Radiological Physics and Technology

, Volume 11, Issue 2, pp 156–164 | Cite as

Quantitative T1 and T2* carotid atherosclerotic plaque imaging using a three-dimensional multi-echo phase-sensitive inversion recovery sequence: a feasibility study

  • Yasuhiro FujiwaraEmail author
  • Hirotoshi Maruyama
  • Kanako Toyomaru
  • Yuri Nishizaka
  • Masahiro Fukamatsu


Magnetic resonance imaging (MRI) is widely used to detect carotid atherosclerotic plaques. Although it is important to evaluate vulnerable carotid plaques containing lipids and intra-plaque hemorrhages (IPHs) using T1-weighted images, the image contrast changes depending on the imaging settings. Moreover, to distinguish between a thrombus and a hemorrhage, it is useful to evaluate the iron content of the plaque using both T1-weighted and T2*-weighted images. Therefore, a quantitative evaluation of carotid atherosclerotic plaques using T1 and T2* values may be necessary for the accurate evaluation of plaque components. The purpose of this study was to determine whether the multi-echo phase-sensitive inversion recovery (mPSIR) sequence can improve T1 contrast while simultaneously providing accurate T1 and T2* values of an IPH. T1 and T2* values measured using mPSIR were compared to values from conventional methods in phantom and in vivo studies. In the phantom study, the T1 and T2* values estimated using mPSIR were linearly correlated with those of conventional methods. In the in vivo study, mPSIR demonstrated higher T1 contrast between the IPH phantom and sternocleidomastoid muscle than the conventional method. Moreover, the T1 and T2* values of the blood vessel wall and sternocleidomastoid muscle estimated using mPSIR were correlated with values measured by conventional methods and with values reported previously. The mPSIR sequence improved T1 contrast while simultaneously providing accurate T1 and T2* values of the neck region. Although further study is required to evaluate the clinical utility, mPSIR may improve carotid atherosclerotic plaque detection and provide detailed information about plaque components.


Magnetic resonance imaging Plaque imaging Black-blood imaging Quantification Intra-plaque hemorrhage Quantitative MRI 


Compliance with ethical standards

Conflict of interest

This study was supported in part by a research grant from the Policy-Based Medical Services Foundation.

Statement of human rights

All procedures performed in studies involving human participants were conducted in accordance with the ethical standards of an institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments, or with comparable ethical standards.

Informed consent

Informed consent was obtained from each participant included in this study.


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Copyright information

© Japanese Society of Radiological Technology and Japan Society of Medical Physics 2018

Authors and Affiliations

  • Yasuhiro Fujiwara
    • 1
    Email author
  • Hirotoshi Maruyama
    • 2
  • Kanako Toyomaru
    • 3
  • Yuri Nishizaka
    • 3
  • Masahiro Fukamatsu
    • 4
  1. 1.Department of Medical Imaging, Faculty of Life SciencesKumamoto UniversityKumamotoJapan
  2. 2.Radiological CenterNational Hospital Organization Kumamoto Saisyunsou HospitalKumamotoJapan
  3. 3.Course of Radiological Science, School of Health SciencesKumamoto UniversityKumamotoJapan
  4. 4.Radiological CenterNational Hospital Organization Kumamoto Medical CenterKumamotoJapan

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