Equivalence of arterial and venous blood for [11C]CO2-metabolite analysis following intravenous administration of 1-[11C]acetate and 1-[11C]palmitate

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Abstract

Purpose: Sampling of arterial blood for metabolite correction is often required to define a true radiotracer input function in quantitative modeling of PET data. However, arterial puncture for blood sampling is often undesirable. To establish whether venous blood could substitute for arterial blood in metabolite analysis for quantitative PET studies with 1-[11C]acetate and 1-[11C]palmitate, we compared the results of [11C]CO2-metabolite analyses performed on simultaneously collected arterial and venous blood samples. Methods: Paired arterial and venous blood samples were drawn from anesthetized pigs at 1, 3, 6, 8, 10, 15, 20, 25 and 30min after i.v. administration of 1-[11C]acetate and 1-[11C]palmitate. Blood radioactivity present as [11C]CO2 was determined employing a validated 10-min gas-purge method. Briefly, total blood 11C radioactivity was counted in base-treated [11C]-blood samples, and non-[11C]CO2 radioactivity was counted after the [11C]-blood was acidified using 6N HCl and bubbled with air for 10min to quantitatively remove [11C]CO2. Results: An excellent correlation was found between concurrent arterial and venous [11C]CO2 levels. For the [11C]acetate study, the regression equation derived to estimate the venous [11C]CO2 from the arterial values was: y=0.994x+0.004 (r2=0.97), and for the [11C]palmitate: y=0.964x-0.001 (r2=0.9). Over the 1-30min period, the fraction of total blood 11C present as [11C]CO2 rose from 4% to 64% for acetate, and 0% to 24% for palmitate. The rate of [11C]CO2 appearance in venous blood appears similar for the pig model and humans following i.v. [11C]-acetate administration. Conclusion: Venous blood [11C]CO2 values appear suitable as substitutes for arterial blood samples in [11C]CO2 metabolite analysis after administration of [11C]acetate or [11C]palmitate. Advances in Knowledge and Implications for Patient Care: Quantitative PET studies employing 1-[11C]acetate and 1-[11C]palmitate can employ venous blood samples for metabolite correction of an image-derived tracer arterial input function, thereby avoiding the risks of direct arterial blood sampling.

Original languageEnglish
Pages (from-to)361-365
Number of pages5
JournalNuclear Medicine and Biology
Volume40
Issue number3
DOIs
StatePublished - Apr 2013

Fingerprint

Palmitates
Intravenous Administration
Radioactivity
Blood Substitutes
carbon-11 acetate
Swine
Punctures
Patient Care
Acetates

Keywords

  • CO
  • Acetate
  • Arterial
  • Metabolite
  • Palmitate
  • Venous

ASJC Scopus subject areas

  • Cancer Research
  • Molecular Medicine
  • Radiology Nuclear Medicine and imaging

Cite this

@article{f804fcfad79e4dca9afe6a6c18baac5f,
title = "Equivalence of arterial and venous blood for [11C]CO2-metabolite analysis following intravenous administration of 1-[11C]acetate and 1-[11C]palmitate",
abstract = "Purpose: Sampling of arterial blood for metabolite correction is often required to define a true radiotracer input function in quantitative modeling of PET data. However, arterial puncture for blood sampling is often undesirable. To establish whether venous blood could substitute for arterial blood in metabolite analysis for quantitative PET studies with 1-[11C]acetate and 1-[11C]palmitate, we compared the results of [11C]CO2-metabolite analyses performed on simultaneously collected arterial and venous blood samples. Methods: Paired arterial and venous blood samples were drawn from anesthetized pigs at 1, 3, 6, 8, 10, 15, 20, 25 and 30min after i.v. administration of 1-[11C]acetate and 1-[11C]palmitate. Blood radioactivity present as [11C]CO2 was determined employing a validated 10-min gas-purge method. Briefly, total blood 11C radioactivity was counted in base-treated [11C]-blood samples, and non-[11C]CO2 radioactivity was counted after the [11C]-blood was acidified using 6N HCl and bubbled with air for 10min to quantitatively remove [11C]CO2. Results: An excellent correlation was found between concurrent arterial and venous [11C]CO2 levels. For the [11C]acetate study, the regression equation derived to estimate the venous [11C]CO2 from the arterial values was: y=0.994x+0.004 (r2=0.97), and for the [11C]palmitate: y=0.964x-0.001 (r2=0.9). Over the 1-30min period, the fraction of total blood 11C present as [11C]CO2 rose from 4{\%} to 64{\%} for acetate, and 0{\%} to 24{\%} for palmitate. The rate of [11C]CO2 appearance in venous blood appears similar for the pig model and humans following i.v. [11C]-acetate administration. Conclusion: Venous blood [11C]CO2 values appear suitable as substitutes for arterial blood samples in [11C]CO2 metabolite analysis after administration of [11C]acetate or [11C]palmitate. Advances in Knowledge and Implications for Patient Care: Quantitative PET studies employing 1-[11C]acetate and 1-[11C]palmitate can employ venous blood samples for metabolite correction of an image-derived tracer arterial input function, thereby avoiding the risks of direct arterial blood sampling.",
keywords = "CO, Acetate, Arterial, Metabolite, Palmitate, Venous",
author = "Yen Ng and Moberly, {Steven P.} and Mather, {Kieren J.} and Clive Brown-Proctor and Hutchins, {Gary D.} and Green, {Mark A.}",
year = "2013",
month = "4",
doi = "10.1016/j.nucmedbio.2012.11.011",
language = "English",
volume = "40",
pages = "361--365",
journal = "Nuclear Medicine and Biology",
issn = "0969-8051",
publisher = "Elsevier Inc.",
number = "3",

}

TY - JOUR

T1 - Equivalence of arterial and venous blood for [11C]CO2-metabolite analysis following intravenous administration of 1-[11C]acetate and 1-[11C]palmitate

AU - Ng, Yen

AU - Moberly, Steven P.

