Download - RADIOGRAPHIC FILM PROCESSING DARKROOM. THE PROCESSING AREA PROCESSING AREA VIEWING SECTION
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RADIOGRAPHIC FILM PROCESSING
DARKROOM
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THE PROCESSING AREA
• PROCESSING AREA
• VIEWING SECTION
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VIEWING AREA
PROCESSING AREA
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VIEWING SECTION VIEWBOX ILLUMINATION INTENSITY-500-1000 FOOT CANDLES
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PHOTOMETER IS USED TO MEASURE VIEWBOX
ILLUMINATION INTENSITY
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VIEWING STATION
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VIEWBOX LIGHT
IF ONE BULB IS BLOWN ALL BULBS HAVE TO REPLACED
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VIWBOXES
• TO BE CLEANED ONCE EVERY 6 MONTHS
• IF USED 24/7 – BULBS CHANGES ONCE A YEAR
• IF USED 12/7 BULBS CHANGED ONCE EVERY TWO YEARS
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VIEWING AREA HOT LIGHT
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MOST OF MODERN MEDICAL IMAGING DEPARTMENTS USE AUTOMATIC PROCESSORS—
MOST OF THOSE ARE DAYLIGHT PROCESSORS
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AUTOMATIC DAYLIGHT PROCESSORS
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AUTOMATIC DARKROOM PROCESSORS
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AUTOMATIC DARKROOM PROCESSORS
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MANUAL PROCESSING
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DARKROOM
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BASIC COMPONENTS OF DARKROOM
STORAGE SHELVES
WORKBENCH
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BASIC COMPONENTS:PROCESSOR
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BASIC COMPONENTS:CHEMISTRY MIXING TANKS
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BASIC COMPONENTS:FILM DUPLICATOR
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DUPLICATING FILM EXPOSED TO ULTRAVIOLET RADIATION
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BASIC COMPONENTS:FILM FLASHER
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BASIC COMPONENTS:SILVER RECOVERY SYSTEM
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BASIC COMPONENTSFILM BIN
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FILM BIN AUDIO ALARM
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FILM BIN ANATOMY
CONTAINS INDIVIDUAL SLOTS THAT HOLD FILMS OF DIFFERENT SIZES
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TYPICAL DARKROOM FILM BIN
14 x 17
FRONT
11 x 14
10 x 12
8 x 10
OTHER FILMS
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RADIOGRAPHIC FILM SIZES
• 14 X17 • 11 x 14• 10 x 12• 8 x 10• 7 x 17• 6 x 12• 14 x 36
• 35 x 43• 28 x 35• 25 x 30• 20 x 25• 18 x 43• 15 x 30• 35 x 91
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DARKROOM LIGHT
• WHITE LIGHTS
• SAFELIGHTS
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WHITE LIGHT IS USED FOR:
EQUIPMENT REPAIR AND DARKROOM CLEANING
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SAFELIGHTS USED
DURING FILM PROCESSING
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SAFELIGHT BULBSINCANDESCENT RECESSED WITHIN METALLIC LIGHT
FIXTURE• RED FILTER-- KODAK GBX-2 OR GS-1
• AMBER FILTER --WRATTEN 6B
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SAFELIGHTS
• RED—GREEN LIGHT SENSITIVE FILM ORTHOCHROMATIC
• AMBER –BLUE LIGHT SENSITIVE FILM
• TOTAL DARKNESS FOR PANCHROMATIC FILM
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FILM TRAY
7.5 W
AT LEAST 3 FEET FROM THE FILM TRAY
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FILM TRAY
15 W
AT LEAST 4 FEET FROM THE FILM TRAY
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LATENSIFICATION
INCCREASED SENSITIVITY TO SAFELIGHT ILLUMINATION AFTER FILM WAS EXPOSED
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DARKROOM DESIGN
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LEAD SHIELDING IF ADJACENT TO X-RAY ROOM
• 1/16 INCH OF LEAD IN THE WALLS ALL THE WAY TO THE CEILING.
