Evaluation of MRI priority examination sequence for acute infection around the rectum and anus
Objective To analyze and summarize the superior sequences of MRI examination for acute infection around the rectum and anorectal canal,give priority to examination,and thus improve the success rate of examination.Methods The MRI manifestations of 75 patients with acute infection around the rectum and anorectal canal were retrospectively analyzed.The diagnostic rates of each sequence or sequence combination were compared with those of surgery.The priority sequences and sequence combinations that could complete the diagnosis were counted,and their diagnostic values were summarized.Results In 40 cases(53.3%),only one sequence of oblique axial fat-suppressed fast spin echo(FSE)T2WI was needed to complete the diagnosis.In 33 cases(40%),two sequences of oblique axial fat-suppressed FSE T2WI sequence and oblique axial non-fat-suppressed FSE T2WI sequence or oblique axial non-fat-suppressed FSE T1WI were needed to complete the diagnosis.In 1 case(1.3%),oblique axial fat-suppressed FSE T2WI sequence and oblique coronal fat-suppressed FSE T2WI sequence 3D reconstruction was needed to complete the diagnosis.In 1 case(1.3%),oblique axial fat-suppressed FSE T2WI sequence and oblique axial diffusion-weighted imaging sequence needed to complete the diagnosis.Conclusion The oblique axial fat-suppressed FSE T2WI sequence is the most basic sequence for acute infection around the rectum and anal canal.When the location of the lesion is unclear,it is necessary to add the oblique axial non-fat-suppressed FSE T2WI sequence or the oblique axial non-fat-suppressed FSE T1WI sequence,which can complete the diagnosis of most acute infections in a short time,with a total scanning time of 6-7 min.A small number of patients with complex fistula morphology need to scan the oblique coronal fat-suppressed FSE T2WI sequence and parallel 3D reconstruction.In individual cases where the internal opening is not clearly displayed,the diffusion-weighted imaging sequence can be tried.
万方数据
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