Screen-Film Mammography

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

Screen-Film Mammography

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

Screen-Film Mammography

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

Screen-Film Mammography Blurring due to motion

Screen-Film Mammography

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

Screen-Film Mammography

Fingerprints

Screen-Film Mammography

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

Screen-Film Mammography Long streak of stain on intensifying screen appearing as minus density

Screen-Film Mammography Obvious underexposure but not caused by technique or processing

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

Screen-Film Mammography Two films loaded into same cassette

Screen-Film Mammography

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

Screen-Film Mammography Wet or damp screen causing plus density

Screen-Film Mammography Easy one. Why is ID superimposed on breast?

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

Screen-Film Mammography Cassette loaded backwards (frontback) into bucky tray.

Screen-Film Mammography Obvious underexposure but not caused by technique or processing

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

Screen-Film Mammography Film loaded upside down into cassette

Screen-Film Mammography Easy?

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

Screen-Film Mammography Cassette loaded upside down into bucky tray.

Screen-Film Mammography

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

Screen-Film Mammography Light leak in cassette Incompletely latched crack

Screen-Film Mammography

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

Screen-Film Mammography Double exposure

Screen-Film Mammography

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

Screen-Film Mammography Compression paddle vertical section (anterior lip)

Screen-Film Mammography

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

Screen-Film Mammography Films run through processor too close together (overlapped)

Screen-Film Mammography

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

Screen-Film Mammography Static electricity

Screen-Film Mammography

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

Screen-Film Mammography Emulsion pick-off caused by pulling stuck films apart

Screen-Film Mammography

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

Screen-Film Mammography Black arrows point at vertical black lines perpendicular to direction of film travel through processor. Cause: pressure from developer roller or moisture on entrance roller.

Screen-Film Mammography

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

Screen-Film Mammography Dust in darkroom and dirty rollers causing emulsion pick-off.

Screen-Film Mammography

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

Screen-Film Mammography Over-development caused by chemical fog.

Radiography Two images of same anatomy. What changed?

http://radiographics.rsnajnls.org/cgi/reprint/11/2/307?maxtoshow=&HITS=10 &hits=10&RESULTFORMAT=&fulltext=grid+artifacts&andorexactfulltext=an d&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

Radiography

No grid 102 cm SID .33R ESE

Grid 122 cm SID 2.2 R ESE

CR What are white spots?

http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=& HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

CR Dust / dirt on phosphor screen

CR

Dirt on CR plate. Right image repeated on screen-film http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=& HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

Rot at ing Mir r or PM Tube

Light Laser Analog/ Digit al

Comput er

Beam scanned across

film

Plate Travel

CR What are white lines?

http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=& HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

CR

Cracks on image plate due to mechanical wear

CR

http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=& HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

CR Transport problems in CR reader Rotating Mirror PMTube Light

Laser

Analog/ Digital

Computer

Beam scanned across film

Plate Travel

CR What are funny dark patterns on ventilator tube metal stabilizer?

http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=& HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

CR Moire effect because of interference between scan frequency of matrix and spiral

CR

http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=& HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

CR Diagonal collimation caused algorithm to improperly recognize collimated area

CR

http://radiographics.rsnajnls.org/cgi/reprint/11/5/795?maxtoshow=& HITS=10&hits=10&RESULTFORMAT=&fulltext=artifact&searchid=1 &FIRSTINDEX=10&sortspec=relevance&resourcetype=HWCIT

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

Ultrasound There’s flow but it isn’t showing up. Why?

http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10& hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

Ultrasound

Improper setting of velocity scale (set too high). Low flow not displayed http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10& hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

Ultrasound What’s that funny reversed flow?

http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10& hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

Ultrasound

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

Ultrasound Low flow in both directions?

http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10& hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

Ultrasound

Doppler angle is 90o; sample volume has vessel perpendicular to beam. Right image alters Doppler angle.

Ultrasound

Same anatomy. Why is there spectral broadening on the left image? http://radiographics.rsnajnls.org/cgi/reprint/12/1/35?maxtoshow=&HITS=10& hits=10&RESULTFORMAT=&fulltext=artifacts&andorexactfulltext=and&search id=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

Ultrasound

71o Doppler angle

81o Doppler angle

Minimize spectral broadening artifact by using Doppler angles < 60o