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IF ADJACENT TO X-RAY ROOMS
• PASS-BOXES NEEDED TO PASS FILMS DIRECTLY FROM THE X-RAY ROOM TO DARKROOM
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VENTILATION
• SYSTEM MUST BE LIGHTPROOF AND ABLE TO FILTER OUT DUST
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HUMIDITY
• 40-60%
• > 60%--FILM FOG
• <40% STATIC ARTIFACTS
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SIZE
• BIG ENOUGH!!!?
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COLOR
• WALLS AND CEILING CAN BE PAINTED IN ANY COLOR
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TEMPERATURE
• 50-70 º F FOR FILM STORAGE– TO SLOW DOWN THE AGING PROCESS OF THE FILM
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WOULD YOU STORE IT LIKE THIS???
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STORE YOUR FILMS STANDING ON THE EDGE TO AVOID
PRESSURE MARKS. USE FILM STORAGE CARTS OR SHELVES
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COLOR OF THE MAZE
DARK-- NOT OT REFLECT WHIT LIGHT INTO THE DARKROOM
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DARKROOM TESTING
• WHITE LIGHT LEAKS
• SAFELIGHT FOG
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SAFELIGHT TEST
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SENSITOMETRY
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SENSITOMETRY-QUANTITATIVE MEASUREMENT OF FILM RESPONSE
TO EXPOSURE & DEVELOPMENT
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FILM DEVELOPMENT
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SENSITOMETRIC STRIPS
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PRODUCING STRIP WITH PENETROMETER
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PRODUCING STRIP WITH PENETROMETER
X-RAY TUBE
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PRODUCING STRIP WITH SENSITOMETER
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PRODUCING STRIP WITH SENSITOMETER
VISIBLE LIGHT
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MEASURING DENSITY WITH DENSITOMETER
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MEASURING DENSITY WITH DENSITOMETER
VISIBLE LIGHT
I o
I t
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OD OPTICAL DENSITY
OD= LOG Io/I t
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0.3 = 2 X DENSITY
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OD vs % OF LIGHT TRANSMISSION
• 0• 1• 2• 3• 4
• 100• 10• 1• 0.1• 0.01
OD % TRANSMISSION
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Characteristic curveCharacteristic curve, a curve used to show the exposure properties of a film or a film screen system. The characteristic curve, which was described in 1890 by Hurter and Driffield, is a representation of how the exposure of the film is related to the measurable signal, i.e. the blackening of the film, or film density. The characteristic curve is different for different film types but has a general shape as shown in Fig.1. The base and fog density is measured on an unexposed film. The shape of the characteristic curve tells the user the contrast properties (slope of the linear part) and the useful exposure range (length of the linear part). It also will indicate the speed of the film (or film-screen system), which can be judged from the curve's position along the horizontal axis. The speed class can also be found from the characteristic curve
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SENSITOMETRIC CURVE
• H & D CURVE
• D Log E CURVE
• CHARACTERISTIC CURVE
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SOLARIZATION
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SYNERGISTIC REACTION
PHENIDONE
HYDROQUINONE
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SOLARIZATION
FILM DUPLICATION
EXPOSURE TIME DENSITY
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Base Plus Fog ( GROSS FOG, D min 0.15 -.20 OD)
The density of the unexposed film base plus any chemical fogging that may occur during
processing
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Inertia Point
TRESHOLD
The point at which the film has absorbed sufficient light energy to start forming a
latent image.
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ToeA non-linear region where shadow detail is recorded in negative materials (Highlight
detail in print material). Compression of the density differences occur and contrast is
decreased.
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Straight Line Portion( GAMMA, SLOPE)
The linear section where most of the information is recorded. This section is used
to determine the processed contrast of the film.
