The best X-ray microscopy (XRM) preparation is the least preparation that still delivers the contrast, stability and resolution your imaging question requires. Start by deciding what must be resolved, whether the specimen must remain intact, and whether the scan is a standalone result or a map for later electron, synchrotron or other work. Some samples can be scanned in their native state; others need fixation, staining, embedding or careful mounting. None of those treatments is universal, and each can change the specimen and the data.
Start with the imaging question
Preparation should follow the measurement, not the other way around. Write down the feature you need to see, its approximate size, the surrounding context that matters, and what will happen to the specimen after XRM. XRM can reveal internal three-dimensional structure without cutting the sample, so an intact scan may answer the question more faithfully than a sectioned or chemically processed one.
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Four questions to answer before touching the specimen
- What material is being imaged? A mineral, polymer, electronic component, plant tissue and animal tissue interact with X-rays differently. Density, composition, water content and internal voids determine whether natural contrast is sufficient.
- What feature must be resolved? A whole-object map, a defect, a pore network and a cellular structure impose different demands on field of view, stability and contrast.
- Must the specimen remain intact? If context, interfaces or spatial relationships are important, avoid sectioning until you know it is necessary.
- Is XRM the final measurement? If the specimen will later go to SEM, FIB-SEM, TEM, synchrotron imaging or another destructive method, the XRM scan should preserve the region of interest and document its location.
These answers determine whether you should preserve the native specimen, process it for contrast, scan the complete object, or prepare a targeted region.
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Not automatically. ZEISS describes native, unprepared specimens imaged with XRM and presents non-destructive imaging as a way to retain sample context. If the feature has adequate attenuation or phase contrast in the intact object and the specimen fits the instrument’s sample envelope, sectioning may add risk without adding information.
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Sectioning or chemical processing becomes reasonable when the target cannot be distinguished at the required scale, when the object exceeds the available field of view, or when a downstream method requires a specially prepared surface. Treat that as a decision to validate with a scout scan or facility consultation rather than as a default rule.
| Approach | Use it when | Main benefit | Main risk or cost |
|---|---|---|---|
| Native, intact specimen | Natural contrast is adequate and internal context matters | Preserves interfaces, geometry and the option of later workflows | Low contrast, motion or excessive size may limit the scan |
| Sectioned or trimmed specimen | The target must fit a smaller field of view or expose a surface | Can improve access to a region or enable a later surface-sensitive method | Removes context and may destroy the exact region needed for correlation |
| Fixed, stained or embedded specimen | Biological contrast or mechanical stability requires processing | May improve immobilization or distinguish structures | Processing can shrink, swell, stain unevenly or introduce artifacts |
The table is a decision framework, not a ranking. The cited application guidance does not establish a universal stain, fixative, embedding medium or section thickness.
Choose preparation for the complete workflow
Standalone XRM
For a scan that will be interpreted on its own, prioritize the state that best represents the question. A native specimen is often preferable when the aim is to measure intact morphology, interfaces or internal defects. Processing is justified only when it produces usable contrast or prevents movement that would otherwise invalidate the reconstruction.
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XRM as a prescreen for another method
A non-destructive overview can show whether a specimen is intact, where a feature lies and whether preparation introduced defects. ZEISS describes screening for imperfections and staining problems before higher-resolution or multimodal acquisition. That makes XRM useful before trimming, sectioning or committing to an expensive synchrotron or electron-microscopy run.
Whole specimen versus region of interest
When location and context are uncertain, map broadly first. A low-resolution three-dimensional scan can identify the target and provide coordinates for a later high-resolution acquisition. If the target is already known and the facility supports the required geometry, a prepared region of interest may reduce scan time and data volume, but document what was removed and how the ROI relates to the original object.
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A practical preparation workflow
1. Define the measurement and acceptance criteria
Record the smallest feature that must be separated, the dimensions of the object, the required volume, and whether quantitative measurements will be made. Decide in advance what would make a scan unusable: motion, insufficient contrast, truncation, beam-hardening artifacts, staining gradients or loss of biological context.
2. Ask the facility whether preparation is needed
Send the facility the material description, dimensions, approximate density or composition, moisture state, and any downstream method. Ask about the instrument’s sample envelope, rotation clearance, holder geometry, in-situ hardware, permissible liquids and vacuum or environmental limits. Requirements vary with instrument, specimen dimensions, composition and desired spatial scale.
