Following types of x-ray film are available in medical imaging.
A) Screen film.
B) Direct exposure film.
C) Mammography film.
D) Duplicating film.
E) Substraction film.d
F) Dental film.
G) Medical imaging film.
H) Cine film.
I) spot film.
J) Laser film.
A) Screen film:- Screen film is the types of film that used with intensifying screen. The screen film depends on contrast, speed, spectral matching, anticrossover or antihalation dyes and safe light. The screen film hai various of contrast level. The high contrast level have small grains so it form black and white image. low contrast film have large grains size so it form grey image. The screen film have different speed which is depends up on emulsion.
In crossover matching The silver halide crystals have usually fat and three dimensional. Most emulsion contain tabular grain which are flat silver halide crystal so it covering power and significantly lower crossover.
In spectral matching the rare earth screen are used. The rare earth screen emit UV light, blue, green and red light. The film sensitive to blue and violet not for green and red light. The screen is used in dye. If green emitting screen used the film should be sensitive to blue and green light. This is called spectral matching and film is called green sensitive film or orthochromatic film.
The safe light used in darkroom to required certain precautions for film. In safe light a 15 W bulb at 1.5 M height is proper choice. For blue sensitive film the amber light is safe and for green sensitive the red light safe.
B) Direct exposure film:- The direct exposure film consists of high concentration of silver bromide crystal. The direct exposure film is thick . They are mainly used to image thinner body parts like hands, feet, etc.
C) Mammography film:- The mammography film is a single emulsion and single intensifying screen types film. The mammography film systems used green emitting terbium doped Gadolinium Oxysulfide scree with green sensitive film.
D) Dental film:- It is also called non screen film. The dental film wrapped in moisture and light proof wrappers. The dental film has two size one is intraoral exposure and other is panoramic exposure. The intraoral film size is 1 – 1/4 to 1 – 5/8 inches. It is double emulsion film.
The panoramic films are Single emulsion film size is 5 × 12 inches.
E) Medical imaging film:- The medical imaging film are used in CT, MRI Usg, DR system and PET.
F) Duplicating film:- It is single intensifying screen film and it exposed to UV light.
G) Substraction film:- It is single emulsion film. It is basically used in angiography. It is two types one is designed to proper Substraction of mask image and other is super imposed image of the original radiographer and Substraction mask.
H) Cine film:- The cine film is special examination film which is used in cardiac catheterization laboratory. The film is in Two size 16 mm and 35 mm. It is also used in gastrointestinal tract study in fluoroscopy.
I) Spot film:- The spot film is a single frame camera, the size is 70 mm and 100 mm film.this film is longer then cine film.
J) Laser film:- The laser film used in CT and MRI. It is also used in CR and DR system. The laser beam write the image on the film in faster fashion. This film is sensitive to red light which is emitted by the laser laser printer are light sensitive so it kept dark .