Chapter 19 screen film image artifacts
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Chapter 19 Screen-Film Image Artifacts. Usually TECHNOLOGIST dependant Patient Preparation Clothes left on (zippers, jewelry, dentures Positioning errors (patient, tube, bucky , receptor) Wrong screen-film combination (detail screens with fast film and vice-versa) “ Bling ” left on.

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Chapter 19 screen film image artifacts
Chapter 19 Screen-FilmImage Artifacts

  • Usually TECHNOLOGIST dependant

  • Patient Preparation

    • Clothes left on (zippers, jewelry, dentures

    • Positioning errors (patient, tube, bucky, receptor)

    • Wrong screen-film combination (detail screens with fast film and vice-versa)

    • “Bling” left on


Processing artifacts
Processing Artifacts

  • Roller marks; guide shoe lines, Pi lines

  • Dirty rollers (curtain effect/run down, etc.)

  • Chemical fog

  • Wet-pressure sensitization (varied amount of pressure on the rollers = uneven film “splotches”)


Handling artifacts
Handling Artifacts

  • Light/radiation fog

  • Kink marks

  • Static (tree, smudge are the most common)

  • Hypo retention (fixer retention – required for mammo)


Chapter 20 film screen quality control
Chapter 20 Film-Screen Quality Control

  • Quality Assurance is a JCAHO required 10 step PEOPLE PROCESS!

  • Quality Control = imaging instrumentation and equipment process


Qc 3 step process
QC = 3 step process

  • Acceptance testing

  • Routine performance monitoring

  • Maintenance


Radiography qc
Radiography QC

  • Filtration – annually

  • Collimation – semiannually (+/- 2% SID)

  • F.S. size – Annually (+/-50%) FREQUENTLY MISSED PARAMETER!

  • kVp calibration – Annually (+/- 10%)

  • Exp. Timer accuracy – annually (based on mS used – more leeway with longer exposures)

  • Linearity – annually (+/- 10%) of same mAs with DIFFERING mA/times

  • Exp. REPRODUCEIBILITY – SAME contrast/density, etc with SAME exp. factors repeated later on


Focal spot size check tools
Focal Spot Size Check Tools

  • Pin hole camera (somewhat hard to use?)

  • Star pattern (down to .3mm sizes)

  • Slit camera – preferred method


Other rad qc
Other RAD QC

  • Filtration

  • Collimation (PBL)

  • kVp/Timer

  • Exposure Linearity (same mAs with VARIED mA and times)

  • Intensifying screens

  • Protective apparel (annually)

  • Film illuminators


Fluoro qc
Fluoro QC

  • Exposure rate (max table top dose/min)

  • Spot film exposures

  • Automatic Exposure System (ABS/ABC – AEC)


Tomo qc
Tomo QC

  • Tube travel/ ARC

  • Fulcrum level

  • Patient exposure


Processor qc
Processor QC

  • See Table 20-6 for QC RAD Processor items/intervals

  • Processor Maintenance

    • Scheduled maintenance

    • Preventative maintenance

    • Nonscheduled maintenance


Processor monitoring
Processor Monitoring

  • Temperatures

  • Replenishment

  • Sensitometry/Densitometry


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