The use of SPAMM to assess spatial distortion due to static field inhomogeneity in dental MRI

R. R. Bridcut, Thomas William Redpath, Crawford F Gray, Roger T Staff

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In planning placement of dental implants using MRI, a SPAMM (spatial modulation of magnetization) magnetization preparation sequence was incorporated into a spin-echo imaging sequence. A phantom was imaged with a ferromagnetic object attached. Spatial distortion due to deviations in Larmor frequency was detected by a deviation of SPAMM lines. Both SPAMM line deviation and interline spacing were found to agree with a DeltaB(0) map generated from phase images. Imaging of a volunteer with and without typically used metallic implants positioned in a template showed SPAMM line deviations to correlate with expected deviations in vivo. SPAMM lines showed possible distortion due to chemical shift in the bone marrow and the presence of titanium implants to be insignificant. SPAMM may thus be used to provide a qualitative estimate of the accuracy of the MRI image when planning dental implants.

Original languageEnglish
Pages (from-to)1357-1367
Number of pages10
JournalPhysics in Medicine and Biology
Volume46
Issue number5
DOIs
Publication statusPublished - 2001

Keywords

  • ARTIFACTS

Cite this

The use of SPAMM to assess spatial distortion due to static field inhomogeneity in dental MRI. / Bridcut, R. R.; Redpath, Thomas William; Gray, Crawford F; Staff, Roger T.

In: Physics in Medicine and Biology, Vol. 46, No. 5, 2001, p. 1357-1367.

Research output: Contribution to journalArticle

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AB - In planning placement of dental implants using MRI, a SPAMM (spatial modulation of magnetization) magnetization preparation sequence was incorporated into a spin-echo imaging sequence. A phantom was imaged with a ferromagnetic object attached. Spatial distortion due to deviations in Larmor frequency was detected by a deviation of SPAMM lines. Both SPAMM line deviation and interline spacing were found to agree with a DeltaB(0) map generated from phase images. Imaging of a volunteer with and without typically used metallic implants positioned in a template showed SPAMM line deviations to correlate with expected deviations in vivo. SPAMM lines showed possible distortion due to chemical shift in the bone marrow and the presence of titanium implants to be insignificant. SPAMM may thus be used to provide a qualitative estimate of the accuracy of the MRI image when planning dental implants.

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