1/T2 and magnetic susceptibility measurements in a gerbil cardiac iron overload model

Zhiyue J. Wang, Lurong Lian, Qiukan Chen, Huaqing Zhao, Toshio Asakura, Alan R. Cohen

Research output: Contribution to journalArticle

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Abstract

PURPOSE: To measure the transverse relaxation rate (1/T2) and magnetic susceptibility of the heart in conditions of iron overload by using magnetic resonance (MR) imaging and to correlate these with the tissue iron concentration in a gerbil model. MATERIALS AND METHODS: With prior approval by the institutional animal care and use committee, iron overload was induced with one to 15 weekly subcutaneous injections of iron dextran. Nine gerbils had one to five injections, 10 had six to 10, and eight had 13-15. T2 of the whole heart was measured ex vivo (n = 27), and the magnetic susceptibility of the tissue was estimated through measurement of the tissue lysate (n = 25). The iron level was measured (in milligrams of iron per gram of wet tissue) with chemical analysis after MR imaging. While 1/T2 and magnetic susceptibility are not equivalent measures of the chemically determined tissue iron level, correlations were expected and were identified by using linear regression models. RESULTS: Iron concentration range was 0.28-1.95 mg/g wet tissue. Iron concentration was strongly correlated with 1/T2 (r = 0.92, P < .001, and the root of the mean squares error of the linear prediction, ∈RMS, was 0.17 mg Fe/g wet tissue with a repetition time of 700 msec). Iron concentration also was strongly correlated with magnetic susceptibility (r = 0.90, P < .001, ∈RMS = 0.19 mg Fe/g wet tissue). Multiple regression analysis with combined 1/T2 (with repetition time of 700 msec) and magnetic susceptibility data led to a slight increase in rand decrease in ∈RMS (r = 0.93, P < .001, ∈RMS = 0.16 mg Fe/g wet tissue). CONCLUSION: The results of this animal model study demonstrate that 1/T2 and magnetic susceptibility values can be used for estimation of the iron level in the heart.

Original languageEnglish (US)
Pages (from-to)749-755
Number of pages7
JournalRadiology
Volume234
Issue number3
DOIs
StatePublished - Mar 2005

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Iron Overload
Gerbillinae
Iron
Linear Models
Animal Care Committees
Magnetic Resonance Imaging
Subcutaneous Injections
Dextrans
Animal Models
Regression Analysis
Injections

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology

Cite this

1/T2 and magnetic susceptibility measurements in a gerbil cardiac iron overload model. / Wang, Zhiyue J.; Lian, Lurong; Chen, Qiukan; Zhao, Huaqing; Asakura, Toshio; Cohen, Alan R.

In: Radiology, Vol. 234, No. 3, 03.2005, p. 749-755.

Research output: Contribution to journalArticle

Wang, Zhiyue J. ; Lian, Lurong ; Chen, Qiukan ; Zhao, Huaqing ; Asakura, Toshio ; Cohen, Alan R. / 1/T2 and magnetic susceptibility measurements in a gerbil cardiac iron overload model. In: Radiology. 2005 ; Vol. 234, No. 3. pp. 749-755.
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abstract = "PURPOSE: To measure the transverse relaxation rate (1/T2) and magnetic susceptibility of the heart in conditions of iron overload by using magnetic resonance (MR) imaging and to correlate these with the tissue iron concentration in a gerbil model. MATERIALS AND METHODS: With prior approval by the institutional animal care and use committee, iron overload was induced with one to 15 weekly subcutaneous injections of iron dextran. Nine gerbils had one to five injections, 10 had six to 10, and eight had 13-15. T2 of the whole heart was measured ex vivo (n = 27), and the magnetic susceptibility of the tissue was estimated through measurement of the tissue lysate (n = 25). The iron level was measured (in milligrams of iron per gram of wet tissue) with chemical analysis after MR imaging. While 1/T2 and magnetic susceptibility are not equivalent measures of the chemically determined tissue iron level, correlations were expected and were identified by using linear regression models. RESULTS: Iron concentration range was 0.28-1.95 mg/g wet tissue. Iron concentration was strongly correlated with 1/T2 (r = 0.92, P < .001, and the root of the mean squares error of the linear prediction, ∈RMS, was 0.17 mg Fe/g wet tissue with a repetition time of 700 msec). Iron concentration also was strongly correlated with magnetic susceptibility (r = 0.90, P < .001, ∈RMS = 0.19 mg Fe/g wet tissue). Multiple regression analysis with combined 1/T2 (with repetition time of 700 msec) and magnetic susceptibility data led to a slight increase in rand decrease in ∈RMS (r = 0.93, P < .001, ∈RMS = 0.16 mg Fe/g wet tissue). CONCLUSION: The results of this animal model study demonstrate that 1/T2 and magnetic susceptibility values can be used for estimation of the iron level in the heart.",
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AU - Lian, Lurong

