Proton, diffusion-weighted imaging, and Sodium( 23Na) MRI of uterine leiomyomata after MR-guided high-intensity focused ultrasound: A preliminary study

Michael Jacobs, Ronald Ouwerkerk, Ihab R Kamel, Paul A Bottomley, David A. Bluemke, Hyun S. Kim

Research output: Contribution to journalArticle

Abstract

Purpose: To determine the feasibility of using combined proton( 1H), diffusion-weighted imaging(DWI), and sodium( 23Na) magnetic resonance imaging(MRI) to monitor the treatment of uterine leiomyomata(fibroids). Materials and Methods: Eight patients with uterine leiomyomata were enrolled and treated using MRI-guided high-intensity frequency ultrasound surgery(MRg-HIFUS). MRI scans collected at baseline and posttreatment consisted of T2-, T1-, and 1H DWI, as well as posttreatment 23Na MRI. The 23Na and 1H MRi were coregistered using a replacement phantom method. Regions of interest in treated and untreated uterine leiomyoma tissue were drawn on 1H MRI and DWI, wherein the tissue apparent diffusion coefficient of water(ADC) and absolute sodium concentrations were measured. Results: Regions of treated uterine tissue were clearly identified on both DWI and 23Na images. The sodium concentrations in normal myometrium tissue were 35.8 ± 2.1 mmol(mM), in the fundus; 43.4 ± 3.8 mM, and in the bladder; 65.3 ± 0.8 mM with ADC in normal myometrium of 2.2 ± 0.3 × 10 -3mm 2/sec. Sodium concentration in untreated leiomyomata were 28 ± 5 mM, and were significantly elevated(41.6 ± 7.6 mM, P <0.05) after treatment. Apparent diffusion coefficient values in the treated leiomyomata(1.30 ± 0.38 × 10 -3 mm 2/sec) were decreased compared to areas of untreated leiomyomata(1.75 ±-4048μ-4050μ36 × 10 -3 mm 2/sec; P = 0.04). Conclusion: Multiparametric imaging permits identification of uterine leiomyomata, revealing altered 23Na MRI and DWI levels following noninvasive treatment that provides a mechanism to explore the molecular and metabolic pathways after treatment.

Original languageEnglish (US)
Pages (from-to)649-656
Number of pages8
JournalJournal of Magnetic Resonance Imaging
Volume29
Issue number3
DOIs
Publication statusPublished - Mar 2009

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Keywords

  • ADC mapping
  • Diffusion weighted imaging(DWI)
  • High-intensity focused ultrasound
  • Magnetic resonance
  • MRg-HIFUS
  • Sodium(23NA) MRI
  • Uterine leiomyoma

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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