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3. Test the native specimen first when practical
Do not fix, stain, embed or section solely because those steps are common in another microscopy workflow. If an intact specimen can be immobilized and its target is visible, the native scan preserves the most context and leaves more options for later analysis.
4. Select processing only for a defined problem
For biological material, fixing can stabilize tissue, staining can increase differentiation, and embedding can support fragile structures. Each intervention may also alter dimensions, attenuation or chemical distribution. Choose the minimum processing that addresses the identified problem and record the protocol, timing and specimen state.
5. Trim only when geometry or resolution requires it
Trimming can bring a target into the field of view or permit a higher-resolution acquisition. Before cutting, use a broad scan or other non-destructive inspection to confirm that the selected region contains the feature of interest. Keep the removed material and document orientation if later correlation is planned.
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6. Immobilize without obscuring the target
The specimen must not move during rotation. Position it so the center of interest is within the usable field, avoid contact that compresses delicate features, and keep mounting material outside the region being measured whenever possible. The correct adhesive, capsule, tube or holder depends on the instrument and sample; the reviewed guidance does not endorse one universal product.
7. Run a low-resolution scout scan
Inspect the three-dimensional map for motion, bubbles, cracks, truncation, unexpected dense inclusions, staining gradients and other preparation artifacts. Confirm that the target is where expected and that the specimen remains stable through rotation. Use the result to select a high-resolution ROI or to stop and revise preparation.
8. Confirm contrast and acquisition parameters locally
Life-science XRM guidance identifies hard versus soft X-ray imaging, immobilized-sample tomography, contrast generation, artifact reduction and reconstruction as relevant topics. It does not provide a universal set of energies, concentrations or scan settings. Obtain the facility’s protocol for the exact instrument, detector, sample environment and specimen type rather than transferring numbers from another setup.
9. Preserve orientation and metadata
Photograph the mounted specimen, mark a reference direction, measure its dimensions, and record preparation dates, chemicals, concentrations, exposure times, holder identity and ROI coordinates. Save the scout data with the final dataset. Those records are essential if the specimen moves to another microscope or is sectioned after XRM.
Biological samples: fixation, staining and embedding
Biological preparation is a chain of trade-offs rather than a recipe. Fixation may improve mechanical stability but can change hydration and dimensions. Staining may increase contrast between structures but can be non-uniform or create dense regions that complicate reconstruction. Embedding may support a fragile sample while adding a surrounding material with its own attenuation and interfaces. Mounting can introduce bubbles, compression or movement.
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Choose a treatment by asking which failure it prevents and what information it might destroy. If a later electron or synchrotron acquisition has strict chemical or dehydration requirements, coordinate the entire sequence before XRM. A preparation that produces a clear XRM image may be unsuitable for the next method, and a method-compatible specimen may need a different contrast strategy.
Hard and soft X-ray considerations
The appropriate X-ray regime depends on the specimen and the contrast mechanism available on the instrument. Hard and soft X-ray approaches have different penetration and contrast behavior, and the facility may use attenuation, phase effects or another method. Do not infer an energy, filter, stain concentration or exposure from a general application page; request instrument-specific guidance.
How to mount a sample for X-ray tomography
Mounting has two jobs: hold the sample rigidly during rotation and keep the holder from interfering with the measurement. A mount that is secure but off-center can cause clipping or excessive path-length variation; a mount that is chemically incompatible can swell, outgas or contaminate an in-situ environment.
| Mounting decision | Check before the scan | If the check fails |
|---|---|---|
| Holder geometry | Diameter, height, rotation clearance and detector distance | Choose a compatible holder or reduce the specimen size only after documenting the ROI |
| Immobilization | No visible movement, wobble or compression during rotation | Revise support, orientation or clamping with facility approval |
| Mounting medium | Compatibility with the sample, X-ray path and environmental conditions | Use a facility-approved alternative; do not substitute a generic glue by assumption |
| In-situ hardware | Clearance for heaters, fluid cells, load stages or other accessories | Confirm the complete assembly with the instrument operator |
| ROI visibility | The mount does not cover or surround the target with avoidable dense material | Reorient or remount while preserving the reference direction |
Because holder recommendations are instrument-specific, the safest next step is to send the facility a photograph and dimensional drawing of the proposed mount before preparing the final specimen.
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Preparation can improve contrast and simultaneously create artifacts. Uneven staining can look like real structure; bubbles can mimic voids; drying or shrinkage can open gaps; dense mounting material can produce streaks or beam-hardening effects; and slight motion can blur all reconstructed features.
