[磁共振胰胆管造影术新的导管管径测量方法]

[New duct caliber measurement methods on magnetic resonance cholangiopancreatography].

作者信息

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

机构信息

Department of Radiology, Tohoku University, School of Medicine.

出版信息

Nihon Igaku Hoshasen Gakkai Zasshi. 2000 Nov;60(13):738-45.

PMID:11140322

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.

摘要

目的

报告利用磁共振胰胆管造影（MRCP）上的信号强度测量胆管管径新方法的可行性。

材料与方法

使用1.5特斯拉MR系统，采用常规MRCP序列对具有0.25 - 8毫米管径的体模进行成像。每种管径通过传统方法（半高宽，FWHM）以及两种新方法进行测量：最大强度测量法（MIM），即根据最大信号强度计算管径；面积强度测量法（AIM），即根据信号强度曲线下的面积计算管径。比较三种测量方法计算出的管径误差。