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120 Cards in this Set
- Front
- Back
Image of Artifact |
Modality Name of cause |
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CR Double Exposure |
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Extraneous materials blocking image |
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Upside down grid, loss of density away from center of grid |
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Grid cut off |
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Moire pattern, two grids |
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Motion |
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Motion with single phase generator |
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Backscatter from film tray |
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Over exposed |
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Underexposed |
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Film Radiography Finger nail marks |
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Film Radiography Pressure artifact crushed by other films in the bin |
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Film Radiography Static: spot or smudge From ionizing gas molecules near film surface |
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Film Radiography Static: tree like From non-light producing static discharges |
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Film Radiography Safelight fog |
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Film Radiography Light fog from a cracked door |
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Film Radiography Light fog |
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Film Radiography Dirt screen |
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Film Radiography Poor Film-Screen Contact |
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Quantum Mottle |
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Overexposure causing saturation and loss of image in the thinner areas of the patient |
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Planking |
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Fading, light image of decreased quality which appears grainy Information loss is non-uniform |
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Light leak |
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CR Dirty light guide |
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Faulty Transfer |
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Faulty transfer |
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Misregistration |
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Border detection |
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Moire |
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Überschwinger |
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Density Threshold |
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US Reverberation |
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US Twinkling |
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CR double exposure |
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CR Paradoxic Overexposure |
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CR Light Leak |
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CR Dirty Light Guide |
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CT Ring artifact Bad Detector |
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CT Beam Hardening |
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CT Stair step |
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CT Out of Field |
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CT Attenuation Artifact |
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MR Chemical Shift |
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MR Magnetic Susceptibility |
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MR Cross Talk |
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MR Wrap around |
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US Speed Propagation |
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US Electrical interference |
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US Slice Thickness Pseudosludge |
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US Reverberation |
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NM Inadequate Counts |
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NM Septal Penetration |
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NM Camera Contamination |
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NM Malfunctioning PMT |
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CT Aliasing from a high frequency object |
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CT Motion |
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CT Windmill artifact Interpolation from multislice CT |
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CT Cone Beam Truncation |
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CT Step Artifact Slice is too thick for reformat |
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CT Zebra Artifact Helical data interpretation |
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CT Volume averaging From slice thickness, produces pseudo-lesions |
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CT Out of field artifact Anatomy is outside the FOV |
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CT Algorithm Rebound |
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CT Ring artifact Faulty detector |
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CT Beam Hardening |
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CT Streak artifact From bone or contrast |
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US Edge Shadowing |
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US Distal Acoustic Enhancement |
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US Refraction Duplication of structure |
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US Reverberation Comet tail; tapered triangle; ring down |
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US Slice thickness pseudo sludge (curved); resembles side lobe artifact |
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US Mirror image Usually GB and diaphragm |
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US Speed propagation artifact |
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US Electrical interference |
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DR Planking Also shows memory artifact |
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DR Calibration mask artifact |
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CR Cassette upside down |
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CR Cassette upside down |
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CR Double Exposure |
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DR Quantum Mottle Increase mAs to fix |
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DR Paradoxic overexposure |
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CR Light Leak |
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CR Delayed reading Grainy image |
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CR dirt on plate |
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CR Dirty light guide |
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DR Moire artifact Grid line/sampling artifact |
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DR Faulty Data transfer |
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CR Auto shutter error |
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DR Incorrect anatomic region selected |
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NM Cracked NaI crystal |
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NM Attenuated intrinsic flood source Metal needle attenuates portion of Tc source |
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NM Malfunctioning PM tube Hot or cold areas on the flood Fix: retune |
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NM Blown PM tube |
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NM Edge packing Reflecting of light at edge of crystal so counted twice by PMT Intense ring at edge |
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NM Septal penetration High energy photon with low energy collimator |
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NM Collimator Septal damage |
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NM Pixel roll over Bit depth is too low |
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NM Digital round off error elephant skin flood |
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NM Off peak flood |
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NM Uncorrected and corrected flood |
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NM Non-linearity Out of tune PMT Pincushion, not straight lines on the phantom |
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NM Air bubble in flood |
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NM Improperly mixed water phantom |
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NM Contamination on patient |
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NM Metallic artifact |
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NM Glandular uptake of free Tc |
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NM Poor anatomic detail Edema, metabolic, increased pt -camera distance |
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NM Bladder hot spot Use shielding |
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NM Injection site hot spot |
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NM Hot source near camera during acquisition |
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NM Moire artifact Sample too low |
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MR Ghosting Motion in the phase encoding direction |
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MRI Aliasing/wrap around Anatomy outside of FOV |
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MR Chemical shift Occurs in frequency direction, use lower field strength, incr bandwidth, swap phase/frequency |
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MR Chemical misregistration |
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MR Truncation Banding in the phase direction |
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MR Crosstalk Need 30% gap between slices and no overlap of slabs |
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MR Zipper artifact RF leak or object in room, type of electrical interference |