4 results about "High attenuation" patented technology

The present disclosure provides a flexible ultrasonic transducer and a calibration method, and relates to the technical field of intelligent medical treatment. The ultrasonic transducer comprises a matching layer, an intermediate layer and a backing layer, the matching layer is in contact with breast-related tissue; the backing layer is used for emitting ultrasonic waves to the breast-related tissue and receiving echoes, and the material of the backing layer is a high attenuation material for ultrasonic waves; the intermediate layer comprises an electrode layer and a piezoelectric insulating material, the electrode layer comprises a top electrode in contact with the backing layer and a bottom electrode in contact with the matching layer, the piezoelectric insulating material is surface metallized and arranged between the top electrode and the bottom electrode, and the electrode layer and the piezoelectric insulating material are electrically connected.

The invention relates to a PET / MR attenuation correction method and system, and the method comprises the steps: S1, obtaining a Dixon FLASH sequence, carrying out the noise reduction reconstruction of the Dixon FLASH sequence through a depth reconstruction technology, and obtaining an MRI image through the magnetic resonance reconstruction decoding; s2, based on the MRI image, lung and human body contour segmentation is carried out to obtain lung tissue and air tissue, sCT image synthesis is carried out by adopting a neural network to obtain bone tissue, and soft tissue and adipose tissue are obtained through a Dixon water-fat separation technology; s3, respectively endowing specific attenuation coefficients to the masks of the five tissues, and synthesizing into an attenuation coefficient graph [mu] MAP for attenuation correction; and S4, carrying out attenuation correction on the PET raw data by adopting the attenuation coefficient graph [mu] MAP to obtain a final PET / MR imaging result. Compared with the prior art, the method has the advantages of high attenuation correction precision and high image acquisition efficiency.

A posterior chamber intraocular lens with a function of reducing postoperative vaulting, the lens comprising an optical part and a support part: the optical part is provided with a through hole at the center and the edge of the optical area for maintaining aqueous humor circulation and balancing intraocular pressure; the support part adopts a four-foot haptic structure that is folded inward by 50-60 degrees, and the lower surface of the structure is configured with an array of microvilli that are 0.25 mm long, spaced 0.1 mm apart, and 0.5 mm x 0.5 mm in size; the through hole design ensures the efficiency of aqueous humor circulation, and the foot haptic shape and microvilli anchoring system are optimized in combination, which can effectively embed the ciliary groove tissue and realize a double fixation mechanism; the structure innovation can inhibit the axial displacement of the artificial lens after surgery, prevent excessive postoperative vaulting from falling, solve the problem of vaulting attenuation caused by the change of aqueous humor dynamics and insufficient mechanical fixation of the existing implant, and provide a long-term stable refractive solution for high myopia correction.

A posterior chamber type intraocular lens with a lens and a function of reducing postoperative arch height reduction comprises an optical part and a supporting part, and through holes are formed in the center of the optical part and the edge of an optical area and used for maintaining aqueous humor circulation and balancing intraocular pressure; the supporting part is of a structure with four foot loops folded inwards by 50-60 degrees, array type micro-villus with the length of 0.25 mm, the interval of 0.1 mm and the size of 0.5 mm * 0.5 mm is arranged on the lower surface of the supporting part, the aqueous humor circulation efficiency is guaranteed through the design of through holes, the angle-optimized foot loop form and a micro-villus anchoring system are combined, the supporting part can be effectively embedded into ciliary sulcus tissue, a double-fixing mechanism is achieved, and the supporting part can be used for fixing the ciliary sulcus tissue. The structure innovation can restrain the axial displacement of the intraocular lens after operation, prevents the arch height from being excessively reduced after operation, solves the problem of arch height attenuation caused by aqueous humodynamic change and insufficient mechanical fixation of the existing implant, and provides a long-term stable refraction solution for high myopia correction.