spec=relevance&resourcetype=HWCITspec=relevance&resourcetype=HWCIT
What are What are white spots?white spots?
CRCR
Dust / dirt on Dust / dirt on phosphor phosphor screenscreen
CRCR
http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort
spec=relevance&resourcetype=HWCITspec=relevance&resourcetype=HWCIT
Dirt on CR plate. Right Dirt on CR plate. Right image repeated on image repeated on screen-filmscreen-film
Laser
Rotating
Mirror
Beam scanned
across film
PM Tube
Analog/ Digital
Computer
Light
Plate Travel
CRCR
http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort
spec=relevance&resourcetype=HWCITspec=relevance&resourcetype=HWCIT
What are What are white lines?white lines?
CRCR
Cracks on image plate due Cracks on image plate due to mechanical wearto mechanical wear
CRCR
http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort
spec=relevance&resourcetype=HWCITspec=relevance&resourcetype=HWCIT
CRCR
Transport Transport problems in CR problems in CR readerreader
Laser
RotatingMirror
Beam scannedacross film
PM Tube
Analog/Digital
Computer
Light
Plate Travel
CRCR
http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort
spec=relevance&resourcetype=HWCITspec=relevance&resourcetype=HWCIT
What are What are funny dark funny dark patterns on patterns on ventilator ventilator tube metal tube metal stabilizer?stabilizer?
CRCR
Moire effect Moire effect because of because of interference interference between scan between scan frequency of frequency of matrix and matrix and spiralspiral
CRCR
http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort
spec=relevance&resourcetype=HWCITspec=relevance&resourcetype=HWCIT
CRCR
Diagonal Diagonal collimation collimation caused caused algorithm to algorithm to improperly improperly recognize recognize collimated areacollimated area
CRCR
http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort&fulltext=artifact&searchid=1&FIRSTINDEX=10&sort
spec=relevance&resourcetype=HWCITspec=relevance&resourcetype=HWCIT
CRCR
Chest Chest incorrectly incorrectly specified by specified by technologist technologist to CR reader to CR reader as lumbar as lumbar spinespine
UltrasoundUltrasound
http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltexmaxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDEt=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDE
X=0&sortspec=relevance&resourcetype=HWCITX=0&sortspec=relevance&resourcetype=HWCIT
There’s flow but it There’s flow but it isn’t showing up. isn’t showing up.
Why?Why?
UltrasoundUltrasound
http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltexmaxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDEt=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDE
X=0&sortspec=relevance&resourcetype=HWCITX=0&sortspec=relevance&resourcetype=HWCIT
Improper setting of velocity scale (set Improper setting of velocity scale (set too high). Low flow not displayedtoo high). Low flow not displayed
UltrasoundUltrasound
http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltexmaxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDEt=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDE
X=0&sortspec=relevance&resourcetype=HWCITX=0&sortspec=relevance&resourcetype=HWCIT
What’s that funny What’s that funny reversed flow?reversed flow?
UltrasounUltrasoundd
Improper setting of velocity scale (set Improper setting of velocity scale (set too low). Aliasing occurstoo low). Aliasing occurs
UltrasoundUltrasound
http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltexmaxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDEt=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDE
X=0&sortspec=relevance&resourcetype=HWCITX=0&sortspec=relevance&resourcetype=HWCIT
Low flow in both Low flow in both directions?directions?
UltrasounUltrasoundd
Doppler angle is 90Doppler angle is 90oo; ; sample volume has sample volume has vessel perpendicular to vessel perpendicular to beam. Right image beam. Right image alters Doppler angle.alters Doppler angle.
UltrasoundUltrasound
http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltexmaxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDEt=artifacts&andorexactfulltext=and&searchid=1&FIRSTINDE
X=0&sortspec=relevance&resourcetype=HWCITX=0&sortspec=relevance&resourcetype=HWCIT
Same anatomy. Why is there spectral Same anatomy. Why is there spectral broadening on the left image?broadening on the left image?
UltrasounUltrasoundd
7171oo Doppler angle Doppler angle 8181oo Doppler angle Doppler angle
Minimize spectral Minimize spectral broadening artifact by broadening artifact by using Doppler angles < using Doppler angles <
6060oo