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AU - Asakura, Toshio

AU - Cohen, Alan R.

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N2 - PURPOSE: To measure the transverse relaxation rate (1/T2) and magnetic susceptibility of the heart in conditions of iron overload by using magnetic resonance (MR) imaging and to correlate these with the tissue iron concentration in a gerbil model. MATERIALS AND METHODS: With prior approval by the institutional animal care and use committee, iron overload was induced with one to 15 weekly subcutaneous injections of iron dextran. Nine gerbils had one to five injections, 10 had six to 10, and eight had 13-15. T2 of the whole heart was measured ex vivo (n = 27), and the magnetic susceptibility of the tissue was estimated through measurement of the tissue lysate (n = 25). The iron level was measured (in milligrams of iron per gram of wet tissue) with chemical analysis after MR imaging. While 1/T2 and magnetic susceptibility are not equivalent measures of the chemically determined tissue iron level, correlations were expected and were identified by using linear regression models. RESULTS: Iron concentration range was 0.28-1.95 mg/g wet tissue. Iron concentration was strongly correlated with 1/T2 (r = 0.92, P < .001, and the root of the mean squares error of the linear prediction, ∈RMS, was 0.17 mg Fe/g wet tissue with a repetition time of 700 msec). Iron concentration also was strongly correlated with magnetic susceptibility (r = 0.90, P < .001, ∈RMS = 0.19 mg Fe/g wet tissue). Multiple regression analysis with combined 1/T2 (with repetition time of 700 msec) and magnetic susceptibility data led to a slight increase in rand decrease in ∈RMS (r = 0.93, P < .001, ∈RMS = 0.16 mg Fe/g wet tissue). CONCLUSION: The results of this animal model study demonstrate that 1/T2 and magnetic susceptibility values can be used for estimation of the iron level in the heart.

AB - PURPOSE: To measure the transverse relaxation rate (1/T2) and magnetic susceptibility of the heart in conditions of iron overload by using magnetic resonance (MR) imaging and to correlate these with the tissue iron concentration in a gerbil model. MATERIALS AND METHODS: With prior approval by the institutional animal care and use committee, iron overload was induced with one to 15 weekly subcutaneous injections of iron dextran. Nine gerbils had one to five injections, 10 had six to 10, and eight had 13-15. T2 of the whole heart was measured ex vivo (n = 27), and the magnetic susceptibility of the tissue was estimated through measurement of the tissue lysate (n = 25). The iron level was measured (in milligrams of iron per gram of wet tissue) with chemical analysis after MR imaging. While 1/T2 and magnetic susceptibility are not equivalent measures of the chemically determined tissue iron level, correlations were expected and were identified by using linear regression models. RESULTS: Iron concentration range was 0.28-1.95 mg/g wet tissue. Iron concentration was strongly correlated with 1/T2 (r = 0.92, P < .001, and the root of the mean squares error of the linear prediction, ∈RMS, was 0.17 mg Fe/g wet tissue with a repetition time of 700 msec). Iron concentration also was strongly correlated with magnetic susceptibility (r = 0.90, P < .001, ∈RMS = 0.19 mg Fe/g wet tissue). Multiple regression analysis with combined 1/T2 (with repetition time of 700 msec) and magnetic susceptibility data led to a slight increase in rand decrease in ∈RMS (r = 0.93, P < .001, ∈RMS = 0.16 mg Fe/g wet tissue). CONCLUSION: The results of this animal model study demonstrate that 1/T2 and magnetic susceptibility values can be used for estimation of the iron level in the heart.

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