Magnetic resonance imaging of anal canal using high-resolution sequences and phased array coil: visualization of perianal muscles

ZHANG Jianjun; MA Guojun; ZHAO Qiufeng; KONG Dewei; WANG Song

doi:10.19732/j.cnki.2096-6212.2018.06.007

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Magnetic resonance imaging of anal canal using high-resolution sequences and phased array coil: visualization of perianal muscles

更新时间：2025-12-15

- Magnetic resonance imaging of anal canal using high-resolution sequences and phased array coil: visualization of perianal muscles
- Vol. 27, Issue 6, Pages: 461-465(2018)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.19732/j.cnki.2096-6212.2018.06.007
  CLC：
- Published Online：16 January 2019，
  
  Published：16 January 2019
- 稿件说明：
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张建军,马国骏,赵秋枫,等. 正常成人肛周肌群的体外相控阵线圈高分辨率磁共振成像[J]. 肿瘤影像学, 2018, 27(6): 461-465 https://doi.

org/10.19732/j.cnki.2096-6212.2018.06.007
张建军,马国骏,赵秋枫,等. 正常成人肛周肌群的体外相控阵线圈高分辨率磁共振成像[J]. 肿瘤影像学, 2018, 27(6): 461-465 https://doi. DOI： 10.19732/j.cnki.2096-6212.2018.06.007.

org/10.19732/j.cnki.2096-6212.2018.06.007 DOI：

摘要

目的：

探讨体外相控阵线圈高分辨率磁共振成像（magnetic resonance imaging，MRI）对正常成人肛周肌群的显示及应用价值。

方法：

使用腹部体外相控阵线圈对38例正常成人［16例男性，22例女性，平均年龄为（56.319.7）岁］行肛周MRI。观察耻骨直肠肌与肛提肌及肛门外括约肌的关系、肛门外括约肌的分部及联合纵肌的构成。测量肛管、外括约肌及耻骨直肠肌长度，以及耻骨直肠肌和肛门内外括约肌厚度，并比较不同性别组之间的差异。

结果：

38例正常志愿者肛周MRI对耻骨直肠肌、肛提肌及肛门内外括约肌均能清晰地显示。耻骨直肠肌与其上方的肛提肌及下方的肛门外括约肌深部之间有脂肪间隙分隔，属于独立的结构。肛门外括约肌分为深部、浅部及皮下部3部分。肛门内外括约肌间的括约肌间隙内可见两层纵行的纤维。男性的外括约肌厚度为（4.10.7）mm，较女性的（3.40.6）mm厚（

=0.003）。男性与女性之间肛管、外括约肌、耻骨直肠肌长度，以及耻骨直肠肌和内外括约肌厚度差异无统计学意义（

＞0.05）。

结论：

体外相控阵线圈高分辨率MRI可清晰地显示肛周肌群及其周围间隙，为肛周疾病的诊断和治疗提供精确的解剖学信息。

Abstract

Objective:

To evaluate the normal anatomy of perianal muscles using high-resolution magnetic resonance imaging (MRI) with phased array coil.

Methods:

A total of 38 normal adults [16 males and 22 female

media age (56.319.7) years

]

underwent anal MRI with an abdominal phased array coil. The relationship among puborectalis muscle

levator ani muscle and external anal sphincter

fiber bundles of external anal sphincter and comp

onents of conjoint longitudinal muscle were analyzed. The length of anal canal

external anal sphincter and puborectalis muscle

the thickness of puborectalis muscle

external anal sphincter and internal anal sphincter were measured. The differences between males and females were compared.

Results:

Optimal image quality of puborectalis muscle

levator ani muscle

internal anal sphincter and external anal sphincter was obtained in all cases. Puborectalis muscle was an independent structure

with fat spaces separating among the superior levator ani muscle and inferior external anal sphincter. External anal sphincter had three separated muscular fiber bundles: deep

superficial and subcutaneous. Two longitudinal muscle layers were in the space between external anal sphincter and internal anal sphincter. The thickness of external anal sphincter in males [(4.10.7 mm)

]

was greater than that in females [(3.40.6) mm

]

(

=0.003). There was no significant difference in the length of anal canal

external anal sphincter and puborectalis muscle

and the thickness of puborectalis muscle

internal anal sphincter and external anal sphincter between males and females (

＞0.05).

Conclusion:

High-resolution mri with phased-array coil can display the anal canal and perianal structures in great detail

which will provide valuable information for the diagnosis and treatment of anal diseases.

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