Diffusion tensor imaging of kidneys with respiratory triggering

Optimization of parameters to demonstrate anisotropic structures on fraction anisotropy maps

Masako Kataoka, Aki Kido, Akira Yamamoto, Yuji Nakamoto, Takashi Koyama, Hiroyoshi Isoda, Yoji Maetani, Shigeaki Umeoka, Ken Tamai, Tsuneo Saga, Nobuko Morisawa, Susumu Mori, Kaori Togashi

Research output: Contribution to journalArticle

Abstract

Purpose: To demonstrate the feasibility of diffusion tensor imaging(DTI) of kidneys with respiratory triggering, and determine the optimal imaging parameters for fraction an-isotropy(FA) maps. Materials and Methods: DTI of kidneys from 16 healthy volunteers was performed using a 1.5T scanner. Five different sequences with different parameters including respiration-triggered acquisition or multiple breath-holding, slice thicknesses of 3 or 5 mm, and different numbers of signal averaging and b values were compared. FA and apparent diffusion coefficients(ADCs) of the cortex and medulla were measured. Measurement error within the same and repeated examination was examined using within-individual standard deviation(Sw). Results: FAs of the renal cortex were lower than the medulla(mean value of a sequence ranging 0.148-0.224, 0.433-0.476) and the ADCs of the cortex were higher than the medulla(2.26-2.69 X 10̃ 3 mm 2/s, 1.77-2.19 X 10̃ 3 mm 2/s) in all sequences(P <0.001). The renal cortex- medulla difference was the largest, with respiratorytrigger-ing including a 3-mm slice thickness, three signal averages,and a b-value = 0, 200, or 400 s/mm 2(P <0.001). Sw tended to be smaller in the sequence with a b-value of 400 s/mm 2. Conclusion: DTI of kidneys with respiratory triggering is feasible with excellent cortex-medulla differentiation.

Original languageEnglish (US)
Pages (from-to)736-744
Number of pages9
JournalJournal of Magnetic Resonance Imaging
Volume29
Issue number3
DOIs
StatePublished - Mar 2009

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Diffusion Tensor Imaging
Anisotropy
Kidney
Breath Holding
Healthy Volunteers
Respiration

Keywords

  • Apparent diffusion coefficient
  • DTI
  • Fractional anisotropy
  • Kidney
  • Respiratory triggering

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Diffusion tensor imaging of kidneys with respiratory triggering : Optimization of parameters to demonstrate anisotropic structures on fraction anisotropy maps. / Kataoka, Masako; Kido, Aki; Yamamoto, Akira; Nakamoto, Yuji; Koyama, Takashi; Isoda, Hiroyoshi; Maetani, Yoji; Umeoka, Shigeaki; Tamai, Ken; Saga, Tsuneo; Morisawa, Nobuko; Mori, Susumu; Togashi, Kaori.

In: Journal of Magnetic Resonance Imaging, Vol. 29, No. 3, 03.2009, p. 736-744.

Research output: Contribution to journalArticle

Kataoka, M, Kido, A, Yamamoto, A, Nakamoto, Y, Koyama, T, Isoda, H, Maetani, Y, Umeoka, S, Tamai, K, Saga, T, Morisawa, N, Mori, S & Togashi, K 2009, 'Diffusion tensor imaging of kidneys with respiratory triggering: Optimization of parameters to demonstrate anisotropic structures on fraction anisotropy maps', Journal of Magnetic Resonance Imaging, vol. 29, no. 3, pp. 736-744. https://doi.org/10.1002/jmri.21669
Kataoka, Masako ; Kido, Aki ; Yamamoto, Akira ; Nakamoto, Yuji ; Koyama, Takashi ; Isoda, Hiroyoshi ; Maetani, Yoji ; Umeoka, Shigeaki ; Tamai, Ken ; Saga, Tsuneo ; Morisawa, Nobuko ; Mori, Susumu ; Togashi, Kaori. / Diffusion tensor imaging of kidneys with respiratory triggering : Optimization of parameters to demonstrate anisotropic structures on fraction anisotropy maps. In: Journal of Magnetic Resonance Imaging. 2009 ; Vol. 29, No. 3. pp. 736-744.
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AU - Kataoka, Masako

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AU - Nakamoto, Yuji

AU - Koyama, Takashi

AU - Isoda, Hiroyoshi

AU - Maetani, Yoji

AU - Umeoka, Shigeaki

AU - Tamai, Ken

AU - Saga, Tsuneo

AU - Morisawa, Nobuko

AU - Mori, Susumu

AU - Togashi, Kaori

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N2 - Purpose: To demonstrate the feasibility of diffusion tensor imaging(DTI) of kidneys with respiratory triggering, and determine the optimal imaging parameters for fraction an-isotropy(FA) maps. Materials and Methods: DTI of kidneys from 16 healthy volunteers was performed using a 1.5T scanner. Five different sequences with different parameters including respiration-triggered acquisition or multiple breath-holding, slice thicknesses of 3 or 5 mm, and different numbers of signal averaging and b values were compared. FA and apparent diffusion coefficients(ADCs) of the cortex and medulla were measured. Measurement error within the same and repeated examination was examined using within-individual standard deviation(Sw). Results: FAs of the renal cortex were lower than the medulla(mean value of a sequence ranging 0.148-0.224, 0.433-0.476) and the ADCs of the cortex were higher than the medulla(2.26-2.69 X 10̃ 3 mm 2/s, 1.77-2.19 X 10̃ 3 mm 2/s) in all sequences(P <0.001). The renal cortex- medulla difference was the largest, with respiratorytrigger-ing including a 3-mm slice thickness, three signal averages,and a b-value = 0, 200, or 400 s/mm 2(P <0.001). Sw tended to be smaller in the sequence with a b-value of 400 s/mm 2. Conclusion: DTI of kidneys with respiratory triggering is feasible with excellent cortex-medulla differentiation.

AB - Purpose: To demonstrate the feasibility of diffusion tensor imaging(DTI) of kidneys with respiratory triggering, and determine the optimal imaging parameters for fraction an-isotropy(FA) maps. Materials and Methods: DTI of kidneys from 16 healthy volunteers was performed using a 1.5T scanner. Five different sequences with different parameters including respiration-triggered acquisition or multiple breath-holding, slice thicknesses of 3 or 5 mm, and different numbers of signal averaging and b values were compared. FA and apparent diffusion coefficients(ADCs) of the cortex and medulla were measured. Measurement error within the same and repeated examination was examined using within-individual standard deviation(Sw). Results: FAs of the renal cortex were lower than the medulla(mean value of a sequence ranging 0.148-0.224, 0.433-0.476) and the ADCs of the cortex were higher than the medulla(2.26-2.69 X 10̃ 3 mm 2/s, 1.77-2.19 X 10̃ 3 mm 2/s) in all sequences(P <0.001). The renal cortex- medulla difference was the largest, with respiratorytrigger-ing including a 3-mm slice thickness, three signal averages,and a b-value = 0, 200, or 400 s/mm 2(P <0.001). Sw tended to be smaller in the sequence with a b-value of 400 s/mm 2. Conclusion: DTI of kidneys with respiratory triggering is feasible with excellent cortex-medulla differentiation.

KW - Apparent diffusion coefficient

KW - DTI

KW - Fractional anisotropy

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KW - Respiratory triggering

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