In Vivo Imaging FAQ: Common Questions Answered

In Vivo Imaging: The Questions Labs Ask Most

Small animal in vivo imaging can look deceptively simple from the outside — put the mouse in the machine, take a picture — yet every new user quickly runs into practical questions about signal, sensitivity, throughput and cost. Because these small animal imaging questions come up again and again in emails, demonstrations and procurement discussions, we have collected the most common ones in this in vivo imaging FAQ.

If you are still at the selection stage, start with our guide to choosing an in vivo imaging system and the comparison of bioluminescence, fluorescence and chemiluminescence. Then come back here for the short answers.

Quick Answers at a Glance

Question	Short Answer
Which labels work for in vivo imaging?	Bioluminescence (luciferase), fluorescent proteins and NIR fluorophores are the most common.
How deep can light travel?	Bioluminescence and NIR windows (700–900 nm) reach several centimetres; visible fluorescence is limited to a few millimetres.
How many animals per session?	Typically 1–5 mice depending on stage size and workflow.
Is the technique non-invasive?	Yes — the same animal can be followed longitudinally for weeks.
What is the biggest source of error?	Inconsistent substrate dosing, exposure settings and ROI placement.

FAQ: Signals, Labels and Sensitivity

How deep in tissue can bioluminescence be detected?
Bioluminescent photons are produced inside the animal and escape with very low background, so signals from deep tissues such as lung, liver or bone marrow can usually be detected. Attenuation still makes the signal partly depth-dependent, which is why quantification guidance matters — see our article on quantifying in vivo bioluminescence signals.

Can I image both fluorescence and bioluminescence on the same system?
Yes. Most modern systems include both channels plus white-light photography for localisation. If your lab plans to move between luciferase tumour models and fluorescently labelled cells or probes, confirm at purchase time that filters, excitation sources and analysis software all support both modes.

How small a tumour or cell population can be detected?
For bioluminescent tumour models, detection thresholds in the low thousands of cells are routinely reported for subcutaneous sites; deep orthotopic sites are less sensitive. Fluorescence sensitivity depends strongly on autofluorescence at the chosen wavelength, which is why near-infrared dyes are preferred for in vivo work.

Does anaesthesia or fur affect the image?
Fur attenuates and scatters light; shaving or using nude/nude-like models improves signals. Isoflurane anaesthesia keeps animals still and stable and does not itself quench luciferase signal during a typical 1–5 minute exposure.

FAQ: Workflow, Throughput and Data

How long does a typical imaging session take?
For bioluminescence: substrate injection, a 10–15 minute wait for peak signal, then 1–5 minutes of acquisition per animal. A plate of five mice is commonly completed in under 30 minutes, which makes weekly longitudinal studies easy to schedule.

How do I keep data comparable across weeks?
Fix the exposure strategy (auto-exposure for screening, fixed exposure once you optimise), keep substrate dose and timing constant, and use identical regions of interest. Treat the raw “total flux” numbers cautiously and normalise as described in our quantification guide.

What training does a new user need?
A new PhD student or technician can typically run routine sessions after half a day of hands-on training. The deeper skills — probe selection, model design, statistical interpretation — come from the analysis literature and vendor support.

FAQ: Buying and Operating an In Vivo Imaging System

What does an in vivo imaging system cost?
Entry-level cooled-CCD bioluminescence/fluorescence systems start at a fraction of the price of multimodal PET/MRI platforms, which is exactly why optical imaging is the workhorse of longitudinal oncology and infection studies. Ask vendors to quote the complete package: camera, filters, anaesthesia, analysis software and installation.

How much maintenance is required?
Beyond keeping the imaging chamber clean and calibrating annually, maintenance is light. What matters more is vendor responsiveness — a system that is down during a time-course study loses weeks of data that no discount can recover.

Can one system serve several research groups?
Yes, and most shared-facility installations do. Look for user accounts, scheduled booking, and exportable raw data so each group can process results in its own analysis pipeline.

The SHANGTONG LumiFluor AVIS

The SHANGTONG LumiFluor AVIS is an advanced in vivo imaging system built around a deeply cooled scientific CCD, covering bioluminescence and multi-spectral fluorescence in one compact chamber. It is designed for longitudinal tumour monitoring, infection and cell-tracking studies in mouse and rat models, with straightforward software that new users learn in a single session. Explore the full Neuroscience Instruments line to see how imaging fits alongside tissue sectioning and analysis.

Where to Go Next

For applied reading, see how these workflows are used in oncology research, or browse the complete SHANGTONG Knowledge Library for sectioning, staining and analysis guides. Still have an unanswered question? Send it to our team — application scientists answer pre-purchase questions directly, without obligation.

This article is provided for informational purposes as part of the SHANGTONG Knowledge Library.