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- Check for spatially varying contrast. Compare the center and edge of the specimen in the scout volume. A gradient may reflect processing rather than biology.
- Look for mechanical changes. Compare dimensions with pre-preparation photographs or measurements when available.
- Separate mount artifacts from specimen features. Rotate the volume and inspect whether suspicious structures align with the holder, adhesive or air interface.
- Use controls where possible. An untreated or differently processed companion specimen can reveal whether a feature is preparation-induced.
- Stop when the scout scan is inconclusive. Increasing resolution will not correct movement, truncation or a fundamentally inadequate contrast mechanism.
Decision matrix: which path fits your sample?
| Your situation | Starting path | Why | What to verify |
|---|---|---|---|
| Intact object with visible internal contrast | Native scan, minimal mounting | Preserves context and avoids processing artifacts | Stability, field of view and target visibility |
| Fragile biological specimen | Facility-approved immobilization; consider fixation only for a defined stability problem | Prevents motion while limiting chemical changes | Dimensional change, hydration and downstream compatibility |
| Target is small and location is unknown | Whole-sample low-resolution map, then ROI scan | Retains context while concentrating resolution where needed | Coordinate system, orientation and ROI transfer |
| Target lacks sufficient natural contrast | Evaluate contrast-generating processing with the facility | Processing may separate structures that native XRM cannot | Uniformity, artifacts and compatibility with later methods |
| Planned SEM, FIB-SEM, TEM or synchrotron follow-up | Design XRM and downstream preparation together | Prevents the overview scan from compromising the final method | Chemical restrictions, destructive steps and registration markers |
| In-situ experiment | Instrument-specific holder and environmental assembly | Generic mounts may not fit or remain stable under operating conditions | Clearance, sealing, pressure, temperature and motion limits |
Common failure modes and fixes
| Symptom | Likely preparation cause | Corrective action |
|---|---|---|
| Blurring or doubled edges | Movement during rotation | Rework immobilization, reduce unsupported length and repeat the scout scan |
| Target clipped at the edge | Specimen or ROI is outside the usable field | Recenter, change magnification or trim only after confirming the target location |
| Streaks or severe reconstruction artifacts | Dense inclusions, holder interference, bubbles or insufficient angular stability | Inspect the raw projections and remount or revise processing with the operator |
| Patchy biological contrast | Uneven staining, penetration or drying | Assess processing uniformity and avoid interpreting the gradient as structure |
| Specimen dimensions no longer match the native state | Shrinkage, swelling, dehydration or embedding | Record the change, use appropriate controls and state the processed condition in results |
| Later correlative method cannot locate the ROI | Orientation or coordinates were not preserved | Use fiducial features, photographs and a documented coordinate system before sectioning |
Questions to settle with the imaging facility
- What are the maximum sample dimensions and mass for the intended objective?
- What holder geometries and in-situ accessories are available?
- Is the sample scanned in air, liquid, vacuum or another environment?
- Are there restrictions on adhesives, solvents, water, fixatives or embedding media?
- Will the requested resolution require a smaller ROI or a different objective?
- Can the facility perform a scout scan before committing to high-resolution acquisition?
- How should the specimen be labeled, oriented and returned for downstream work?
- Which reconstruction artifacts are common for this material and how should raw projections be retained?
Provide the operator with dimensions, photographs, material history and the intended downstream method. A short consultation before processing is usually more valuable than discovering a geometry or compatibility problem after preparation.
Training and protocol limits
Vendor application pages are useful for understanding workflow concepts, but they are not a substitute for a protocol validated on your sample and instrument. The reviewed life-science application page identifies immobilization, contrast, artifact reduction and reconstruction as preparation topics, while its detailed downloadable protocol was not available in the page examined. Do not treat that page as evidence for exact energies, stain recipes or scan settings.
A training page from Bruker describes an XRM Basics course covering sample preparation, acquisition, reconstruction and visualization. Its listed 2026 sessions are marked cancelled, so availability must be checked directly before relying on it as a current course option.
Bottom line
Prepare an XRM sample by working backward from the feature and the full imaging workflow. First test whether an intact, native specimen already provides enough contrast. If not, select the smallest processing step that solves the specific contrast or stability problem, verify holder geometry and immobilization with the facility, and use a low-resolution three-dimensional scan to screen quality and locate the ROI. Fixation, staining, embedding, sectioning and mounting are tools with consequences—not universal steps—and the correct choices depend on the specimen, instrument and any microscopy that follows.
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