New duct caliber measurement methods on magnetic resonance cholangiopancreatography

R. Tamura, T. Ishibashi, H. Saito, K. Majima, M. Tsuda, S. Takahashi, S. Yamada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

PURPOSE: To report the feasibility of new duct caliber measurement methods using signal intensity on MR cholangiopancreatography (MRCP). MATERIALS AND METHODS: A phantom with 0.25-8 mm caliber ducts was imaged with a 1.5-Tesla MR system using the usual MRCP sequence. Each caliber was measured by conventional method (full width at half maximum, FWHM) and two new methods: the maximum intensity measurement method (MIM), in which caliber was calculated from maximum signal intensity, and the area intensity measurement method (AIM), in which caliber was calculated from the area under the signal intensity curve. Errors in calculated caliber were compared among the three methods of measurement. RESULTS: Mean measurement errors of each caliber for 1-8 mm ducts by MIM [14% (2.1-25%)] and by AIM [6.8% (0.4-16%)] were significantly lower than those by FWHM [30% (17-64%)]. AIM was significantly more accurate than MIM for caliber measurement of ducts over 1 mm. CONCLUSION: Two new caliber measurement methods for pancreatobiliary ducts in MRCP, MIM and AIM are accurate and should play an important role in clinical MRCP.

Original languageEnglish
Pages (from-to)738-745
Number of pages8
JournalNihon Igaku Hōshasen Gakkai zasshi. Nippon acta radiologica
Volume60
Issue number13
Publication statusPublished - 2000 Nov

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Oncology

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