• Title/Summary/Keyword: Diffusion magnetic resonance

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Diffusion Tensor Imaging and Cerebrospinal Fluid Flow Study of Cine Phase Contrast in Normal Cervical Spinal Cords (정상인 경수에 대한 확산텐서영상과 PC기법을 이용한 뇌척수액 속도 측정에 관한 연구)

  • Son, B.K.;Kwak, S.Y.;Han, Y.H.;Yoo, J.S.;Kim, O.H.;Ko, H.Y.;Mun, C.W.
    • Investigative Magnetic Resonance Imaging
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    • v.17 no.2
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    • pp.123-132
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    • 2013

  • Purpose : We report the results of the various parameters of diffusion tensor imaging (DTI) and CSF flow study of the cervical spinal cord using magnetic resonance (MR) imaging techniques. Materials and Methods: Intramedullary FA and MD were measured in the gray matter and posterior cord of the white matter and both lateral cords of the white matter at the C2-3, C4-5, C5-6 spinal levels. For the CSF flow study, velocity encoding was obtained at the C2-3, C4-5, C5-6 spinal levels. Results: There was a significant difference of the FA and MD between the white matter and gray matter (p < 0.05). The FA of the gray matter was significantly different according to the cervical spinal cord levels (p < 0.05). Otherwise, the FA and MD parameters were not significantly different (p > 0.05). The mean peak systolic velocity and mean peak diastolic velocity were $5.18{\pm}2.00cm/sec$ and $-7.32{\pm}3.18cm/sec$, respectively from C2 to C6 spinal cords. There was no significant difference in these velocities among the cervical spinal cord (p > 0.05). Conclusion: This basic information about DTI and CSF dynamics of the cervical spinal cord may be useful for assessing cervical spinal cord abnormalities using MR imaging.

  • https://doi.org/10.13104/jksmrm.2013.17.2.123 인용 PDF KSCI

Changes in SNR and ADC According to the Increase in b Value in Liver Diffusion-Weighted Images

  • Cho, Jae-Hwan;Kim, Ham-Gyum
    • Journal of Magnetics
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    • v.17 no.3
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    • pp.219-224
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    • 2012

  • In the present study, changes in signal-to-noise ratio (SNR) and apparent diffusion coefficient (ADC) of the diffusion-weighted images in the normal livers were investigated using changes in b values in 1.5 T MR (magnetic resonance) instruments. Respective diffusion-weighted images and ADC map images were obtained from 20 healthy individuals by increasing b values from 50 to 400 and 800 $s/mm^2$ using 1.5T MR scanner between January 2011 and November 2011. At each ADC map image obtained at each b value, ADCs in the right hepatic lobe, spleen and kidney were measured. As a result, ADCs of the right hepatic lobe, spleen and kidney have gradually decreased in the diffusion-weighted images in accordance with the reduced b value. This outcome may be used as preliminary data for applications to various abdominal diseases.

  • https://doi.org/10.4283/JMAG.2012.17.3.219 인용 PDF KSCI