HIFU technology used for cancer treatment(一)

When HIFU piezo ceramics technology is used for tumor treatment, especially for abdominal tumor treatment,it is breathing that will cause a large movement of the abdominal organs. The displacement can even reach a dozen millimeters. Anesthesia can stabilize the patient's breathing, but organ displacement is inevitable. Movement of the organ will cause the target to deviate, which will affect the precise treatment of the HIFU piezo thermoplastic weight treatment system, and even cause the focused beam to converge to the sensitive tissue near the target area, which is causing serious adverse consequences. Therefore, if you can use the respiratory synchronization technology, let it breathing control the HIFU treatment system,which synchronizes the emission of the focused ultrasound with the respiratory motion, and feedback the movement information of the organ to control the scanning motion mechanism to ensure the focus position and the target position. In this way, High intensity focused piezo technology may be better adapt to the principles of surgical conformal treatment and improve the safety of the HIFU treatment system.

A variety of imaging techniques (B-ultrasound and MIR) are currently available for tumor localization and efficacy evaluation of the HIFU treatment system. From the current technological development, MIR provides a powerful means for the evaluation before tumor treatment, but the application of B-ultrasound is more real-time, practical and operability in the treatment process. Therefore, the application of B-ultrasound in the HIFU is quite common. But it also brings an unavoidable problem. The image obtained by B-ultrasound is a facet scan rather than a tomographic image, and the 4Mhz ultrasonic high focus treatment system is a layered treatment of the tumor, which requires the two-dimensional ultrasound image. Performing three-dimensional reconstruction, the medical staff determines the tumor area based on the ultrasound image, which reconstructs the three-dimensional image of the tumor by computer, and automatically calculates and treats the target target for each layer, which enables the doctor to more intuitively perform the lesion. Observing and clearly distinguish the edge of the tumor tissue to truly achieve the conformal treatment of H IF U.

With the continuous development of computer technology, computers have become an indispensable control for 4Mhz ultrasonic hifu piezo treatment systems. Actually treated in the process, the target point should be tracked and monitored in real time through the computer! The target point is compared with the treatment plan, and computer-assisted intervention is performed according to the difference between the two to ensure accurate positioning. At the same time, according to the difference and depth of the treated tissue, Different automatic adjustment of ultrasound power and duration of action to ensure treatment. How to evaluate the therapeutic effect of 4Mhz hifu piezo transducer is a difficult problem that must be solved. For the HIFU treatment system, the images of the lesion tissue before and after ablation should be distinguished, and the therapeutic effect should be evaluated by means of gray histograms to ensure the effectiveness and safety of HIFU. The HIFU treatment system is a non-invasive treatment device with a high positioning requirement. Because the focal spot is small, it is necessary to scan for large-volume tumors, so the accuracy of scanning is very high. In addition, the complexity of the human tissue structure, the tumor site and morphology also affect the accurate treatment. Many experimental results also indicate that HIFU technology is used improperly and may damage normal tissues.