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Madhu B. Imaging and Spectroscopic-Based Methods to Understand Cancer Metabolism and Biology. Metabolites 2023; 13:940. [PMID: 37623883 PMCID: PMC10456931 DOI: 10.3390/metabo13080940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 08/11/2023] [Accepted: 08/11/2023] [Indexed: 08/26/2023] Open
Abstract
The results of publications in PubMed with the MeSH terms "cancer", "biology", "imaging and cancer", "metabolism" and "spectroscopy" are shown in Figure 1 in the form of a Venn diagram [...].
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Affiliation(s)
- Basetti Madhu
- Cancer Research UK Cambridge Institute, University of Cambridge, Robinson Way, Cambridge CB2 0RE, UK
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Sahin SI, Ji X, Agarwal S, Sinha A, Mali I, Gordon JW, Mattingly M, Subramaniam S, Kurhanewicz J, Larson PEZ, Sriram R. Metabolite-Specific Echo Planar Imaging for Preclinical Studies with Hyperpolarized 13C-Pyruvate MRI. Tomography 2023; 9:736-749. [PMID: 37104130 PMCID: PMC10143874 DOI: 10.3390/tomography9020059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 03/17/2023] [Accepted: 03/19/2023] [Indexed: 03/29/2023] Open
Abstract
Metabolite-specific echo-planar imaging (EPI) sequences with spectral–spatial (spsp) excitation are commonly used in clinical hyperpolarized [1-13C]pyruvate studies because of their speed, efficiency, and flexibility. In contrast, preclinical systems typically rely on slower spectroscopic methods, such as chemical shift imaging (CSI). In this study, a 2D spspEPI sequence was developed for use on a preclinical 3T Bruker system and tested on in vivo mice experiments with patient-derived xenograft renal cell carcinoma (RCC) or prostate cancer tissues implanted in the kidney or liver. Compared to spspEPI sequences, CSI were found to have a broader point spread function via simulations and exhibited signal bleeding between vasculature and tumors in vivo. Parameters for the spspEPI sequence were optimized using simulations and verified with in vivo data. The expected lactate SNR and pharmacokinetic modeling accuracy increased with lower pyruvate flip angles (less than 15°), intermediate lactate flip angles (25° to 40°), and temporal resolution of 3 s. Overall SNR was also higher with coarser spatial resolution (4 mm isotropic vs. 2 mm isotropic). Pharmacokinetic modelling used to fit kPL maps showed results consistent with the previous literature and across different sequences and tumor xenografts. This work describes and justifies the pulse design and parameter choices for preclinical spspEPI hyperpolarized 13C-pyruvate studies and shows superior image quality to CSI.
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Affiliation(s)
- Sule I. Sahin
- UC Berkeley—UCSF Graduate Program in Bioengineering, Berkeley, CA 94720, USA
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
| | - Xiao Ji
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
| | - Shubhangi Agarwal
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
| | - Avantika Sinha
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
| | - Ivina Mali
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
| | - Jeremy W. Gordon
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
| | | | - Sukumar Subramaniam
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
| | - John Kurhanewicz
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
| | - Peder E. Z. Larson
- UC Berkeley—UCSF Graduate Program in Bioengineering, Berkeley, CA 94720, USA
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
- Correspondence: (P.E.Z.L.); (R.S.)
| | - Renuka Sriram
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94016, USA
- Correspondence: (P.E.Z.L.); (R.S.)
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