Lexicon · NucLex for innovators
Multiscale model
Fully specified name: Multiscale model (concept)
A model connecting more than one spatial, temporal, or organizational scale.
- Scope note
- Connections between scales introduce assumptions to record and test.
- Synonyms
- None recorded as true synonyms in this context.
- Monograph
- Theranostic digital twins (planned; brief only)
- External mappings
- None recorded. In W0 no mapping to SNOMED CT® or any external authority is asserted for this entry. A future mapping record will carry source system, identifier, version, relation type, evidence, author, confidence where meaningful, and review state.
- Formal status
- Editorial entry only. It is not part of any released ontology and a prose edit here changes no formal definition.
Draft. This entry is an unreviewed draft. Its sources have not been checked by a named person and no domain reviewer has approved it. Treat every claim as provisional.
Notes
A multiscale model links descriptions of a system at different scales: spatial (molecule, cell, tissue, organ, whole body), temporal (seconds of binding, hours of distribution, days of decay, months of disease course), or organizational (pathway, cell population, patient, cohort). Radiopharmaceutical behavior spans all of these: binding at a receptor, uptake by a cell, accumulation in a tumor, clearance through the kidney, and radiation deposited over the lifetime of the radionuclide.
The difficulty is not any single scale but the joints between them. Passing from a molecular affinity to a tissue uptake rate, or from an organ activity curve to the dose at a cell, requires assumptions about averaging, homogeneity, and what is ignored. Those assumptions are the model's weakest and least visible part. Physicists, systems biologists, and pharmacometricians each have mature methods within their own scale.
An informatician's concern is that the bridging assumptions be written down: which quantity at one scale feeds which at the next, under what simplification, with what evidence. Formats such as the Systems Biology Markup Language (SBML) make model structure portable, but the justification for a cross-scale link still has to be stated by its author.
NucLex treats the multiscale model as part of the digital twin research direction. The ontology would name entities and parameters at each scale consistently so that the joints can be inspected. No multiscale model is implemented in the project.