In order to make the most of spiral CT technology, it is essential to start from the installation phase and ensure that the machine operates in an optimal environment. Proper training for operators is equally important so they understand the machine’s core principles. This not only helps maintain the equipment in good working condition but also ensures efficient usage, maximizing the machine's performance while minimizing operational costs.
In recent years, spiral CT has become widely adopted across hospitals at all levels, significantly enhancing diagnostic accuracy and imaging quality. However, despite its benefits, many hospitals—especially those in lower-tier regions—still face challenges in using these machines efficiently. Issues such as improper operation, lack of user training from manufacturers, and poor maintenance practices have led to increased machine wear, higher failure rates, and greater running expenses. Therefore, it is crucial for users to gain a thorough understanding of their specific spiral CT systems and continuously refine their skills through practical experience to keep the equipment in top condition.
Most spiral CT units in our city were installed after 2000, and based on my experience with their use, I’d like to share some key insights:
1. **Room Selection and Installation Requirements**
The CT room should be located in an area with minimal vibration, low electromagnetic interference, and good air quality. It should also be close to the power source and easily accessible for patients. The layout must allow for safe machine operation, sufficient space for maintenance, and smooth workflow for medical staff. Proper placement of components like regulators, power units, workstations, and high-pressure injectors is critical to reduce interference and improve efficiency.
Cable installation should avoid AC electromagnetic fields, and signal and power lines must be properly shielded. If necessary, cables should be placed in sealed trenches with rod-proof protection. Long cables should be waved rather than folded to prevent damage.
A UPS system is recommended for the computer to protect against data loss. The main power supply should exceed the machine’s total rated power by 10-20%. A reliable grounding system is also vital, with resistance below 2Ω, checked every six months. Grounding connections must also meet strict standards to ensure safety.
2. **Warm-Up Before Scanning**
After each power-on, the machine must be fully preheated before scanning the first patient. This ensures the tube filament is sufficiently heated, preventing damage and maintaining image quality. Failing to do so can lead to unnecessary wear and reduced scan accuracy.
3. **Maintaining Cleanliness**
Daily cleaning of the machine room and internal components is essential. Dust accumulation can cause overheating, increase failure risks, and affect ventilation. Regular dust removal from vents and slip rings helps maintain stable performance and reduces wear between the slip ring and carbon brushes.
4. **Regular Inspection of Consumables**
Components like the slip ring and carbon brush require regular maintenance. After every 5,000 scans or 400,000 rotations, the slip ring should be cleaned, and the carbon brush inspected for wear. Replacement markers are usually engraved on the brush, and it should be replaced when worn down. Lubrication of rotating parts should also be checked regularly to prevent mechanical issues.
5. **Timely Start and End of Scans**
When the machine is ready for spiral scanning, the gantry rotates rapidly, and the filament is fully heated. Operators should initiate scans promptly to avoid unnecessary wear on the slip ring and carbon brush. After scanning, the machine should be exited from the scanning mode to reduce filament load and extend component life. The ratio of slip ring revolutions to tube exposures should ideally be kept under 10:1, depending on the manufacturer’s specifications.
Understanding the machine’s exposure counter and scan modes is also crucial. For example, in axial scans, each image triggers one exposure, while in spiral scans, the counter increases by one second per scan. Proper planning of the scan sequence, including positioning and exposure settings, helps reduce delays, re-scans, and unnecessary radiation exposure.
Ultimately, collaboration between radiologists and technicians is essential. Doctors should take an active role in the scanning process to ensure accurate diagnosis and efficient machine use. This approach not only improves patient care but also extends the lifespan of the equipment and reduces overall costs.
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