science

Volumetric Electron Microscopy

Volumetric Electron Microscopy is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Volumetric Electron Microscopy rather than just read about it. In short: Volumetric Electron Microscopy (Volume EM) is an electron microscopy method used to generate 3D reconstructions of thick (>500 nm) samples. The initial role of electron microscopes in imaging two-dimensional slices (TEM) or a specimen surface (SEM with secondary electrons) has also increasingly expanded into the depth of samples.

Key takeaways

Volumetric Electron Microscopy belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Volumetric Electron Microscopy to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Volumetric Electron Microscopy from memory before moving on to harder problems.

Reference excerpt

Volumetric Electron Microscopy (Volume EM) is an electron microscopy method used to generate 3D reconstructions of thick (>500 nm) samples. The initial role of electron microscopes in imaging two-dimensional slices (TEM) or a specimen surface (SEM with secondary electrons) has also increasingly expanded into the depth of samples. An early example of these volume EM workflows was simply to stack TEM images of serial sections cut through a sample. The next development was virtual reconstruction of a thick section (200-500 nm) volume by backprojection of a set of images taken at different tilt angles - TEM tomography.

To acquire volume EM datasets of larger depths than TEM tomography (micrometers or millimeters in the z axis), a series of images taken through the sample depth can be used. For example, ribbons of serial sections can be imaged in a TEM as described above, and when thicker sections are used, serial TEM tomography can be used to increase the z-resolution. More recently, back scattered electron (BSE) images can be acquired of a larger series of sections collected on silicon wafers, known as SEM array tomography. An alternative approach is to use BSE SEM to image the block surface instead of the section, after each section has been removed. By this method, an ultramicrotome installed in an SEM chamber can increase automation of the workflow; the specimen block is loaded in the chamber and the system programmed to continuously cut and image through the sample. This is known as serial block face SEM. A related method uses focused ion beam milling instead of an ultramicrotome to remove sections. In these serial imaging methods, the output is essentially a sequence of images through a specimen block that can be digitally aligned in sequence and thus reconstructed into a volume EM dataset. The increased volume available in these methods has expanded the capability of electron microscopy to address new questions, such as mapping neural connectivity in the brain, and membrane contact sites between organelles.

References

Worked examples

Example 1 — a first encounter with Volumetric Electron Microscopy

Start with the simplest possible case. Write down what Volumetric Electron Microscopy claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Volumetric Electron Microscopy before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Volumetric Electron Microscopy ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Volumetric Electron Microscopy

In research: Volumetric Electron Microscopy appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Volumetric Electron Microscopy in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Volumetric Electron Microscopy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Electron microscopy, Electron microscopy techniques, Microscopes, so understanding it makes those chapters shorter.
In everyday life: Look for Volumetric Electron Microscopy outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Volumetric Electron Microscopy in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Volumetric Electron Microscopy means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Volumetric Electron Microscopy out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Volumetric Electron Microscopy in simple terms?

Why does Volumetric Electron Microscopy matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Volumetric Electron Microscopy?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Volumetric Electron Microscopy.