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Chapter 19 Screen-Film Image Artifacts

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

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  1. 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

  2. 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”)

  3. Handling Artifacts • Light/radiation fog • Kink marks • Static (tree, smudge are the most common) • Hypo retention (fixer retention – required for mammo)

  4. Chapter 20 Film-Screen Quality Control • Quality Assurance is a JCAHO required 10 step PEOPLE PROCESS! • Quality Control = imaging instrumentation and equipment process

  5. QC = 3 step process • Acceptance testing • Routine performance monitoring • Maintenance

  6. 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

  7. Focal Spot Size Check Tools • Pin hole camera (somewhat hard to use?) • Star pattern (down to .3mm sizes) • Slit camera – preferred method

  8. Other RAD QC • Filtration • Collimation (PBL) • kVp/Timer • Exposure Linearity (same mAs with VARIED mA and times) • Intensifying screens • Protective apparel (annually) • Film illuminators

  9. Fluoro QC • Exposure rate (max table top dose/min) • Spot film exposures • Automatic Exposure System (ABS/ABC – AEC)

  10. Tomo QC • Tube travel/ ARC • Fulcrum level • Patient exposure

  11. Processor QC • See Table 20-6 for QC RAD Processor items/intervals • Processor Maintenance • Scheduled maintenance • Preventative maintenance • Nonscheduled maintenance

  12. Processor Monitoring • Temperatures • Replenishment • Sensitometry/Densitometry

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