In order to use the spiral CT reasonably, it is necessary to start from the installation of the machine to the normal use, and take some necessary rationalization measures, both to let the machine work in a good environment, but also to let the operator understand some principles of the machine. In order to use the machine correctly in the future work, the machine can be used to the maximum effect, while at the same time minimizing the running cost of the machine.
In recent years, spiral CT has been rapidly put into use in hospitals at all levels, effectively improving the diagnostic level and quality of hospital imaging, and laying a good foundation for clinical medical work. However, due to the rapid spread of spiral CT, many hospitals that have spiral CT machines, especially district and county hospitals, are using machines reasonably to maximize the efficiency of the machine and reduce the loss of the machine to the lowest level. There are still many problems. In addition, CT dealers and production plants are not in place to train the hospital's users, resulting in many unreasonable use of the machine, causing unnecessary consumption of the machine, increasing the machine's failure rate and operating costs. Therefore, CT users are required to do some necessary understanding of the working principle and characteristics of their own spiral CT machines. At the same time, they must constantly explore some experiences in actual work, so that their machines can be kept in a good working state to the utmost.
Most of the spiral CTs currently in our city are put into use after 2000. According to the situation of use, I have summarized several experiences for your reference.
1 Room selection and installation requirements
The CT equipment room should be built in an environment with small surrounding vibration, no serious electromagnetic interference, low noise, and high air purity. If possible, it should be considered closer to the power distribution room and convenient for patient access and machine installation. The location of the installation should take into account the safety of the machine, the space left for maintenance, the smooth access of the patient, the convenient operation of the doctor and the good ventilation and ventilation. To minimize interference between various work areas, such as regulators, power distribution, workstations, cameras, processors, high-pressure injectors and other equipment locations.
Cable laying should avoid AC electromagnetic fields (transformers, inductors, motors, etc.), signal lines and power lines should be shielded and shunted. If necessary, it is necessary to make a dark trench with a white iron lining, which is covered and protected against rodents. If the cable is too long, it must be waved and cannot be folded or looped.
The system computer is best equipped with a UPS to ensure that the computer system is working properly. Prevent sudden data loss and data loss and program damage. The CT system power supply trunk capacity should be greater than 10%-20% of the unit's rated total power. The CT machine must have a good grounding device, its resistance is less than 2Ω, and it needs to be checked every six months. The resistance from the ground terminal to all metal parts protected by ground must also be less than 0.1Ω.
2 Warm up after booting
Before the machine is ready to scan the first patient after each power-on, the machine must be fully preheated. The reason is that the filament of the tube is heated sufficiently to prevent the tube from entering the scanning state when the filament is insufficiently heated. It is extremely easy to damage the tube, and because the circuit is not preheated, it will also affect the quality of the image.
3 Keep the environment and the inside of the machine clean
After the machine is running, clean the environment of the machine room every day, keep the environment clean and regularly clean the dust inside the machine, so that the dust can be polluted as little as possible in the machine and the heat dissipation vents, reduce the failure rate of the circuit, and reduce the dust to the slip ring. The pollution and the friction rate between the slip ring and the carbon brush keep the system well ventilated.
4 Consumable parts are regularly inspected
According to the working condition of the machine and the number of patients inspected, the cleaning slip ring and carbon brush are regularly maintained. Under the premise of the third article, we scan the 5,000 patients and the slip ring rotates to 400,000 laps to clean the slip ring. And the carbon brush, and timely check the degree of wear of the carbon brush, the carbon brush is engraved with a replacement mark, and must be replaced when it is worn or close to the replacement mark, to prevent the copper lead in the carbon brush from contacting the slip ring and damaging the slip ring. Regularly check the parts that are frequently rotated, and pay attention to whether the lubrication is in good condition.
5 Start scanning in time to finish scanning in time
Normally, when the machine can perform spiral exposure scanning, the rack scanning system has entered a state of constant rotation, and its speed is very fast. At this time, the bulb filament enters a full-load heating state, and there are prompts on the operation interface and the keyboard. When the operator wants to order the machine to start the exposure scan in time, if the exposure is not started in time, the slip ring and the carbon brush will be used for unnecessary wear and the bulb filament is also used for unnecessary full-load heating. After the scanning is finished, it is necessary to exit the scanning state in time. After exiting the scanning state, the working state of the tube filament is retracted from the full load state to the preheating state, and the slip ring also stops rotating, so that the bulb, the slip ring and the extension tube can be extended. The life of the carbon brush. That is to say, to reduce the ratio of the number of rotations of the slip ring to the number of exposures of the tube, it is generally controlled within 10:1, the smaller the better. This ratio depends on the specific machine, and different manufacturers have different ways of calculating the number of exposures. The following table is the minimum ratio of the number of revolutions of the slip ring to the number of exposures of the tube in several different exposure modes of the HIS-PEED DXI single-row spiral CT of GE, USA, and the repeated adrenal scan is difficult to repeat due to patient cooperation. The result of the scan. When the spiral scanning is performed, the counting mode of the exposure counter of the machine is measured by 1s. The counting table of the axial scanning is measured once for each image, and each TOP positioning image is exposed once.
According to the above principle, when the operator gets the scan application form, he should carefully understand the patient's condition, and make a scan plan according to the condition and reasonably accurately. The scan position should be designed in the key scan position, and the exposure scan should be made in a planned scan sequence. End, reducing unnecessary pauses, replenishment, and waiting during the scan. Especially for the positioning of organs affected by breathing, it is better to design the scanning range slightly larger to avoid unnecessary supplementary scanning, because the waiting loss of the machine is large during the supplementary scanning. This requires the diagnosing doctor to be responsible for both the diagnosis and the scanning technology, to understand the working principle of some machines, to break the old work mode that the technician is only responsible for scanning, and the doctor is only responsible for the diagnosis. It is best for the doctor to scan the patient personally. To prevent the omission of the patient's lesions, it is necessary to avoid unreasonable scanning exposure, minimize the patient's X-ray dose and economic burden, and at the same time reduce the loss of the machine.
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