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Prepare an X-ray microscopy (XRM) sample by matching the preparation to the material, feature of interest, required resolution, specimen integrity, and any later microscopy. Some specimens can be scanned intact and unsectioned; others need fixation, staining, embedding, or special immobilization. There is no universal holder, adhesive, stain, or sequence that works for every instrument and sample.
The short answer: preparation is a decision, not a recipe
X-ray microscopy creates three-dimensional information from X-ray attenuation or other contrast mechanisms, so it can reveal internal structure without physically cutting the specimen. That changes the first preparation question: do not section or chemically process a sample until you know the target cannot be resolved in its native state.
Preparation is justified when the specimen does not fit the instrument, moves during rotation, lacks usable contrast, requires a particular biological treatment, or must be compatible with a later method such as scanning electron microscopy (SEM), focused ion beam SEM (FIB-SEM), transmission electron microscopy (TEM), or synchrotron imaging. Fixation, staining, embedding, and mounting may improve stability or contrast, but they can also alter morphology, add interfaces, create artifacts, or compromise a downstream experiment.
The safest workflow is therefore staged: define the imaging question, decide whether the specimen can remain intact, mount it for stable rotation, collect a lower-resolution overview, inspect for preparation problems, and only then commit to a higher-resolution or destructive acquisition.
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Define the imaging question before preparing the specimen
Write down the imaging decision before choosing a chemical treatment or holder. The same sample may need different preparation for a whole-organ overview, a micron-scale inclusion, a fragile biological structure, or a later correlative experiment.
| Question | Why it changes preparation | Decision to record |
|---|---|---|
| What material is being imaged? | Density, composition, water content, and heterogeneity determine whether native contrast is adequate and whether the specimen can tolerate handling. | Material class, expected interfaces, and any regions that must not be altered. |
| Which feature must be resolved? | A broad internal map can be obtained from an intact object, while a small region may require a targeted high-resolution scan and tighter positioning. | Feature location, approximate scale, and whether surrounding context is needed. |
| Must the specimen remain intact? | Sectioning, trimming, drying, or chemical processing can destroy spatial relationships needed for later interpretation. | Preserve native state, preserve a fixed state, or permit destructive preparation after screening. |
| Is this a standalone scan? | For a one-time XRM result, preparation can be optimized for stability and contrast alone. | Standalone acquisition, with its acceptance criteria. |
| Will another method follow? | ROI location, orientation, labels, and chemical history can determine whether the later SEM, FIB-SEM, TEM, or synchrotron dataset is usable. | Downstream method, required material state, and how the region will be relocated. |
| What are the instrument limits? | Sample dimensions, holder geometry, rotation clearance, and any in-situ hardware constrain mounting before imaging begins. | Instrument model or facility, sample envelope, and permitted holder configuration. |
These answers should be part of the submission notes sent to the facility. They prevent a convenient preparation from silently changing the question the scan was supposed to answer.
Choose between a native, minimally prepared, and processed sample
Native or intact preparation
Try the native specimen first when the target has sufficient X-ray contrast, the dimensions fit the sample envelope, and the specimen can be held without movement. ZEISS describes XRM of unprepared specimens and emphasizes the value of retaining intact context. An intact scan can preserve interfaces, inclusions, cracks, pores, and the three-dimensional relationship between structures that would be lost during sectioning.
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Minimal mechanical preparation
Minimal preparation is appropriate when the specimen is already compatible with the instrument but needs a defined shape or stable contact with the holder. Typical decisions include removing material that prevents rotation, orienting a long sample along the rotation axis, or isolating a region while retaining enough surrounding context for interpretation. Do not trim solely to make the sample look tidy; first confirm the clearance and the field of view with the facility.
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Processed preparation
Processing may be necessary when native contrast is insufficient, the biological material is too mobile, or a later method requires a particular chemical or physical state. Fixation can immobilize biological structures. Staining can change attenuation differences between tissues or compartments. Embedding can support a fragile specimen and make handling easier. Each intervention can also cause shrinkage, swelling, extraction, uneven penetration, interfaces, or other artifacts.
