2 results about "Tissue inhomogeneity" patented technology

The invention discloses a method, device and equipment for predicting the fatigue life of a connecting piece, a medium and a program product, and belongs to the technical field of mechanical structural parts, and the method comprises the following steps: obtaining a CT scanning image of a connecting piece area, and calculating a performance reduction coefficient in combination with a standard sample fatigue test; key macroscopic mechanical parameters of the base metal and the welding flux are obtained, a macroscopic mismatch factor is calculated, and a microstructure non-uniformity factor is calculated according to microhardness distribution of the connecting piece; equivalent load conversion of the environmental impact factors is calculated; correcting the finite element model based on a performance reduction coefficient, a macroscopic mismatch factor, a microstructure non-uniformity factor and equivalent load conversion; and based on the corrected finite element model, obtaining a fatigue life prediction result of the connecting piece. According to the method, the mechanical influence of the defects of the connecting piece is accurately quantified, and the material influence factor and the environment influence factor are considered, so that multi-source collaborative coupling correction is formed, and the fatigue life prediction precision of the connecting piece is effectively improved.

This invention discloses an adhesive tissue equivalent compensation membrane for breast cancer radiotherapy, relating to the field of radiotherapy compensation membrane technology. It includes: an adhesive layer on one side that directly contacts the skin; a variable tissue equivalent layer; and an outer protective layer for providing mechanical protection while also ensuring compatibility with radiotherapy equipment. The proposed zoned adjustable microchannel / microcavity filling mechanism can locally adjust the relative electron density and water equivalent according to the radiation path, thereby achieving point-to-point spatial matching with the equivalent tissue thickness required by the radiotherapy plan. This mechanism fundamentally reduces dose perturbations caused by surface geometry irregularities or tissue inhomogeneities, allowing for more reliable reproduction of the dose distribution in the treatment plan during actual irradiation, and reducing the risk of underdose or overdose in near-surface and interface regions.