Release Notes V9.2

Sim4Life V9.2 Release Notes

Sim4Life V9.2 generates solver-ready anatomical models directly from MRI/CT scans with third-generation AI tools, adds a broadband skin model for absorbed power density from 10 to 110 GHz, and introduces a DBS/sEEG electrode generator.

Items apply to both editions unless tagged (Desktop) or (Web). The web edition was released first, on 7 October 2025. Desktop hardware and OS: see System Requirements.

Known Issues (V9.2)

Instability for some rare dispersive material configurations.
Job priorities may not correspond to the job execution order (fixed in V9.6).
Potentially decreased accuracy in rare cases for the sensor combiner of the far-field sensor.

V9.2 · 9 December 2025

Desktop (text version) · Web V9.2, Platform V1.86.0, 7 October 2025 (platform notes)

Added

Modeling

Third-generation deep learning model labels head, neck, and torso tissues from MRI/CT scans and generates solver-ready models from raw images, with about 50% less setup time and user interaction than before.
DBS and sEEG electrode generator: parameterized electrodes with adjustable diameter, contact length, spacing, arc angle, segmentation, and tip offset, interactively or from Python.
(Desktop) Angle measurement tool, and a Sample Surface tool that generates points on a meshed surface.
(Desktop) The 10-10 system tool includes the outermost ring of the specification, and surfaces generated during segmentation get material tags automatically.
(Desktop) Mesh smoothing in the Octree Mesher, and a preferred mouse-wheel zoom direction in the 3D view.

Simulation

Broadband Skin Power Absorption Model, implementing Christ et al. (2025) as adopted by IEC/IEEE standards, for absorbed power density from 10 to 110 GHz.
(Desktop) T-increase thermal transient simulations, focused on temperature rise rather than absolute temperature.
(Web) OpenFOAM plugin: run fluid and small-strain mechanics solvers from the Plugin Manager, with all dictionaries, logs, and results stored in the Sim4Life project.

Optimization(Web)

Upgraded optimizer combining surrogate modeling with a multi-objective genetic algorithm (MOGA).
Pareto front visualization of trade-offs between objectives such as safety, efficacy, and energy efficiency. In a spinal cord stimulation study, it found pulse shapes with the same neural recruitment at up to 5x lower energy.

Analysis

(Desktop) Entity groups that are not part of a simulation can be dragged into the masking filter.

Virtual Population

(Desktop) Upgraded ViP models (Duke, Ella, Fats, Billie, Thelonious, and Yoon-sun) deform more realistically at the joints in extreme postures and have additional spinal joints for neck and back bending.

Help Center(Web)

Integrated Help Center connected to Application Support, with opt-in sharing of logs and screenshots.

Fixed

(Desktop) Sim4Life connects to the material database when the Windows user name contains non-ASCII characters.
(Desktop) The 3D scaling bar no longer overlaps modeling-tool hints.
(Desktop) Closed coils are no longer flagged as open in low-frequency magneto vector potential simulations.
(Desktop) Changing the MIP Viewer slice index moves the projection slice.
(Desktop) Label field and image properties no longer disappear from the Controller.
(Desktop) Faster spline and edge rendering, and no more crashes when orbiting the 3D view repeatedly.
(Desktop) The centerline tool accepts mesh points as source or target.
(Desktop) Grids are recalculated after clearing results and resetting voxels of a low-frequency magneto-quasi-static simulation.
(Desktop) Planar cuts of static ViP models update grid and bounding box dimensions, and all entities of a group stretch correctly.
(Desktop) Transformations of imported HOC neurons are applied correctly when interpolating potential fields.
(Desktop) GPU-accelerated CEM43 calculations are accurate, and CEM43 values are no longer overwritten when Arrhenius recording is also enabled.

Note

(Desktop) V9.2 is the last version that supports NVIDIA Maxwell GPUs with the Acceleware libraries.