Abstract
This study examined whether respiratory-controlled acquisition influences diffusion parameters obtained with intravoxel incoherent motion (IVIM) analysis using tri-exponential and bi-exponential models. Ten healthy volunteers were examined on a 3.0 T MRI system to obtain coronal diffusion-weighted images of both kidneys. The participants were scanned twice using respiratory-triggering (RT) and free-breathing (FB) acquisition to assess the repeatability of the measurements. We determined mean signal intensities in the renal cortex at each b value. Then, perfusion-related diffusion coefficient (Dp), fast-free diffusion coefficient (Df), slow-restricted diffusion coefficient (Ds), and their corresponding fractions (Fp, Ff, and Fs, respectively) were calculated using tri-exponential function. Moreover, perfusion-related diffusion coefficient (D*), the fraction (F), and perfusion-independent diffusion coefficient (D) were calculated using bi-exponential function. Normalized root-mean-square errors for the tri- and bi-exponential analyses (nRMSEtri and nRMSEbi, respectively) were determined to assess the deviation of the fitted to measured data, i.e., the fitting accuracy. Additionally, repeatability coefficients (RCs) were calculated from Bland–Altman plots to evaluate the repeatability of each diffusion parameter. These values were compared between the RT and FB groups. Dp and D* in the RT group were significantly lower than those in the FB group (P < 0.05). In addition, the RT group showed significantly lower nRMSEtri and nRMSEbi values than those in the FB group (P < 0.05). Moreover, Dp, Ds, Fs, and D* at RT showed lower RC values than those at FB. Respiratory-controlled acquisition affects perfusion-related diffusion parameters of the kidney obtained using tri-exponential and bi-exponential analyses.
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YM: conceptualization, data curation, formal analysis, investigation, methodology, validation, visualization, and writing—original draft. NO: conceptualization, data curation, formal analysis, investigation, methodology, software, validation, and writing—review & editing. TM: supervision and writing—review & editing. NH: supervision. YM: supervision. SK: supervision. TG: supervision.
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This study was presented as a digital poster at the International Society of Magnetic Resonance in Medicine (ISMRM) meeting on June 15–21, 2018, in Paris, France and published as Proc. of the Intl. Soc. Mag. Reson. Med. 26: 4595.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of Kanazawa University (No. 848–1).
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Informed consent was obtained from all individual participants included in the study. Participants also signed informed consent regarding publishing their data and photographs.
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Makino, Y., Ohno, N., Miyati, T. et al. Tri- and bi-exponential diffusion analyses of the kidney: effect of respiratory-controlled acquisition on diffusion parameters. Radiol Phys Technol 16, 478–487 (2023). https://doi.org/10.1007/s12194-023-00734-1
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DOI: https://doi.org/10.1007/s12194-023-00734-1