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Precautions for daily storage and use of medical X-ray films

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Update time : 2023-11-29 14:25:00
When many patients go to the outpatient doctor for treatment, they forget to bring the imaging film, the film is lost, or even the film has been soaked. This will cause the outpatient doctor to be unable to quickly and accurately judge the patient's condition; it will also cause the patient to go to the hospital again. A series of complex and cumbersome situations such as reprinting films in the radiology department.
So in daily life, what matters do we need to pay special attention to when using medical film? Today, let me share it with you.
What is x-ray film?
  X-ray film imaging technology is that X-rays are irradiated to the emulsion layer of the film. The silver halide crystals in the emulsion layer react chemically and coalesce with the adjacent silver halide crystals that are also irradiated by X-rays, and are deposited on the film, leaving behind image. The more light the emulsion layer receives, the more crystals coalesce together, and the less light the emulsion layer receives, the less the crystals change and coalesce. No light falls on the emulsion and there is no crystal change or coalescence. This results in different images.
As a film for X-ray photography, it mainly consists of an emulsion layer, a film base, a protective layer and a bottom layer. The protective layer and bottom layer are also called additional layers.
1. Emulsion layer: mainly composed of silver halide and gelatin.
(1) Silver halide: The compound of the halogen elements fluorine, chlorine, bromine, iodine and silver is collectively called silver halide. It is a substance with photosensitive properties and plays the role of recording images. The average silver halide grain size of X-ray film is 1.7um, which is the largest among photosensitive materials. ① The crystal particles are large and the sensitivity is high; ② The crystal particles are evenly distributed, with high contrast and good granularity. ③ The crystal particles are of different sizes and have wide tolerance. ④ The crystal particles are small and the resolution is high.
(2) Gelatin: All kinds of silver halides used in photosensitive materials are insoluble in water, and it is even more difficult to coat directly on the film base. Therefore, a colloidal substance is needed to keep the silver halide crystals in a permanent suspension state without contacting each other and evenly coated on the film base. This substance is gelatin. It has several characteristics: ① Gelatin can improve the sensitivity of emulsions ② Gelatin is a protective colloid ③ Gelatin becomes porous after expansion, allowing smaller molecules to pass through ④ Gelatin has the characteristics of hot melt condensation ⑤ Gelatin is very viscous, making it The emulsion adheres firmly to the base. ⑥Gelatin participates in intermembrane action.
(3) Pigment: Pigment is an organic dye. The absorption spectral range (color sensitivity) of films that do not contain pigments is mostly limited to the blue-violet region below 500 nm, which is called the "intrinsic color sensitivity wavelength range" of silver halide.
2. Film base: X-ray films all use polyester film base. It is characterized by high melting point, good thermal stability, high elasticity, low absorbency, low shrinkage, good flatness and good chemical stability. However, it is not easy to adhere to the emulsion and the static electricity is too large. The polyester base is referred to as PET.
3. Additional layer: including protective layer, bottom layer and anti-halo layer (anti-reflective layer)
Protective layer: To prevent mechanical damage to the soft emulsion layer
Bottom layer (binding layer): To make the emulsion layer firmly adhere to the film base
Anti-halo layer (anti-reflective layer): Prevents strong light from reflecting back from the film base and sensitizing the emulsion layer again, causing fog and blur in the image.
Precautions for storing medical film
The maintenance of the original photosensitive properties of the film has a lot to do with its surrounding conditions. Unsensitized films should be stored as "biological products". to
(1) Standard storage conditions: temperature 10~15℃, humidity 40~60%; prevent exposure to radiation; X-ray films must be completely protected from radiation, which will cause severe fogging of the film. to
(2) Prevent the occurrence of pressure effects: Pressure effects can produce artificial artifacts, which is why film boxes are placed upright.
(3) Avoid contact with harmful gases: The film should avoid contact with harmful gases, such as formalin, engine exhaust, gas, etc. Otherwise, the film will become foggy.
(4) Refrigeration of film: Refrigerated film should be taken out 24 to 36 hours before use and allowed to equilibrate at room temperature. Otherwise, photosensitivity lag will occur. Especially do not open it in the refrigerator.
(5) Expiration date: The outer packaging of the film is marked with an expiration date, which refers to the expiration date under standard storage conditions. If storage conditions deteriorate, quality may deteriorate even within the expiration date. The validity period is generally determined to be 18 months after the factory date.
Precautions for patients when using medical film
Film classification
Due to diseases, many patients will undergo a series of imaging examinations such as DR, CT, magnetic resonance, and gastrointestinal angiography in the radiology department. At this time, we need to classify the imaging films obtained from our examinations. Classifying ordinary X-ray films, CT films, and MRI films not only facilitates cleaning and avoids loss, but also helps doctors access imaging films as needed.
Film sorting by time
The films of each imaging examination will have a clear date; placing them in date order will greatly improve the efficiency of medical treatment next time. In addition to classifying and sorting films, we also need to protect them.
Film sunscreen
The vast majority of imaging films are photosensitive films. When we get the film, we must be careful to avoid exposure to the sun, high temperatures, or long-term exposure to the sun. This can easily cause the film image to discolor and make it difficult to interpret. Therefore, we must avoid exposure to the sun when storing the film. or high temperature.
Film moisture-proof
The film should avoid being wet by rain or moisture. If the film is left in a humid environment for a long time, it will easily cause the image to deliquesce and stick, causing image damage.
Film pressure resistant
To avoid harmful effects of pressure on the film, do not fold or curl it, and keep the film flat when placed. When film is squeezed, folded, and rubbed due to gravity, it is easy to produce artificial artifacts, resulting in blurred film images and thus affecting the doctor's diagnosis. Everyone should pay special attention to this!
Film radiation protection
Prevent any X-rays, gamma rays or any other penetrating rays. In particular, X-ray films should be completely protected from radiation, otherwise it will cause severe fogging of the film.
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