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