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　　CT dose detection phantomMake measurement results between different institutions comparable. Its unified styling specifications and material properties eliminate errors caused by individual differences and ensure the reliability of quality control data. By covering typical anatomical areas such as the head, chest, and abdomen through a segmented design, the phantom can evaluate the radiation dose of each part in a targeted manner. This is particularly important for developing personalized scanning plans for special groups such as children and obese patients.
 

　　The integrated structure facilitates rapid positioning on the CT examination table, and can improve detection efficiency when combined with automated scanning procedures. At the same time, the anatomical landmarks marked on the surface of the phantom guide the user in accurate positioning and reduce human operating errors. The real-time monitoring function allows instant verification of equipment output compliance with national standards or manufacturer declared values, timely detection of potential faults and intervention. This not only protects patients from excessive radiation hazards, but also helps medical institutions meet radiation protection regulatory requirements.
 

　　In radiation physics research, phantoms can be used as a stable platform to verify the dose efficiency of new imaging algorithms, or to compare the performance boundaries of different devices. For example, experimental designs that simulate patients with different body mass indexes by varying sodium chloride concentrations have been widely used in preclinical studies of low-dose scanning techniques.
 

　　CT dose detection phantomDetermination steps:
 

　　1. Preparation
 

　　-Choose the appropriate phantom type: Select a phantom made of standard water-equivalent materials (such as PMMA or acrylic resin) according to your needs, with sensors such as an ionization chamber, thermoluminescent dosimeter (TLD) or semiconductor detector pre-installed inside. Common specifications include dedicated head/body models and multi-channel designs to cover different anatomical areas.
 

　　Example: The head phantom simulates brain tissue density, and the body phantom matches the proportion of abdominal fat and muscle.
 

　　- Stable state of preheating equipment: Wait at least 30 minutes after turning on the CT machine to allow the X-ray tube current and high-voltage generator to reach thermal equilibrium to avoid initial fluctuations affecting data accuracy.
 

　　-Positioning calibration: Place the phantom in the center of the scanning bed, and use the laser light to align the marking point (usually the geometric center) to ensure position consistency for each measurement. Accurate positioning can be assisted by a three-dimensional coordinate frame.
 

　　2. Parameter setting and scanning protocol execution
 

　　-Basic sequence acquisition: Use commonly used clinical protocols (such as conventional head scan, chest enhancement, etc.) to record key parameters such as tube voltage (kVp), tube current (mAs), pitch factor, and rotation speed. It is recommended to test the response curves at different dose levels in batches.
 

　　Note: Disable automatic exposure control (AEC) and change to manual mode to fix exposure conditions.
 

　　-Special mode verification: For advanced applications such as low-dose screening, special procedures for children, or energy spectrum imaging, corresponding dose profiles need to be established separately. For example, iterative reconstruction algorithms enable before-and-after analysis of noise versus dose relationships.
 

　　3. Data collection and recording
 

　　-Multi-dimensional point distribution measurement: Preset multiple detection points (center axial, radial edge and surface) in the phantom to obtain dose distribution cloud images simultaneously. Focus on monitoring whether the peak skin dose (PSD) exceeds the standard (the international standard limit is ≤2 Gy).
 

　　Tip: Use a smart probe with wireless transmission function to transmit data to the terminal software in real time to reduce human reading errors.
 

　　-Dynamic process tracking: Continuously record instantaneous dose rate changes throughout the scan cycle, paying special attention to the spike phenomenon during the start/stop phase.