Uterine peristalsis shown on cine MR imaging using ultrafast sequence

Asako Nakai, Kaori Togashi, T. Yamaoka, Toshitaka Fujiwara, Hiroyuki Ueda, Takashi Koyama, Hisataka Kobayashi, Tatsuo Kagimura, Shingo Fujii, Junji Konishi
In: Journal of Magnetic Resonance Imaging · 2003 · vol. 18(6) , pp. 726–733 · doi:10.1002/jmri.10415 · PMID:14635158 · W2163439827
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Ultrafast cine MRI demonstrated uterine peristalsis in 30 of 59 studies, with wave direction correlating to menstrual cycle phases and frequency of 1.2-2.3 contractions per minute.

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Abstract

PURPOSE: To demonstrate and evaluate uterine peristalsis on cine magnetic resonance imaging (MRI) using ultrafast imaging. MATERIALS AND METHODS: Serial MR uterine images (300) were obtained from 15 normal volunteers over four menstrual phases using true fast imaging with steady-state precession (true FISP) technique over 117 seconds and videotaped. Three radiologists independently evaluated videotapes of 59 studies. Uterine peristalsis was defined as wavy movements of subendometrial myometrium or endometrium. Interobserver reliability was evaluated using a Kappa coefficient. Fifty-four studies obtained in appropriate phases were analyzed. RESULTS: Cine MRI displayed uterine peristalsis in 30 of 59 studies; consensus reading showed direction in 23 studies. Reliability between the final consensus of the recognition of uterine peristalsis and those of the three readers was extremely concordant, with a Kappa coefficient of 0.908. Wave direction was cervico-fundal in follicular and periovulatory phases, with frequency of contraction waves being 1.2-2.3 per minute in positive studies. CONCLUSION: Uterine peristalsis was demonstrated on cine MR using ultrafast MRI. Direction and frequency of peristaltic waves are closely related to menstrual cycle phases. Supplementary material for this article can be found on the JMRI website at http://www.interscience.wiley.com/jpages/1053-1807/suppmat/index.html.

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