MAMMOGRAPHY

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MAMMOGRAPHY

• QUALITY ASSURANCE
• Quality Assurance/Quality Control

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MQSA

• FEDERAL LEGISLATION
• OCT. 1, 1994
• EQUIPMENT DESIGN OPERATION STANDARDS
  (DEDICATED UNITS)
• INTENSIVE QUALITY CONTROL PROGRAM

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QUALITY CONTROL

• Quality control is an equipment and processing
  evaluation program in diagnostic imaging centers.
• QC involves testing, record keeping and
  evaluation of imaging equipment and processing
• QC Team includes Radiographer, Physicists and
  Radiologist
• QA involves people scheduling, reports, waiting
  time and follow up exams

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MAMMO QC

• SEE PG 589 CARLTONS PHYSICS BOOK

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Elements of QC

• TASKS
• Darkroom Clean
• Processor QC sensitometry/densitometry and
  DEVELOPER temp
• Screen Cleaning
• VISUAL CHECK
• Phantom Images
• Repeat Analysis (should be less than 2 repeat
  rate - diagnostic rad 5)

• FREQUENCY
• Daily
• Weekly
• Monthly/Quarterly

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MAMMO QC

• DARKROOM FOG
• SCREEN/FILM CONTACT
• COMPRESSION

• SEMIANNUALLY
• NOT MORE THAN 25 PSI

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Clean crossovers daily
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Dedicated processor
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QUALITY CONTROL TOOLS

• PHANTOM
• DIGITAL THERMOMETER
• SCREEN CLEANER
• LINT FREE CLOTHS
• FIXER RETENTION TESTING KIT
• CHARTS

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DAILY QC
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PHANTOM IMAGES

• Daily - to assure film density, contrast,
  uniformity and image quality are optimum Using
  the SAME cassette and technical factors each
  time.
• 4/5 masses 3/4specks and 4/6 fibers should be
  seen

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REPEAT ANALYSIS

• Mammography should be less than 2
• Number of repeated film
• Repeat Rate --------------------------- X 100
• Total of films
• Diagnostic Radiology less than 5
• Students less than 10

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MORE QC TESTS
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PURPOSE OF QC

• ASSURES OPTIMUM PATIENT CARE by avoiding
  unnecessary repeat exposures due to artifacts,
  processing problems and equipment failure

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EQUIPMENT CONSIDERATIONS

• FILM SCREEN
• VS
• DIGITAL

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EQUIPMENT DIFFERENCES

• TARGET MATERIAL
• MOLYBDENUM
• MO/RHODIUM
• SMALLER FOCAL SPOTS
• SHORTER SID

• KVP RANGES
• 24 30
• MAS
• PHOTOCELLS

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DIGITAL MAMMO

• DIGITAL has a resolution of approximately
• 5 line/pairs per millimeter but also has
  MORE CONTRAST
• CONVENTIONAL FILM/SCREEN resolution of
  approximately
• 12 line/pairs per millimeter

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DIGITAL MAMMOGRAPHY
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DEDICATED MAMMOGRAPIC EQUIPMENT

• KVP RANGE 23 30 kvp
• TARGETS Molybdenum /
  Rhodium (vs. Tungsten)
• FOCAL SPOTS (0.1 0.6)
• SID 60 70 cm (vs. 100cm)
• Compression Paddle
• Heel Effect (fat/cat)
• GRIDS 41 or 51 (vs 8 to161)

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MAMMOGRAPHICIMAGES

• The BREAST has a low subject contrast little
  differences in density soft tissue radiography

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