The appropriate sequence depends on the specimen and the downstream method. The cited application guidance does not establish universal fixatives, stains, concentrations, embedding media, dehydration schedules, or scan settings, so those details must come from a protocol validated for the material and the specific instrument.
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For biological samples, plan preparation as part of the entire workflow
Biological XRM is not a separate isolated step when the specimen will later be examined at higher resolution. The preparation must preserve the information needed by every method in the chain.
Fixation
Use fixation only when the biological question and later handling require it. Record the fixative, exposure time, temperature, and any wash or storage steps in the sample history supplied to the facility. Even when fixation improves stability, it can change dimensions or attenuation relative to living or freshly collected tissue.
Staining and contrast enhancement
A stain can increase the difference between structures that are otherwise difficult to separate in XRM. It can also penetrate unevenly, concentrate at boundaries, or obscure a later label. Before staining the whole specimen, establish whether the target is visible without it and whether the downstream method tolerates the selected chemistry. The ZEISS life-science guidance identifies contrast generation and artifact reduction as central topics, but the reviewed application page does not provide a complete stain protocol.
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Embedding
Embedding supports fragile or irregular samples and can reduce motion, yet the embedding medium becomes part of the reconstructed volume. Voids, bubbles, cracks, or a strong interface between specimen and medium can complicate segmentation. Choose the medium only after checking its compatibility with the X-ray energy range, holder, temperature, and later microscopy; no single medium is established as universal by the available guidance.
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If XRM will guide SEM, FIB-SEM, TEM, or synchrotron acquisition, perform the least disruptive preparation that still gives a useful overview. A non-destructive XRM scan can screen for defects, incomplete staining, or a misplaced target before expensive sectioning or high-resolution acquisition. Preserve the sample orientation and keep a record of the coordinate system used to identify the region of interest.
Decide whether to scan the whole specimen or a region of interest
Whole-sample survey
Start broadly when the target location is uncertain or the surrounding context matters. A lower-resolution three-dimensional map can reveal internal heterogeneity, damage, bubbles, cracks, or preparation gradients. It also shows whether the specimen is positioned safely throughout rotation.
Targeted high-resolution acquisition
After the survey, select the region of interest (ROI) and acquire the higher-resolution dataset only where it adds value. This approach reduces the risk of spending the full acquisition time on a damaged or poorly stained area. For a later destructive method, the overview can guide trimming or sectioning while preserving a record of the original context.
When not to trim first
Do not remove surrounding material merely to expose a suspected ROI if that material provides orientation or may contain an unexpected structure. Survey first unless the facility confirms that the complete specimen cannot fit or rotate safely.
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Mount and immobilize the specimen for stable rotation
Movement during rotation produces blur, double edges, reconstruction errors, and sometimes complete loss of the ROI. The mount must resist translation and vibration while leaving the X-ray path and rotation envelope clear.
Check the instrument envelope
- Confirm maximum sample dimensions and mass with the facility.
- Verify the holder geometry and the distance from the rotation axis.
- Check clearance at the largest planned rotation angle, including protruding features and any in-situ rig.
- Ask whether the instrument requires a particular holder interface, capillary, cartridge, or environmental enclosure.
- Confirm whether the mount can be removed without damaging a specimen reserved for later work.
Choose immobilization without assuming a universal adhesive
A mounting medium or adhesive must be compatible with the sample, the X-ray beam, the holder, the temperature, and any downstream method. An adhesive that holds a dry engineering part may swell, outgas, contaminate, or obscure a biological sample. Conversely, a medium suitable for a biological specimen may not provide enough rigidity for a heavy or long object. The reviewed sources do not endorse one product or mounting material across sample types.
Describe the proposed mount to the facility before applying it. Include contact points, expected thickness, curing or drying conditions, and whether the mount can be dissolved or removed. If an in-situ experiment is planned, the rig itself may define the allowable mounting method.
Inspect the sample before the high-resolution scan
Use a low-resolution or scout acquisition to test both the specimen and the preparation. ZEISS describes screening for imperfections and staining problems before targeting later acquisitions.
