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Published in: Molecular Imaging and Biology 1/2022

01-02-2022 | Molecular Imaging | Brief Article

Examining the Feasibility of Quantifying Receptor Availability Using Cross-Modality Paired-Agent Imaging

Authors: Boyu Meng, Negar Sadeghipour, Margaret R. Folaron, Rendall R. Strawbridge, Kimberley S. Samkoe, Kenneth M. Tichauer, Scott C. Davis

Published in: Molecular Imaging and Biology | Issue 1/2022

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Abstract

Purpose

The ability to noninvasively quantify receptor availability (RA) in solid tumors is an aspirational goal of molecular imaging, often challenged by the influence of non-specific accumulation of the contrast agent. Paired-agent imaging (PAI) techniques aim to compensate for this effect by imaging the kinetics of a targeted agent and an untargeted isotype, often simultaneously, and comparing the kinetics of the two agents to estimate RA. This is usually accomplished using two spectrally distinct fluorescent agents, limiting the technique to superficial tissues and/or preclinical applications. Applying the approach in humans using conventional imaging modalities is generally infeasible since most modalities are unable to routinely image multiple agents simultaneously. We examine the ability of PAI to be implemented in a cross-modality paradigm, in which the targeted and untargeted agent kinetics are imaged with different modalities and used to recover receptor availability.

Procedures

Eighteen mice bearing orthotopic brain tumors were administered a solution containing three contrast agents: (1) a fluorescent agent targeted to epidermal growth factor receptor (EGFR), (2) an untargeted fluorescent isotype, and (3) a gadolinium-based contrast agent (GBCA) for MRI imaging. The kinetics of all three agents were imaged for 1 h after administration using an MRI-coupled fluorescence tomography system. Paired-agent receptor availability was computed using (1) the conventional all-optical approach using the targeted and untargeted optical agent images and (2) the cross-modality approach using the targeted optical and untargeted MRI-GBCA images. Receptor availability estimates between the two methods were compared.

Results

Receptor availability values using the cross-modality approach were highly correlated to the conventional, single-modality approach (r = 0.94; p < 0.00001).

Conclusion

These results suggest that cross-modality paired-agent imaging for quantifying receptor availability is feasible. Ultimately, cross-modality paired-agent imaging could facilitate rapid, noninvasive receptor availability quantification in humans using hybrid clinical imaging modalities.
Appendix
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Metadata
Title
Examining the Feasibility of Quantifying Receptor Availability Using Cross-Modality Paired-Agent Imaging
Authors
Boyu Meng
Negar Sadeghipour
Margaret R. Folaron
Rendall R. Strawbridge
Kimberley S. Samkoe
Kenneth M. Tichauer
Scott C. Davis
Publication date
01-02-2022
Publisher
Springer International Publishing
Published in
Molecular Imaging and Biology / Issue 1/2022
Print ISSN: 1536-1632
Electronic ISSN: 1860-2002
DOI
https://doi.org/10.1007/s11307-021-01629-6

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