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Radiology Artifacts Radiology Artifacts

Radiology Artifacts

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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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Page 1: Radiology Artifacts

Radiology ArtifactsRadiology Artifacts

Page 2: Radiology Artifacts

Screen-Film Screen-Film MammographyMammography

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 3: Radiology Artifacts

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.

Page 4: Radiology Artifacts

Screen-Film Screen-Film MammographyMammography

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 5: Radiology Artifacts

Screen-Film Screen-Film MammographyMammography

Artifacts caused by dust and dirt on intensifying screen creating white spots simulating calcifications

Page 6: Radiology Artifacts

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Screen-Screen-Film Film

MammograMammographyphy

Page 7: Radiology Artifacts

Blurring due Blurring due to motionto motion

Screen-Screen-Film Film

MammograMammographyphy

Page 8: Radiology Artifacts

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Screen-Screen-Film Film

MammograMammographyphy

Page 9: Radiology Artifacts

FingerprintsFingerprints

Screen-Film Screen-Film MammograMammogra

phyphy

Page 10: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 11: Radiology Artifacts

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

Page 12: Radiology Artifacts

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

Page 13: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Two films Two films loaded into loaded into same cassettesame cassette

Page 14: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 15: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Wet or damp Wet or damp screen causing screen causing plus densityplus density

Page 16: Radiology Artifacts

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?

Page 17: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Cassette Cassette loaded loaded backwards backwards (front-back) (front-back) into bucky into bucky tray.tray.

Page 18: Radiology Artifacts

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

Page 19: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Film loaded Film loaded upside down upside down into cassetteinto cassette

Page 20: Radiology Artifacts

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?

Page 21: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Cassette Cassette loaded upside loaded upside down into down into bucky tray.bucky tray.

Page 22: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 23: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Light leak in Light leak in cassettecassetteIncompletely Incompletely latchedlatchedcrackcrack

Page 24: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 25: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Double Double exposureexposure

Page 26: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 27: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphyCompression Compression paddle vertical paddle vertical section section (anterior lip)(anterior lip)

Page 28: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 29: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Films run Films run through through processor too processor too close together close together (overlapped)(overlapped)

Page 30: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 31: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Static Static electricityelectricity

Page 32: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 33: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Emulsion pick-Emulsion pick-off caused by off caused by pulling stuck pulling stuck films apartfilms apart

Page 34: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 35: Radiology Artifacts

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.

Page 36: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 37: Radiology Artifacts

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.

Page 38: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

http://www.sma.org.sg/smj/http://www.sma.org.sg/smj/4707/4707pe1.pdf4707/4707pe1.pdf

Page 39: Radiology Artifacts

Screen-Film Screen-Film MammograMammogra

phyphy

Over-Over-development development caused by caused by chemical fog.chemical fog.

Page 40: Radiology Artifacts

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?

Page 41: Radiology Artifacts

RadiographRadiographyy

No gridNo grid102 cm SID102 cm SID.33R ESE.33R ESE

GridGrid122 cm SID122 cm SID

2.2 R ESE2.2 R ESE

Page 42: Radiology Artifacts

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?

Page 43: Radiology Artifacts

CRCR

Dust / dirt on Dust / dirt on phosphor phosphor screenscreen

Page 44: Radiology Artifacts

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

Page 45: Radiology Artifacts

Laser

Rotating

Mirror

Beam scanned

across film

PM Tube

Analog/ Digital

Computer

Light

Plate Travel

Page 46: Radiology Artifacts

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?

Page 47: Radiology Artifacts

CRCR

Cracks on image plate due Cracks on image plate due to mechanical wearto mechanical wear

Page 48: Radiology Artifacts

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

Page 49: Radiology Artifacts

CRCR

Transport Transport problems in CR problems in CR readerreader

Laser

RotatingMirror

Beam scannedacross film

PM Tube

Analog/Digital

Computer

Light

Plate Travel

Page 50: Radiology Artifacts

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?

Page 51: Radiology Artifacts

CRCR

Moire effect Moire effect because of because of interference interference between scan between scan frequency of frequency of matrix and matrix and spiralspiral

Page 52: Radiology Artifacts

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

Page 53: Radiology Artifacts

CRCR

Diagonal Diagonal collimation collimation caused caused algorithm to algorithm to improperly improperly recognize recognize collimated areacollimated area

Page 54: Radiology Artifacts

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

Page 55: Radiology Artifacts

CRCR

Chest Chest incorrectly incorrectly specified by specified by technologist technologist to CR reader to CR reader as lumbar as lumbar spinespine

Page 56: Radiology Artifacts

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?

Page 57: Radiology Artifacts

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

Page 58: Radiology Artifacts

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?

Page 59: Radiology Artifacts

UltrasounUltrasoundd

Improper setting of velocity scale (set Improper setting of velocity scale (set too low). Aliasing occurstoo low). Aliasing occurs

Page 60: Radiology Artifacts

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?

Page 61: Radiology Artifacts

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.

Page 62: Radiology Artifacts

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?

Page 63: Radiology Artifacts

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