The reproducibility of measurements using a standardization phantom for the evaluation of fractional anisotropy (FA) derived from diffusion tensor imaging (DTI)

Mitsuhiro Kimura, Hidetake Yabuuchi, Ryoji Matsumoto, Koji Kobayashi, Yasuo Yamashita, Kazuya Nagatomo, Ryoji Mikayama, Takeshi Kamitani, Koji Sagiyama, Yuzo Yamasaki

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Abstract

Objectives: It is necessary to standardize the examination procedure and diagnostic criteria of diffusion tensor imaging (DTI). Thus, the purpose of this study was to examine the reproducibility of measurements using a standardization phantom composed of different fibre materials with different fibre densities (FDs) for the evaluation of fractional anisotropy (FA) derived from DTI. Materials and methods: Two types of fibre materials wrapped in heat-shrinkable tubes were used as fibre phantoms. We designed fibre phantoms with three different FDs of each fibre material. The standardization phantom was examined using DTI protocol six times a day, and each examination session was repeated once a month for 7 consecutive months. Fibre tracking was performed by setting regions of interest in the FA map, and FA was measured in each fibre phantom. Coefficients of variation (CVs) were used to evaluate the inter-examination reproducibility of FA values. Furthermore, Bland–Altman plots were used to evaluate the intra-operator reproducibility of FA measurements. Results: All CVs for each fibre phantom were within 2% throughout the 7-month study of repeated DTI sessions. The high intra-operator reproducibility of the FA measurement was confirmed. Discussion: High reproducibility of measurements using a standardization phantom for the evaluation of FA was achieved.

Original languageEnglish
JournalMagnetic Resonance Materials in Physics, Biology and Medicine
DOIs
Publication statusAccepted/In press - Jan 1 2019

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Diffusion Tensor Imaging
Anisotropy
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

Cite this

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title = "The reproducibility of measurements using a standardization phantom for the evaluation of fractional anisotropy (FA) derived from diffusion tensor imaging (DTI)",
abstract = "Objectives: It is necessary to standardize the examination procedure and diagnostic criteria of diffusion tensor imaging (DTI). Thus, the purpose of this study was to examine the reproducibility of measurements using a standardization phantom composed of different fibre materials with different fibre densities (FDs) for the evaluation of fractional anisotropy (FA) derived from DTI. Materials and methods: Two types of fibre materials wrapped in heat-shrinkable tubes were used as fibre phantoms. We designed fibre phantoms with three different FDs of each fibre material. The standardization phantom was examined using DTI protocol six times a day, and each examination session was repeated once a month for 7 consecutive months. Fibre tracking was performed by setting regions of interest in the FA map, and FA was measured in each fibre phantom. Coefficients of variation (CVs) were used to evaluate the inter-examination reproducibility of FA values. Furthermore, Bland–Altman plots were used to evaluate the intra-operator reproducibility of FA measurements. Results: All CVs for each fibre phantom were within 2{\%} throughout the 7-month study of repeated DTI sessions. The high intra-operator reproducibility of the FA measurement was confirmed. Discussion: High reproducibility of measurements using a standardization phantom for the evaluation of FA was achieved.",
author = "Mitsuhiro Kimura and Hidetake Yabuuchi and Ryoji Matsumoto and Koji Kobayashi and Yasuo Yamashita and Kazuya Nagatomo and Ryoji Mikayama and Takeshi Kamitani and Koji Sagiyama and Yuzo Yamasaki",
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AU - Kimura, Mitsuhiro

AU - Yabuuchi, Hidetake

AU - Matsumoto, Ryoji

AU - Kobayashi, Koji

AU - Yamashita, Yasuo

AU - Nagatomo, Kazuya

AU - Mikayama, Ryoji

AU - Kamitani, Takeshi

AU - Sagiyama, Koji

AU - Yamasaki, Yuzo

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Objectives: It is necessary to standardize the examination procedure and diagnostic criteria of diffusion tensor imaging (DTI). Thus, the purpose of this study was to examine the reproducibility of measurements using a standardization phantom composed of different fibre materials with different fibre densities (FDs) for the evaluation of fractional anisotropy (FA) derived from DTI. Materials and methods: Two types of fibre materials wrapped in heat-shrinkable tubes were used as fibre phantoms. We designed fibre phantoms with three different FDs of each fibre material. The standardization phantom was examined using DTI protocol six times a day, and each examination session was repeated once a month for 7 consecutive months. Fibre tracking was performed by setting regions of interest in the FA map, and FA was measured in each fibre phantom. Coefficients of variation (CVs) were used to evaluate the inter-examination reproducibility of FA values. Furthermore, Bland–Altman plots were used to evaluate the intra-operator reproducibility of FA measurements. Results: All CVs for each fibre phantom were within 2% throughout the 7-month study of repeated DTI sessions. The high intra-operator reproducibility of the FA measurement was confirmed. Discussion: High reproducibility of measurements using a standardization phantom for the evaluation of FA was achieved.

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