Brachial plexus MR imaging

Accuracy and reproducibility of DTI-derived measurements and fibre tractography at 3.0-T

Alberto Tagliafico, Massimo Calabrese, Matteo Puntoni, Daniele Pace, Gabriella Baio, Carlo Emanuele Neumaier, Carlo Martinoli

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Objective To estimate intrastudy, intraobserver and interobserver reproducibility of DTI-derived measurements and fibre tractography (FT) at 3.0 T MR imaging in subjects without known brachial plexus pathology. Methods IRB approval and written informed consent were obtained. Forty healthy volunteers underwent bilateral 3.0- T DTI of the brachial plexus. Postprocessing included FT and analysis of fractional anisotropy (FA) and apparent diffusion coefficient (ADC). Four authors performed post-processing and analysis independently and in different sessions at baseline and after 4 weeks. Non-parametric tests and Bland-Altman statistics were used. Results Minimum and maximum percent variability were 6% and 20% for FA (85%-93% reproducibility). For ADC minimum and maximum percent variability were 6% and 18% (86%-97% reproducibility). Quality of fibre tract was rated equal in 80% and slightly different in 20% of subjects. Minimum detectable differences between limb were 37% for FA and 32% for ADC. Intra- and inter-observer agreement were good. Evaluating the combined influence of the observer and of the repeated measurements the reproducibility was 81-92%. Conclusion DTI of brachial plexus nerves is reliable. The healthy contralateral side can be used as an internal control considering that changes in FA and ADC values of less that 37%and 32%will not be clinically detectable with confidence.

Original languageEnglish
Pages (from-to)1764-1771
Number of pages8
JournalEuropean Radiology
Volume21
Issue number8
DOIs
Publication statusPublished - Aug 2011

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Brachial Plexus
Anisotropy
Research Ethics Committees
Informed Consent
Healthy Volunteers
Extremities
Pathology

Keywords

  • Apparent diffusion coefficient
  • Brachial plexus
  • Diffusion tensor imaging
  • Fractional anisotropy
  • Minimum detectable differences
  • MRI
  • Repeatibility
  • Reproducibility

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Brachial plexus MR imaging : Accuracy and reproducibility of DTI-derived measurements and fibre tractography at 3.0-T. / Tagliafico, Alberto; Calabrese, Massimo; Puntoni, Matteo; Pace, Daniele; Baio, Gabriella; Neumaier, Carlo Emanuele; Martinoli, Carlo.

In: European Radiology, Vol. 21, No. 8, 08.2011, p. 1764-1771.

Research output: Contribution to journalArticle

Tagliafico, Alberto ; Calabrese, Massimo ; Puntoni, Matteo ; Pace, Daniele ; Baio, Gabriella ; Neumaier, Carlo Emanuele ; Martinoli, Carlo. / Brachial plexus MR imaging : Accuracy and reproducibility of DTI-derived measurements and fibre tractography at 3.0-T. In: European Radiology. 2011 ; Vol. 21, No. 8. pp. 1764-1771.
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abstract = "Objective To estimate intrastudy, intraobserver and interobserver reproducibility of DTI-derived measurements and fibre tractography (FT) at 3.0 T MR imaging in subjects without known brachial plexus pathology. Methods IRB approval and written informed consent were obtained. Forty healthy volunteers underwent bilateral 3.0- T DTI of the brachial plexus. Postprocessing included FT and analysis of fractional anisotropy (FA) and apparent diffusion coefficient (ADC). Four authors performed post-processing and analysis independently and in different sessions at baseline and after 4 weeks. Non-parametric tests and Bland-Altman statistics were used. Results Minimum and maximum percent variability were 6{\%} and 20{\%} for FA (85{\%}-93{\%} reproducibility). For ADC minimum and maximum percent variability were 6{\%} and 18{\%} (86{\%}-97{\%} reproducibility). Quality of fibre tract was rated equal in 80{\%} and slightly different in 20{\%} of subjects. Minimum detectable differences between limb were 37{\%} for FA and 32{\%} for ADC. Intra- and inter-observer agreement were good. Evaluating the combined influence of the observer and of the repeated measurements the reproducibility was 81-92{\%}. Conclusion DTI of brachial plexus nerves is reliable. The healthy contralateral side can be used as an internal control considering that changes in FA and ADC values of less that 37{\%}and 32{\%}will not be clinically detectable with confidence.",
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