Skin temperature increase after whole body postmortem magnetic resonance imaging

Tomoya Kobayashi, Seiji Shiotani, Hiroyuki Muranaka, Hajime Saitou, Kazuya Tashiro, Satoka Someya, Masahiro Yoshida, Kazunori Kaga, Katsumi Miyamoto, Hideyuki Hayakawa, Kazuhiro Homma

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Purpose: To investigate causes for skin temperature increase after whole body postmortem magnetic resonance (PMMR) imaging. Material and methods: We performed PMMR imaging using a 1.5 T clinical scanner on 28 deceased human adults. The corpses were kept in cold storage at 4 ℃ before MRI and the scan room was maintained at 23 ℃. Skin temperatures of corpses before and after MRI were measured and average specific absorption rates (SAR) of the measured points were calculated. Results: Average skin temperature before and after PMMR imaging was 11.8 ± 5.8 ℃ and 15.0 ± 5.1 ℃, respectively. Average skin temperature increase was 3.2 ± 1.4 ℃, and whole-body average SAR in all sequences was 0.97 ± 0.94 W/kg. The skin temperature increase correlated significantly with the difference between the average initial skin temperature before PMMR imaging and the room temperature (R2 = 0.388, P = 0.002), but did not correlate significantly with whole-body average SAR in all sequences (R2 = 0.032, P = 0.662 > 0.05). Conclusion: The skin temperature increase during whole body PMMR imaging is more likely influenced by room temperature than by RF energy-induced heating effect. RF heating effect in PMMR imaging is minimal, and it appears to be no significant issue to conduct 1.5 T PMMR imaging prior to autopsy.

Original languageEnglish
Article number200405
JournalForensic Imaging
Volume23
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • MRI safety
  • postmortem magnetic resonance imaging
  • radiofrequency heating
  • risk management
  • skin temperature

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