AU - Mather, Kieren J.

AU - Brown-Proctor, Clive

AU - Hutchins, Gary D.

AU - Green, Mark A.

PY - 2013/4

Y1 - 2013/4

N2 - Purpose: Sampling of arterial blood for metabolite correction is often required to define a true radiotracer input function in quantitative modeling of PET data. However, arterial puncture for blood sampling is often undesirable. To establish whether venous blood could substitute for arterial blood in metabolite analysis for quantitative PET studies with 1-[11C]acetate and 1-[11C]palmitate, we compared the results of [11C]CO2-metabolite analyses performed on simultaneously collected arterial and venous blood samples. Methods: Paired arterial and venous blood samples were drawn from anesthetized pigs at 1, 3, 6, 8, 10, 15, 20, 25 and 30min after i.v. administration of 1-[11C]acetate and 1-[11C]palmitate. Blood radioactivity present as [11C]CO2 was determined employing a validated 10-min gas-purge method. Briefly, total blood 11C radioactivity was counted in base-treated [11C]-blood samples, and non-[11C]CO2 radioactivity was counted after the [11C]-blood was acidified using 6N HCl and bubbled with air for 10min to quantitatively remove [11C]CO2. Results: An excellent correlation was found between concurrent arterial and venous [11C]CO2 levels. For the [11C]acetate study, the regression equation derived to estimate the venous [11C]CO2 from the arterial values was: y=0.994x+0.004 (r2=0.97), and for the [11C]palmitate: y=0.964x-0.001 (r2=0.9). Over the 1-30min period, the fraction of total blood 11C present as [11C]CO2 rose from 4% to 64% for acetate, and 0% to 24% for palmitate. The rate of [11C]CO2 appearance in venous blood appears similar for the pig model and humans following i.v. [11C]-acetate administration. Conclusion: Venous blood [11C]CO2 values appear suitable as substitutes for arterial blood samples in [11C]CO2 metabolite analysis after administration of [11C]acetate or [11C]palmitate. Advances in Knowledge and Implications for Patient Care: Quantitative PET studies employing 1-[11C]acetate and 1-[11C]palmitate can employ venous blood samples for metabolite correction of an image-derived tracer arterial input function, thereby avoiding the risks of direct arterial blood sampling.

AB - Purpose: Sampling of arterial blood for metabolite correction is often required to define a true radiotracer input function in quantitative modeling of PET data. However, arterial puncture for blood sampling is often undesirable. To establish whether venous blood could substitute for arterial blood in metabolite analysis for quantitative PET studies with 1-[11C]acetate and 1-[11C]palmitate, we compared the results of [11C]CO2-metabolite analyses performed on simultaneously collected arterial and venous blood samples. Methods: Paired arterial and venous blood samples were drawn from anesthetized pigs at 1, 3, 6, 8, 10, 15, 20, 25 and 30min after i.v. administration of 1-[11C]acetate and 1-[11C]palmitate. Blood radioactivity present as [11C]CO2 was determined employing a validated 10-min gas-purge method. Briefly, total blood 11C radioactivity was counted in base-treated [11C]-blood samples, and non-[11C]CO2 radioactivity was counted after the [11C]-blood was acidified using 6N HCl and bubbled with air for 10min to quantitatively remove [11C]CO2. Results: An excellent correlation was found between concurrent arterial and venous [11C]CO2 levels. For the [11C]acetate study, the regression equation derived to estimate the venous [11C]CO2 from the arterial values was: y=0.994x+0.004 (r2=0.97), and for the [11C]palmitate: y=0.964x-0.001 (r2=0.9). Over the 1-30min period, the fraction of total blood 11C present as [11C]CO2 rose from 4% to 64% for acetate, and 0% to 24% for palmitate. The rate of [11C]CO2 appearance in venous blood appears similar for the pig model and humans following i.v. [11C]-acetate administration. Conclusion: Venous blood [11C]CO2 values appear suitable as substitutes for arterial blood samples in [11C]CO2 metabolite analysis after administration of [11C]acetate or [11C]palmitate. Advances in Knowledge and Implications for Patient Care: Quantitative PET studies employing 1-[11C]acetate and 1-[11C]palmitate can employ venous blood samples for metabolite correction of an image-derived tracer arterial input function, thereby avoiding the risks of direct arterial blood sampling.

KW - CO

KW - Acetate

KW - Arterial

KW - Metabolite

KW - Palmitate

KW - Venous

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U2 - 10.1016/j.nucmedbio.2012.11.011

DO - 10.1016/j.nucmedbio.2012.11.011

M3 - Article

C2 - 23306135

AN - SCOPUS:84875262164

VL - 40

SP - 361

EP - 365

JO - Nuclear Medicine and Biology

JF - Nuclear Medicine and Biology

SN - 0969-8051

IS - 3

ER -