Computed Tomography is a modernized type of computerized x-ray beam imaging system in which a narrow beam of emitted X-Rays beams is gone for a sample body and immediately turned around the body, creating signals that are prepared by the machine’s PC to produce cross-sectional pictures or “slices” of the body. These slices/cuts are called tomographic pictures/images and contain more data than traditional x-ray beams. When various successive slices are gathered by the machine’s PC, they can be carefully “stacked” together to frame a three-dimensional picture of the sample that takes into consideration simpler distinguishing proof and area of essential structures just as potential defects or variations from the norm.
Film Development
The radiographic film comprises a transparent, blue-tinted base covered on the two sides with an emulsion. The emulsion comprises of gelatin containing minute, radiation delicate silver halide crystal, for example, silver bromide and silver chloride. At the point when x-ray beams, gamma-ray beams or light beams strike the crystal, a portion of the Br -ve ion are liberated and caught by the Ag +ve ion particles. In this condition, the radiograph is said as a hidden image because the changes in the grains are virtually undetectable yet the uncovered grains are currently more sensitive to reaction with the developer.
At the point when the film is processed, it is exposed to a few chemical’s solutions for controlled timeframes.
Processing film basically involves the following five steps.
- Development – The developing agent gives up electrons to change over the silver halide grains to metallic silver. Grains that have been exposed to the radiation grow all the more quickly, yet given enough time the film developer will change over all the silver particles into silver metal. Appropriate temperature control is expected to change exposed grains to silver while keeping unexposed grains as silver halide crystals.
- Stopping the development – The stop bath simply stops the development process by diluting and washing the developer away with water.
- Fixing – Unexposed silver halide crystals are extracted by the fixing bath. The fixer will only dissolve silver halide crystals, leaving the silver metal behind.
- Washing – The film is washed well with sufficient water to remove the entire processing chemicals from its surface.
- Drying – The film is then kept in a special environment and then dried for viewing.