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RANGE OF USEFUL DENSITIES
0.25-2.0
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Shoulder
A non-linear section. Compression of density differences occur and contrast is decreased. It
is unusual to record information on this region of the curve, however this region may
be reached with overexposure or extended development such as push processing to
increase effective film speed
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QUANTITATIVE DATA OBTAINED FROM H&D CURVE
• FILM SPEED
• FILM CONTRAST
• B+F ( BASE PLUS FOG)
• EXPOSURE LATITUDE
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FILM SPEED
SLOWSLOW
FASTFAST
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FILM CONTRAST AVERAGE GRADIENT
A.G.= (OD2 – OD1)/ (LRE2 –LRE1)
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FILM CONTRAST
STEEPNESS OF THE SLOPE
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FILM CONTRAST AVERAGE GRADIENT
D2D2
D1D1
LRE2LRE2LRE1LRE1
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FILM LATITUDE
LATITUDELATITUDELATITUDELATITUDE
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CONTRAST VERY HIGH VISIBILITY OF DETAIL
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VISIBILITY OF DETAIL vs CONTRAST
HIGH CONTRAST
LOW CONTRAST
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PROCESSOR MONITORING
• DEVELOPER TEMP
• DEVELOPMENT TIME
.
• SPEED
• FOG
• CONTRAST
• FOG
• SPEED
• CONTRAST
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THE AUTOMATIC PROCESSOR
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AUTOMATIC PROCESSOR DAYLIGHT SYSTEM
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PROCESSOR
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SECTIONS OF THE PROCESSOR
DF
W
D
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ENTRANCE ROLLERS
ENTRANCEROLLER
ENTRANCEROLLER
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FILMS ORIENTATION ON THE TRAY
14 X 1711 X 1410 X 128 X 107 X 17
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PROCESSOR SYSTEMS & SUBSYSTEMS
• TRANSPORT
• TEMP. CONTROL
• RECIRCULATION
• REPLENISHMENT
• DRYER
• ELECTRICAL
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TRANSPORT
TRANSPORT FILM THROUGH PROCESSOR, REGULATION OF
IMMERSION TIME, AGITATE SOLUTIONS
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TRANSPORT
ROLLER
GUIDE SHOE
RACKS
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TURNAROUND ASSEMBLY
MASTER
GUIDE SHOE
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TURNAROUND ASSEMBLY
MASTER ROLLER
GUIDE SHOE
SQUEEGE ROLLER
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TEMPERATURE CONTROL—DRYER AND SOLUTION
TEMPERATURE
ELECTRICAL HEATER
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TEMPERATURE VARIATION +- 5 DEG. FARENHEIT
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TEMPERATURE
• DEVELOPER
• FIXER
• WASH
• DRYER
• 95 DEG F
• 95 DEG. F
• 90-95 DEG. F
• 135 DEG. F
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TEMP. CONTROL
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DRYER TEMP.
DRYER BLOWER RECIRCULATION
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RECIRCULATION –AGITATION OF SOLUTIONS+ FILTRATION
PUMP
FILTER
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RECIRCULATION
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REPLENISHMENT SYSTEM
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REPLENISHMENT
REPLENISHMENT PUMP
D F
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REPLENISHMENT RATESFOR EVERY 14 IN. OF FILM
• 60-70 ML OF DEVELOPER
• 100-110 ML OF FIXER
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PROCESSING TIME
+- 2 % VARIATION
• 45 SEC-210 SEC.
• MOST PROCESSORS DROP TIME 90 SEC.
