Medical Xray Fim Flashcards
Discovered chemical development
Louis Daguerre
Discovered permanent photography
Joseph Nicephore Niepce
Discovered wet collodion process
Frederick Scott Archer
Invented gelatin silver bromide dry plate
Richard L. Maddox ( 1871 - England)
Invented a plate coating machine
George Eastman - 1879 (USA)
Discovered xray
Wilhelm Conrad Roentgen (1895 - Germany)
First paper designed for xray
Kodak ( 1896)
He made a plate w/ thicker silver bromide emulsion
Dr. Carl Schleussner, 1896 - Germany
Introduced a double coated film used w/ intensifying screen
Dr. Max Levy, 1897 - Germany
Construction of a medical xray film :
Base
Adhesive
Emulsion
Supercoat
High tensile strength
Polyester
Thickest part
Base
Thin coat of gelatin
Adhesive (Substralum)
Heart of xray film
Emulsion
Protective part
Supercoat
Range of frequency which an electromagnetic radiation propagate
Electromagnetic Spectrum
Range of wavelength which an unaided human eye can perceive wavelength changes
Visible spectrum
Apparent displacement of an image
Parallex error
Use to record the image and made up of suspension of light sensitive salts
Emulsion
Principal material used for film emulsion
Silver Halide Crystal
2 silver halided crystals used for xray type film
Silver iodide
Silver Bromide
Range of wavelength of electromagnetic radiation that the film will respond
Spectral Sensitivity
Wavelength which the film will exhibit its highest response
Peak sensitivity
Wavelength beyond which the film os no longer sensitive
Cut off sensitivity
Has natural sensitivity that ends at the blue region
AgBr (Silver Bromide)
Emits blue light
Calcium Tungstate IS
Emits green light
Rare Earth Screen / Oxysulfide
To create films w/ increased sensitivity ( green light) that was introduced by Vogel
Spectral Sensitizing
Process of extending the sensitivity of silver bromide crystal
Spectral Sensitizing
Types of film according to sensitivity
Monochromatic
Orthochromatic
Panchromatic
Blue sensitive film
Monochromatic
Green sensitive film
Orthochromatic
Sensitive to all colors
Panchromatic
2 types of grains
Globular grains
Tabular grains
Spherical in shape, bigger volume. Use for blue sensitive film
Globular
Provides bigger surface but smaller volume , less silver, green sensitive
Tabular Grain
Measures how sensitive / effective the xray film is
Speed
The difference of the black and white
Contrast
The apparent clumping of the crystal as seen on the radiograph
Graininess
Average grain is
1 micrometer
Binds the silver halide crystal
Binder
First binder use
Collodion
It means formation of water
Gelata
It comes from collagen fiber and it is the modern use
Gelatin
Very good in absorbing light photons
Dye
Films that have emulsion layer coated in both sides
Duplitized / Double coated film
Used w/ IS
Screen type film
Standard type
Contrast
Fine grain w/ good image
Half speed
Opposite of contrast , low contrast and useful exposure range
Latitude
Thicker emulsion layer
Higher resolution
Requires higher exposure factor
Non screen type film / Direct exposure film
Film that have emulsion layer coated on only one side.
Single - coated film
Image produced by the reflected light that pass through the emulsion layer
Halation