Evidence map›Paper›PMID 31304655›Full record

ArticleJournal of biophotonics2020

Real-time augmented reality for delineation of surgical margins during neurosurgery using autofluorescence lifetime contrast.

Alba Alfonso-Garcia, Julien Bec, Shamira Sridharan Weaver, Brad Hartl, Jakob Unger, Matthew Bobinski, Mirna Lechpammer, Fady Girgis, James Boggan, Laura Marcu

Abstract read
In one paragraph

Article in Journal of biophotonics, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers.

0numbers the graph read from it
0cells of the map it votes in
40citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

40 citing papers in PubMed.

  1. Article
  2. Impact of noise on optical redox ratio estimation.bioRxiv : the preprint server for biology · 2026
    Article
  3. Article
  4. Review
  5. Article
  6. Review
  7. Article
  8. Article
  9. Development of Time-Resolved Luminescence Measurement Instruments for Biosensing and Bioimaging - An Overview.Measurement : journal of the International Measurement Confederation · 2025
    Article
  10. Article
  11. Review
  12. Article
  13. Article
  14. Article
  15. Review
  16. Article
  17. Review
  18. Article
  19. A Tool-free Neuronavigation Method based on Single-view Hand Tracking.Computer methods in biomechanics and biomedical engineering. Imaging & visualization · 2023
    Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors.

Alba Alfonso-GarciaDepartment Biomedical Engineering, University of California, Davis, California.ORCID 0000-0002-6748-3751
Julien BecDepartment Biomedical Engineering, University of California, Davis, California.ORCID 0000-0003-1222-4071
Shamira Sridharan WeaverDepartment Biomedical Engineering, University of California, Davis, California.
Brad HartlDepartment Biomedical Engineering, University of California, Davis, California.ORCID 0000-0003-4252-4745
Jakob UngerDepartment Biomedical Engineering, University of California, Davis, California.
Matthew BobinskiDepartment Radiology, University of California, Davis, California.ORCID 0000-0002-8349-2084
Mirna LechpammerDepartment Pathology and Laboratory Medicine, University of California, Davis, California.ORCID 0000-0002-6235-6227
Fady GirgisDepartment Neurological Surgery, University of California, Davis, California.
James BogganDepartment Neurological Surgery, University of California, Davis, California.ORCID 0000-0002-1858-7183
Laura MarcuDepartment Biomedical Engineering, University of California, Davis, California.ORCID 0000-0003-2369-0748

Funding

Fluorescence Lifetime Imaging/Spectroscopy System For Robotic Cancer Surgery GuidanceR01CA187427 · NCI · UNIVERSITY OF CALIFORNIA AT DAVIS · PI BIRKELAND, ANDREW CHARLES, MARCU, LAURA · 2014 to 2025
$4.6M
Fluorescence lifetime technique for detection of radiation necrosis vs gliomR21CA178578 · NCI · UNIVERSITY OF CALIFORNIA AT DAVIS · PI MARCU, LAURA · 2014 to 2015
$360k
NCI NIH HHS R01 CA187427NCI NIH HHS R21 CA178578
6 · The paper itself

Abstract

Current clinical brain imaging techniques used for surgical planning of tumor resection lack intraoperative and real-time feedback; hence surgeons ultimately rely on subjective evaluation to identify tumor areas and margins. We report a fluorescence lifetime imaging (FLIm) instrument (excitation: 355 nm; emission spectral bands: 390/40 nm, 470/28 nm, 542/50 nm and 629/53 nm) that integrates with surgical microscopes to provide real-time intraoperative augmentation of the surgical field of view with fluorescent derived parameters encoding diagnostic information. We show the functionality and safety features of this instrument during neurosurgical procedures in patients undergoing craniotomy for the resection of brain tumors and/or tissue with radiation damage. We demonstrate in three case studies the ability of this instrument to resolve distinct tissue types and pathology including cortex, white matter, tumor and radiation-induced necrosis. In particular, two patients with effects of radiation-induced necrosis exhibited longer fluorescence lifetimes and increased optical redox ratio on the necrotic tissue with respect to non-affected cortex, and an oligodendroglioma resected from a third patient reported shorter fluorescence lifetime and a decrease in optical redox ratio than the surrounding white matter. These results encourage the use of FLIm as a label-free and non-invasive intraoperative tool for neurosurgical guidance.

Indexed as

Augmented RealityBrain NeoplasmsNeurosurgeryHumansMargins of ExcisionNeurosurgical Proceduresbrain tumorfluorescence lifetimeimagingneurosurgeryradiation-induced necrosis

Identifiers

PMID31304655
PMCPMC7510838

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.