Measurement depth of planar surface coil and adjustment of excitation angle at the NMR measurement

Kuniyasu Ogawa, Tomoyuki Haishi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The measurement technique using a planar surface coil has advantages of acquiring a local Nuclear Magnetic Resonance (NMR) signal in short time from near the coil. The detection area of the coil depends on the inside diameter of the coil and the number of spin excitations. In this paper, the detection area and measurement depth of the coil in the case of measuring Free Induction decay (FID) signal and spin-echo signal were analyzed theoretically. In acquiring FID signal, the measurement depth of the coil is 0.38 time the inside diameter of the coil. On the other hand, in acquiring spin echo signal, the measurement depth decreases by 0.32 time the inside diameter of the coil. In order to verify the theoretical result, the surface coil with an inside diameter of 0.6 mm was used, and the ratio of the intensity of FID signal and spin-echo signal was compared. The theoretical result agrees with the experimental result. Furthermore, the method to adjust the excitation angle of magnetization vector on the surface of a sample to 90 degress is described in this paper.

Original languageEnglish
Pages (from-to)1862-1869
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume75
Issue number757
Publication statusPublished - 2009 Sep

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Magnetic resonance measurement
depth measurement
coils
adjusting
Nuclear magnetic resonance
nuclear magnetic resonance
excitation
Magnetization
echoes
induction
decay

Keywords

  • Excitation angle
  • Measurement depth
  • NMR measurement
  • Planar surface coil

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

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title = "Measurement depth of planar surface coil and adjustment of excitation angle at the NMR measurement",
abstract = "The measurement technique using a planar surface coil has advantages of acquiring a local Nuclear Magnetic Resonance (NMR) signal in short time from near the coil. The detection area of the coil depends on the inside diameter of the coil and the number of spin excitations. In this paper, the detection area and measurement depth of the coil in the case of measuring Free Induction decay (FID) signal and spin-echo signal were analyzed theoretically. In acquiring FID signal, the measurement depth of the coil is 0.38 time the inside diameter of the coil. On the other hand, in acquiring spin echo signal, the measurement depth decreases by 0.32 time the inside diameter of the coil. In order to verify the theoretical result, the surface coil with an inside diameter of 0.6 mm was used, and the ratio of the intensity of FID signal and spin-echo signal was compared. The theoretical result agrees with the experimental result. Furthermore, the method to adjust the excitation angle of magnetization vector on the surface of a sample to 90 degress is described in this paper.",
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AU - Ogawa, Kuniyasu

AU - Haishi, Tomoyuki

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N2 - The measurement technique using a planar surface coil has advantages of acquiring a local Nuclear Magnetic Resonance (NMR) signal in short time from near the coil. The detection area of the coil depends on the inside diameter of the coil and the number of spin excitations. In this paper, the detection area and measurement depth of the coil in the case of measuring Free Induction decay (FID) signal and spin-echo signal were analyzed theoretically. In acquiring FID signal, the measurement depth of the coil is 0.38 time the inside diameter of the coil. On the other hand, in acquiring spin echo signal, the measurement depth decreases by 0.32 time the inside diameter of the coil. In order to verify the theoretical result, the surface coil with an inside diameter of 0.6 mm was used, and the ratio of the intensity of FID signal and spin-echo signal was compared. The theoretical result agrees with the experimental result. Furthermore, the method to adjust the excitation angle of magnetization vector on the surface of a sample to 90 degress is described in this paper.

AB - The measurement technique using a planar surface coil has advantages of acquiring a local Nuclear Magnetic Resonance (NMR) signal in short time from near the coil. The detection area of the coil depends on the inside diameter of the coil and the number of spin excitations. In this paper, the detection area and measurement depth of the coil in the case of measuring Free Induction decay (FID) signal and spin-echo signal were analyzed theoretically. In acquiring FID signal, the measurement depth of the coil is 0.38 time the inside diameter of the coil. On the other hand, in acquiring spin echo signal, the measurement depth decreases by 0.32 time the inside diameter of the coil. In order to verify the theoretical result, the surface coil with an inside diameter of 0.6 mm was used, and the ratio of the intensity of FID signal and spin-echo signal was compared. The theoretical result agrees with the experimental result. Furthermore, the method to adjust the excitation angle of magnetization vector on the surface of a sample to 90 degress is described in this paper.

KW - Excitation angle

KW - Measurement depth

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KW - Planar surface coil

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