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　　CT dose detection phantomAccurate measurement is achieved by simulating the shape and tissue density of different parts of the human body. For example, the head phantom is approximately 16 cm in diameter to match the size of an adult head, and the body phantom is 32 cm in diameter to match the torso structure. Most of its materials are made of materials with radiation absorption properties similar to human tissue such as polymethylmethacrylate (PMMA) to ensure that the data is clinically representative; some models also inject sodium chloride solution into the internal cavity to further adjust the attenuation coefficient, thereby more realistically reflecting the dose distribution of different tissues. The phantom is embedded with precision instruments such as thermoluminescence dosimeters and photon dosimeters. When receiving a CT scan, these devices record in real time the energy deposition information when the rays pass through. With the help of the standardized structure of the phantom, technicians can determine the median value of the thickness of normal tomography slices and combine the dose data of different slices to draw a three-dimensional distribution map. This layered acquisition approach provides a key basis for optimizing scanning protocols, helping to balance imaging quality and radiation safety.

 

　　CT dose detection phantomPrecautions for use:
 

　　1. Quality control link control
 

　　-Regular traceability verification: sent to the National Institute of Metrology for traceability calibration every year to ensure traceability to the International System of Units (SI) benchmark; internal cross-validation is performed every quarter, and the linearity of each channel is tested using standard source irradiation.
 

　　-Environmental interference troubleshooting: Stay away from strong magnetic field sources (such as MRI rooms), high-frequency electromagnetic equipment and vibrating table surfaces; maintain a constant temperature and humidity laboratory environment (recommended 20±2℃, RH<60) to prevent sensitivity drift caused by expansion and contraction of materials.
 

　　-Electromagnetic compatibility test: Confirm that the shielding effect of the electronic components of the phantom is good. When operating near a 5G base station, the signal integrity should be checked. If necessary, a filtering device should be added to suppress crosstalk noise.
 

　　2. Follow the operating specifications
 

　　-Measures to prevent mechanical damage: use shock-absorbing foam padding during transportation, and it is prohibited to directly drag the cables; hang it vertically during storage to avoid compression deformation that affects the stability of the internal structure.
 

　　-Cleaning and maintenance: Only use a lint-free soft cloth dipped in a small amount of isopropyl alcohol to gently wipe surface stains. Do not soak in disinfectant or high-pressure steam sterilization; the sensor window must be kept transparent and free of obstructions.
 

　　-Personnel qualification management: Only technical personnel who have been trained and certified by the manufacturer can perform high-precision measurement tasks; new employees must complete a dual assessment of theoretical assessment + practical drills before taking up the job.
 

　　3. Safety protection points
 

　　- Wearing personal protective equipment: Wear a lead rubber apron, thyroid neck protector and ring dosimeter during operation. If necessary, add a mobile lead screen to isolate the scattered radiation field.
 

　　-Emergency response plan: Portable radiation alarms are equipped on site to monitor environmental background levels in real time; in the event of accidental overdose exposure, emergency shutdown procedures are immediately initiated and reported to the Radiation Safety Officer.
 

　　4. Special scenario response strategies
 

　　- Multi-modal joint application considerations: In the PET-CT composite rack environment, it is necessary to evaluate the degree of background noise interference caused by the decay of positron nuclide to the solid detector, and adopt pulse synchronous sampling technology to eliminate crosstalk signals.