What the overview should reveal
- Whether the complete specimen remains inside the field of view throughout rotation.
- Whether the sample moves relative to the holder.
- Whether bubbles, cracks, voids, folds, or detached pieces are present.
- Whether a stain or embedding medium penetrated evenly enough for the intended interpretation.
- Whether the suspected ROI is present and in a position that can be reached at the desired scale.
- Whether dense holder or mounting features create streaks, shadows, or other artifacts.
If the scout scan exposes a problem, correct the preparation or choose another ROI before committing to the long acquisition. Keep the scout data; it documents the specimen state before any later trimming or destructive processing.
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Confirm contrast, scan mode, and reconstruction with the facility
Before finalizing preparation, ask the operator which imaging mode is appropriate. The ZEISS life-science application page distinguishes hard and soft X-ray imaging and identifies immobilized-sample tomography, contrast generation, artifact reduction, and reconstruction as relevant considerations. Those categories are not a substitute for instrument-specific settings.
Do not infer an energy, exposure, voxel size, stain concentration, number of projections, or reconstruction filter from a general application page. The detailed downloadable protocol associated with the reviewed page was not available, and the evidence does not support a universal parameter set. Obtain the facility’s current protocol for the exact instrument, detector, holder, specimen composition, and intended spatial scale.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical preparation workflow
- Write the imaging objective. State the material, target feature, required spatial scale, need for intact context, and whether another method follows.
- Measure and document the specimen. Record dimensions, mass if relevant, orientation marks, storage condition, and any visible damage. Compare these with the facility’s sample envelope.
- Request a preparation review. Send the facility photographs or drawings, the intended ROI, downstream requirements, and the proposed holder or mount before processing.
- Test native imaging when feasible. If contrast and dimensions appear adequate, keep the specimen intact and avoid unnecessary fixation, staining, embedding, or sectioning.
- Select only the required processing. If stability or contrast is inadequate, choose fixation, staining, embedding, or mechanical trimming for a stated reason and document every treatment.
- Prepare the mount. Immobilize the specimen while maintaining rotation clearance, preserving the ROI, and avoiding materials incompatible with the instrument or later microscopy.
- Verify the mount mechanically. Check for wobble, loose fragments, curing movement, bubbles, and protrusions. Confirm that the planned rotation range is unobstructed.
- Acquire a scout or overview map. Use it to assess motion, contrast, artifacts, specimen completeness, and ROI location before high-resolution acquisition.
- Correct or retarget. If the overview shows movement, staining defects, damage, or an inaccessible ROI, change the mount or select another region before proceeding.
- Run the final scan under local settings. Use the facility’s validated choices for hard or soft X-ray mode, contrast strategy, artifact reduction, and reconstruction.
- Preserve the record. Save preparation notes, mount orientation, scout data, final scan settings, and the coordinates or images used to identify any downstream ROI.
Compare preparation paths by the decision they serve
| Preparation path | Use when | Main benefit | Main risk or limitation |
|---|---|---|---|
| Native intact specimen | Target contrast is adequate and the sample fits and can be immobilized. | Preserves three-dimensional context and avoids processing artifacts. | Natural contrast or movement may limit segmentation or resolution. |
| Minimal mechanical preparation | The sample needs clearance, orientation, or a stable contact surface. | Retains most native information while improving handling. | Trimming can remove context or the ROI if done before a survey. |
| Fixed specimen | Biological structure must be immobilized or preserved for handling. | Improves stability and can make a later workflow practical. | May alter dimensions, attenuation, or compatibility with later methods. |
| Stained specimen | Native contrast does not separate the structures of interest. | Can increase contrast between tissues or compartments. | Uneven penetration, boundary accumulation, and chemical incompatibility can create artifacts. |
| Embedded specimen | A fragile or irregular sample needs mechanical support. | Reduces motion and simplifies handling. | Voids, bubbles, interfaces, and medium-related contrast enter the volume. |
| Overview scan before destructive work | A later SEM, FIB-SEM, TEM, or synchrotron acquisition is planned. | Screens quality and locates a useful ROI without first cutting the specimen. | Requires enough orientation and documentation to relocate the ROI. |
These are decision categories, not a tested ranking. The best path is the one that satisfies the imaging question while preserving the information required afterward.
