Brain Imaging Simulator | mysimulator.uk

Scan mode

Scan speed 1.0×

Activity threshold 35%

Task paradigm freq 0.15 Hz

Slice progress

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Active voxels

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Peak ΔBOLD

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Scan elapsed

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How it works

The volume is a lattice of voxels sampled inside a brain-shaped envelope. In Structural mode a thin acquisition plane sweeps through the lattice slice by slice — exactly how an MRI or CT scanner builds a 3D image one cross-section at a time, using tissue-dependent signal (grey vs white matter) rather than a single flat X-ray. In Functional mode the same volume shows a simulated BOLD (Blood-Oxygen-Level-Dependent) signal: a handful of cortical "activation" regions oscillate with a task/rest paradigm, and only voxels whose signal crosses your threshold are lit — the same statistical-thresholding step real fMRI analysis pipelines (SPM, FSL) apply before drawing an activation map.

BOLD(v,t) = S0 + A·G(v)·max(0, sin(2·pi·f·t))
G(v) = exp(-|v - c|^2 / (2·sigma^2))

Scan mode — Structural sweeps an acquisition plane through static tissue (MRI/CT-style); Functional overlays a time-varying activity signal (fMRI/PET-style) instead.
Axial / Sagittal / Coronal — the three standard imaging planes; changing the axis changes which direction the slice plane travels through the volume.
Scan speed — how fast the acquisition plane sweeps across the volume (slices per second).
Activity threshold — the ΔBOLD cutoff below which a voxel is treated as noise and hidden, matching statistical thresholding of a real activation map.
Task paradigm freq — how often the simulated task/rest block repeats, driving the oscillation of each activation center's signal.

Real-world relevance: this two-mode split mirrors how neuroimaging actually works — structural scans (MRI, CT) map anatomy, while functional scans (fMRI, PET, EEG/MEG) map the brain activity layered on top of that anatomy, and clinicians/researchers routinely combine both.

White matter Grey matter Scan plane High BOLD activity

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