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Image visualization magnetic driven nanorobot drug delivery technology is a technology that uses magnetic field to control the movement and release of the nanorobot in the body. It can realize the precise treatment of tumors and other lesions, and monitor their position and effect through imaging means. This technique has the following advantages: The magnetic field can penetrate human tissue without causing damage to normal cells or being affected by blood flow. Nanorobots can realize different motion modes and functions, such as rolling, swimming, drilling, self-assembly, and so on. Nano-robots can realize the protection, targeting and controllable release of drugs through surface modification or internal encapsulation, and improve the bioavailability and therapeutic effect of drugs. Nanorobots can be combined with imaging agents to achieve visual tracking and quantitative evaluation in vivo, and improve the safety and accuracy of treatment. Cases of this technique in cancer treatment: Tumor imaging and drug-targeted delivery systems based on ferritin nanoparticles use the cage structure of ferritin to encapsulate drugs or imaging agents, and target tumor blood vessels or cells by surface modification. This system has good biocompatibility, high safety and significant tumor targeting. A tumor-targeted delivery system based on self-assembled chain paramagnetic particles uses a rotating magnetic field to drive the particle chain to walk along the blood vessel wall and target tumor cells by surface modification. The system is characterized by high drug load, low toxicity and high penetration. A tumor-targeted delivery system based on biomimetic microrobots that use spiral or cilia-shaped microrobots that mimic microbial swimming in body fluids and target tumor tissues by surface modifications. The system is characterized by high flexibility, high efficiency, and low immune response.