Quantitative image-based phosphorus-31 MR spectroscopy for evaluating age-based differences in skeletal muscle metabolites

Shenweng Deng, Erika M. Ripley, Juan A. Vasquez, Devjit Tripathy, Ralph A Defronzo, Geoffrey D Clarke

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Purpose: To develop and validate a novel in-vivo phosphorus-31 magnetic resonance spectroscopy (31P-MRS) method to determine the absolute concentrations of phosphocreatine [PCr], inorganic phosphate [Pi], and adenosine triphosphate [ATP] in the vastus lateralis muscle. Materials and Methods: An external 6 mL plastic vial with 850 mM of methylenediphosphonic acid (MDP), fixed to the center of a commercial dual-tuned transmit/receive surface coil, was used to calibrate metabolite concentrations from spectral areas. A 15cm diameter, 4 L cylindrical phantom (35 mM H3PO4) was scanned on a custom coil holder using the same parameters. Reproducibility of the 31P-MRS measurements was determined in volunteers (2M/3F, age = 39.2±21.9 years) while accuracy was determined using phantoms of known concentrations. Eight young subjects (24.5+4.2 years; 4M/4F) and eight older subjects (59.6+4.5 years; 4M/4F) were scanned. Student's t-test was used to compare older versus younger subjects. Results: The percent error between the calculated and known molarity of phantoms was 3.3±1.9%. The mean coefficient of variation for the measurements of [PCr] was 5.2±3.7 %. Phosphorus metabolite concentrations, including [PCr] (25.2±3.4 mM vs. 28.5±3.4 mM, p < 0.005), [ATP] (6.68±0.84 mM vs. 7.71±0.61 mM, p<0.05) and [Pi] (3.18±0.46 mM vs. 2.56±0.55 mM, p<0.05) were significantly lower in older versus younger subjects. A significant, negative correlation was found between [PCr] and BMI (r = -0.50, p < 0.05). Conclusion: Quantitative 31P-MRS measurements reveal previously unappreciated differences in skeletal muscle phosphorus metabolite concentrations between young and older subjects and may provide unique insights when combined with other metabolic tests.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2018
Subtitle of host publicationPhysics of Medical Imaging
PublisherSPIE
Volume10573
ISBN (Electronic)9781510616356
DOIs
StatePublished - Jan 1 2018
EventMedical Imaging 2018: Physics of Medical Imaging - Houston, United States
Duration: Feb 12 2018Feb 15 2018

Other

OtherMedical Imaging 2018: Physics of Medical Imaging
CountryUnited States
CityHouston
Period2/12/182/15/18

Keywords

  • aging
  • magnetic resonance spectroscopy
  • phosphorus-31
  • skeletal muscle metabolism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Deng, S., Ripley, E. M., Vasquez, J. A., Tripathy, D., Defronzo, R. A., & Clarke, G. D. (2018). Quantitative image-based phosphorus-31 MR spectroscopy for evaluating age-based differences in skeletal muscle metabolites. In Medical Imaging 2018: Physics of Medical Imaging (Vol. 10573). [105732T] SPIE. https://doi.org/10.1117/12.2294627