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RADIOGRAPHIC ARTIFACTS
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TYPES OF ARTIFACTS
• PROCESSING
• EXPOSURE
• HANDLING AND STORAGE
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PROCESSING ARTIFACTS
• HYPORETENTION• PI-LINES• GUIDE SHOE MARK• STATIC • ENTRANCE ROLLER MARK• CRINKLE MARK• FINGER MARKS• EMULSION PICK-OFF• WATER STAIN
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EXPOSURE ARTIFACTS
• MOTION• IMPROPER POSITIONING• POOR FILM SCREEN CONTACT• DOUBLE EXPOSURE• FOREIGN OBJECTS• BACK-SCATTER• CASSETTE UPSIDE-DOWN• BROKEN CASSETTE• IMPROPER USE OF GRID
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HANDLING & STORAGE ARTIFACTS
• LIGHT FOG
• RADIATION FOG
• STATIC
• SCRATCHES
• HYPORETENTION
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FILMS STUCK TO EACH OTHER DURING PROCESSING
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HYPORETENTION
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PI-LINE
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GUIDE SHOE MARK
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STATIC
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STATIC
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STATIC
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ROLLER MARKS
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FINGER MARKS
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CRIMPING MARK
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PICK-OFF
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WATER STAIN
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WATER STAIN
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POOR FILM SCREN CONTACT
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H.T. (High Voltage) CABLES
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DOUBLE EXPOSURE
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BACKSCATTER OR CASSETTE UPSIDE-DOWN
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BACKSCATTER
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BACKSCATTER OR CASSETTE UPSIDE-DOWN
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MOIRE EFFECT
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WARPED CASSETTE-LIGHT LEAK
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HAIR BUN
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CLOTHES RIBBING
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GRID CUT-OFF
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JEWELLERY
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SCATTER FOG
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SANDBAG
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FOGGING
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KYPHOSIS-CHIN
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STRAP
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Q.A. TESTS
• COLLIMATION
• FOCAL SPOT SIZE
• KVP CALIBRATION
• EXPOSURE LINEARITY
• EXPOSURE REPRODUCIBILITY
• FILM-SCREEN CONTACT
• PROTECTIVE APPAREL INTEGRITY
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COLLIMATION(LIGHT FIELD/RADIATION
FIELD CONGRUENCY)
• SEMI-ANUALLY
• NINE PENNY TEST OR SPECIAL TOOL TEST
• +- 2% OF SID
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FOCAL SPOT SIZE
• ANNUALLY
• PINHOLE CAMERA, SLIT CAMERA, STAR PATTERN
• +- 50%
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STAR PATTERN
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LINE PAIR TEST TOOL
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KVP CALLIBRATION
• ANNUALLY
• KVP METER
• +- 10%
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KVP METER
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EXPOSURE LINEARITY
• ANNUALLY
• DOSIMETER
• +- 10%
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EXPOSURE REPRODUCIBILITY
• ANNUALLY
• RADIATION DOSIMETER
• +-5%
![Page 150: RADIOGRAPHIC FILM PROCESSING DARKROOM. THE PROCESSING AREA PROCESSING AREA VIEWING SECTION](https://reader033.vdocument.in/reader033/viewer/2022061304/5513d4ae55034679748b4e7b/html5/thumbnails/150.jpg)
FILM/SCREEN CONTACT
• ANNUALLY
• WIRE MESH
• NO DARK AREAS PRESENT ON THE FILM
![Page 151: RADIOGRAPHIC FILM PROCESSING DARKROOM. THE PROCESSING AREA PROCESSING AREA VIEWING SECTION](https://reader033.vdocument.in/reader033/viewer/2022061304/5513d4ae55034679748b4e7b/html5/thumbnails/151.jpg)
WIRE MESH
![Page 152: RADIOGRAPHIC FILM PROCESSING DARKROOM. THE PROCESSING AREA PROCESSING AREA VIEWING SECTION](https://reader033.vdocument.in/reader033/viewer/2022061304/5513d4ae55034679748b4e7b/html5/thumbnails/152.jpg)
HOW USE WIRE MESH TO TEST FILM SCRREN CONTACT
CASSETTE
![Page 153: RADIOGRAPHIC FILM PROCESSING DARKROOM. THE PROCESSING AREA PROCESSING AREA VIEWING SECTION](https://reader033.vdocument.in/reader033/viewer/2022061304/5513d4ae55034679748b4e7b/html5/thumbnails/153.jpg)
PROTECTIVE APPAREL
• ANNUALLY
• FLUORO
• NO CRACKS OR HOLES