A Comparative Study On MSCT And DSA Diagnosis Of Gastrointestinal Hemorrhage

Objective-To investigate the value of MSCT(multi-slices CT) and DSA diagnosed in intestinal hemorrhage by experiment and case analysis.Methods- A experimental model made by some swine intestinal tract were scanned after 30 second by MSCT after contrast medium in rate of flow 0.1ml/min, 0.2ml/min, 0.3ml/min, 0.4ml/min, 0.5ml/min, was injected respectively to the model. Before scanning the contrast medium was diluted to 3.0% as much as the blood contrast concentration when conventional enhanced scanning. A 16-detector row spiral CT scanner(GE Lightspeed 16CT 99OCO machine-type)was used to perform all scanning.Scanning parameters:tube tension 120kV, automatic tube current; pitch 1.375:1,matrix 512×512,slice thickness 10mm.Source images were reconstructed into images with slice-thickness of 0.625mm and were transported into a workstation(GE AW4.2)with which post-processing was conducted. Various image post-processing techniques such as MPR,MIP,VRT,etc. were applied .On the other hand, the undiluted contrast medium was injected to the model in the same rate of flow and imaging in DSA. A angiography machine(TOSHIBA-KXO-200A)was used to perform all image at the speed of 2 fps.The total time of image was 15 second.To investigate the vale of DSA and MSCT diagnosis of gastrointestinal hemorrhage,176 DSA cases and 57 MSCT cases were contrasting research.12 cases of these were imaginged both DSA and MSCT.Results-MSCT could display the contrast medium in the model when the injected rate of flow was 0.1ml/min, it could clear display when the injected flow rate was 0.2ml/min. when the rate of flow was over 0.2ml/min, it was more clear. DSA couldn't show the contrast medium when the rate of flow was 0.1ml/min, 0.2ml/min. It could displayed when 0.3ml/min, the images got clearer when 0.4ml/min and 0.5ml/min. 41 positive results were obtained in 176 DSA cases, the positive rate of DSA was 23.3%. These disorders included 14 cases of gastrointestinal inflammation(34.1%), 7 cases of vascular malformations (17.1%),9 cases of tumor (22.0%),5 cases of diverticulum(12.2%),6 cases of posttraumatic or postoperative(14.6%).23 positive results were obtained in 57 MSCT cases, the positive rate of MSCT was 40.3%. These disorders included 4 cases of gastrointestinal inflammation(17.4%), 3 cases of vascular malformations (13.0%),12 cases of tumor (52.1%),2 cases of diverticulum(8.7%),1 case of digestive ulcer (4.3%).1 case of intussusception (4.3%).Conclusion-MSCT could displayed the rate of bleeding flow over 0.1ml/min. DSA could display the bleeding of rate in 0.4ml/min. These results demonstrated MSCT was more sensitive than DSA in intestinal hemorrhage diagnosis,which was verifyied by analyse the clinical data.MSCT was not only more sensitive displaying the bleeding than DSA,but also display more information about the focus ,such as the shape of lesion,limbic tissue ,the density of lesion.MSCT was more convenient than DSA for gastrointestinal hemorrage as a routine examination.