Brain MRI Explorer

One position. Five ways of seeing it.

Preparing images…

MRI sequence

Select a sequence to compare this exact location.
Choosing one moves the crosshair inside it.
Sequence guideNormal tissue at one shared point

Signal depends on scan settings and display window. Use these patterns to compare normal tissue in this one healthy-volunteer example, not to interpret a scan.

Typical normal brain tissue appearance by MRI sequence
SequenceWhat the name meansCerebrospinal fluid (CSF)White and gray matter
T1-weightedDarkWhite matter is brighter than gray matter.
T2-weightedBrightGray matter is brighter than white matter.
Fluid-attenuated inversion recoverySuppressed, so darkT2-like contrast: gray matter is brighter than white matter.
Diffusion-weighted imagingUsually darkBoth are intermediate; brightness varies with diffusion weighting and display.
Apparent diffusion coefficient mapBrightGray matter is usually brighter than white matter on a conventional grayscale map.

Read DWI with ADC. DWI brightness alone does not establish a cause or diagnosis. Compare it with ADC at the same point; display settings and technical effects still matter.

Guided comparison: normal ventricular CSF

Place the crosshair in a labelled lateral ventricle, then switch through the same point.

The controls unlock when the images are ready.

Axial

Top down
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ARLP

Coronal

Front to back
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SRLI

Sagittal

Side view
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SAPI

3D anatomy

Drag to rotate · scroll to zoom
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Loading real anatomy…
Crosshair —Voxel —Signal —

How to use: tap or click an image to move the crosshair. The other views jump to the same point. Use the sliders, or the mouse wheel on a computer, to move through slices.

Data credits and licenses

Changes we made: we converted each scan to a web format and scaled its brightness for display. We made 3D surfaces from the brain and prostate labels. We computed the brain ADC map from the diffusion data. We resampled the knee to 0.7 mm. The four cases come from different people and datasets. The data creators do not endorse this tool.