Optimization Of Inversion Time for Postmortem Short-Tau Inversion Recovery (STIR) MR Imaging

Tomoya Kobayashi, Masahiko Monma, Takeshi Baba, Yoshiyuki Ishimori, Seiji Shiotani, Hajime Saitou, Kazunori Kaga, Katsumi Miyamoto, Hideyuki Hayakawa, Kazuhiro Homma

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Purpose: Signal intensity and image contrast differ between postmortem magnetic resonance (PMMR) images and images acquired from the living body. We sought to achieve sufficient fat suppression with short-tau inversion recovery (STIR) PMMR imaging by optimizing inversion time (TI). Material and Methods: We subjected 37 deceased adult patients to PMMR imaging at 1.5 tesla 8 to 60 hours after confirmation of death and measured T1 values of areas of subcutaneous fat with relaxation time maps. Rectal temperature (RT) measured immediately after PMMR ranged from 6 to 31°C. We used Pearson's correlation coefficient to analyze the relationship between T1 and relaxation time (RT). We compared STIR images from 4 cadavers acquired with a TI commonly used in the living body and another TI calculated from the linear regression of T1 and RT. Results: T1 values of subcutaneous fat ranged from 89.4 to 182.2 ms. There was a strong, positive, and significant correlation between T1 and RT (r = 0.91, P < 0.0001). The regression expression for the relationship was T1 = 2.6*RT + 90 at a field strength of 1.5T. The subcutaneous fat signal was suppressed more effectively with the optimized TI. Conclusion: The T1 value of subcutaneous fat in PMMR correlates linearly with body temperature. Using this correlation to determine TI, fat suppression with PMMR STIR imaging can be easily improved.

Original languageEnglish
Pages (from-to)67-72
Number of pages6
JournalMagnetic Resonance in Medical Sciences
Issue number2
Publication statusPublished - 2014
Externally publishedYes


  • Body temperature
  • Postmortem cross-sectional imaging
  • Postmortem magnetic resonance (PMMR) imaging
  • Short-tau inversion recovery (STIR)

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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