评估慢性便秘的常用方法包括结肠传输试验、排粪造影和盆腔动态磁共振检查，用以鉴别慢传输型便秘和出口梗阻型便秘。这些检查方法具有微创、安全，技术上比较简单等特点，但由于受检者射线或检查设备的昂贵使其应用收到一定限制。动态肛管直肠超声成像技术和超声排粪成像技术（echodefecography）作为一项新近开展的诊断技术，能够对后盆底内所有功能异常状态进行有效评估，同时避免射线损伤。

Imaging evaluation and surgical treatment strategies of chronic constipation        Regadas FSP, Lima DMR, Murad-Regadas SM, et al.  Department of Surgery, Medical School, Federal University of Ceara, Fortaleza, Brazil
Abstract    The evaluation of chronic constipated patients is commonly based on colon transmission test, defecography (DF) and dynamic magnetic nuclear ressonance (MNR) of the pelvic floor to differentiate slow transmission from obstructed defecation. It is minimally invasive, safe and technically simple but has the disadvantage of exposing patients to radiation, or limited for a few centers due to the high cost. Dynamic anorectal ultrasonography (DAUS) and echodefecography are techniques which able to identify all dysfunctions of the posterior pelvic floor compartment without radiation.