Troubleshoot common preparation failures
| Observed problem | Likely preparation cause | Corrective action |
|---|---|---|
| Blurred or doubled edges | Specimen or mount moved during rotation. | Increase mechanical support, shorten unsupported spans, and verify the holder before repeating the scan. |
| Part of the sample disappears at some angles | Rotation clearance or field of view is insufficient. | Reorient or carefully trim only after confirming the intended ROI and the instrument envelope. |
| Streaks or severe shadows | Dense holder, mount, or concentrated stain lies in the beam path. | Ask the facility whether a different orientation, holder, or contrast strategy is appropriate. |
| Bright rings, voids, or gaps around the specimen | Embedding bubbles, cracks, shrinkage, or poor contact. | Inspect the mount, improve preparation, and record the artifact rather than interpreting it as specimen structure. |
| Target is present but not separable | Insufficient native contrast, inappropriate imaging mode, or uneven processing. | Discuss contrast generation and hard-versus-soft X-ray options with the operator before adding a stain. |
| Later microscopy cannot use the ROI | ROI was not documented, orientation changed, or the preparation is incompatible with the downstream method. | Use the overview map and permanent orientation records; agree on downstream constraints before processing the next specimen. |
Prepare specifically for correlative and destructive follow-up
When XRM precedes another method, treat the scan as a map rather than merely a final image. The overview can identify a high-quality region, reveal defects that would waste a later run, and guide targeted trimming. Keep the specimen in a known orientation, mark the holder or container when permitted, and preserve the relationship between the overview volume and the physical sample.
Ask the downstream facility whether fixation, staining, embedding, dehydration, or mounting will prevent its method from working. A preparation that produces excellent XRM contrast may remove volatile components, introduce contamination, or make sectioning difficult. Conversely, preserving every native component may leave the XRM contrast too weak. Resolve that trade-off before committing the only specimen.
What to send the XRM facility before booking
- Material description and biological or engineering context.
- Specimen dimensions, approximate mass, and photographs from several orientations.
- Target feature, expected location, and whether whole-sample context is required.
- Required spatial scale or the smallest feature that must be distinguished.
- Native, fixed, stained, embedded, or otherwise processed state, including complete chemical history.
- Whether the sample must remain intact after XRM.
- Planned downstream method and any restrictions on chemicals, drying, radiation exposure, or mounting media.
- Proposed holder or immobilization approach, with a drawing if the geometry is unusual.
- Need for an overview scan, an ROI scan, in-situ hardware, or a particular environmental condition.
Ask the facility to confirm the holder, rotation clearance, sample envelope, allowable materials, and scout-scan procedure in writing. This is more reliable than adapting a mounting recipe from an unrelated specimen.
Training and protocol availability
Bruker describes an “X-ray Microscopy Basics” course covering sample preparation, acquisition, reconstruction, and visualization. Its page lists the 2026 sessions as cancelled, so it should not be treated as currently available training without checking for a replacement schedule. In practice, the instrument facility’s current protocol remains the controlling document because preparation limits differ by model, holder, and sample.
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Quick Recap
Preparation checklist
- Imaging question and target feature are written down.
- Native imaging has been considered before sectioning or chemical processing.
- Any fixation, staining, embedding, drying, or trimming has a stated purpose and is fully documented.
- Downstream microscopy requirements have been checked before processing.
- Holder geometry, sample envelope, rotation clearance, and in-situ constraints are confirmed.
- Immobilization prevents movement without blocking the beam or damaging the ROI.
- A scout or overview scan is planned before the final high-resolution acquisition.
- Contrast, artifact-reduction, and reconstruction settings will come from the local instrument protocol.
- Orientation, ROI coordinates, preparation history, and scan records will be preserved for later interpretation.
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