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To reconstruct the 3-dimensioanal image of heart and the region of myocardial ischemia from 2-dimensioanal tomogram of electron beam CT (EBCT).METHODS The left circumflex branch of coronary artery were occluded to form the ischemia in the left ventricular lateral wall in six dogs. A series of heart section were obtained by using tile enhanced volume scanning of EBCT. The ischemic myocardium was recognized in program in terms of area expanding method. Surface reconstruction was applied to constitute 3-dimensioanal... To reconstruct the 3-dimensioanal image of heart and the region of myocardial ischemia from 2-dimensioanal tomogram of electron beam CT (EBCT).METHODS The left circumflex branch of coronary artery were occluded to form the ischemia in the left ventricular lateral wall in six dogs. A series of heart section were obtained by using tile enhanced volume scanning of EBCT. The ischemic myocardium was recognized in program in terms of area expanding method. Surface reconstruction was applied to constitute 3-dimensioanal image of whole heart.RESULTS The reconstructed 3-dimensioanal image of heart was realistically displayed. The position and configuration of ischemic region was identified accurately and quantitatively.CONCLUSIONS The 3-dimensioanal reconstruction of myocardial ischemia can help physician to diagnose the focus of myocardial infarction more precisely than 2-dimensioanal image of EBCT. 研究电子束CT心肌梗死部位及形态的三维图象重建。结扎犬心冠状动脉左旋支及其分支,形成左室侧壁梗死区;经电子束CT增强容积扫描方式得到犬心断面,利用区域扩张法对梗死心肌进行自动分割;采用表面重建法完成犬心的三维重建。结果:清晰显示出了犬心的三维图象,并在三维图象上精确表示出了梗死的部位及形态。结论:在造影剂注射量与扫描起始时间适宜的条件下,利用电子束CT可完成能反映病变情况的心脏三维图象 URPOSE To reconstruct the threedimensional image of heart and the region of myocardial ischemia from twodimensional tomograph of electron beam CT (EBCT) and to assess the diagnostic accuracy of myocardial ischemia using EBCT.METHODS The left circumflex branch of coronary artery were occluded to form the ischemia in the left ventricular lateral wall in six dogs. The experimental dogs were put in suitable posture. A series of heart section were obtained by using the enhanced volume scanning method of EBCT... URPOSE To reconstruct the threedimensional image of heart and the region of myocardial ischemia from twodimensional tomograph of electron beam CT (EBCT) and to assess the diagnostic accuracy of myocardial ischemia using EBCT.METHODS The left circumflex branch of coronary artery were occluded to form the ischemia in the left ventricular lateral wall in six dogs. The experimental dogs were put in suitable posture. A series of heart section were obtained by using the enhanced volume scanning method of EBCT along longitudinal axis of heart. The ischemic myocardium was recognized in program in areagrow method. Surface reconstruction was applied to constitute threedimensional image of whole heart. Dogs pathological section were stained with Nitro-BT in order to calculate the macroscopic and staining, as well as CT diagnostic volume of myocardial ischemia.RESULTS ① The reconstructed threedimensional image of heart was realistically displayed. The position and configuration of ischemic region was identified accurately and quantitatively. ② The volume of myocardial ischemia through CT diagnosis was less than that through staining, but was more than that through macroscopic examination.CONCLUSIONS The threedimesional reconstruction of myocardial ischemia can help physician to diagnose the focus of myocardial infarction more precisely than twodimensional image of EBCT. The infarct regions include necrotic and traumatic regions. 目的用电子束CT重建心肌梗死部位及形态的三维图像,探讨电子束CT诊断心肌梗死的准确性。方法结扎犬心冠状动脉左旋支及其分支,形成左心室侧壁梗死区。用电子束CT增强容积扫描方式,沿犬心长轴扫描得到犬心断面。利用区域扩充法对梗死心脏的梗死部位进行自动分割。采用表面重建法完成梗死犬心的三维重建。用硝基四唑对犬心病理切片进行染色,并分别计算肉眼与染色,以及CT诊断所观察到的梗死部位的体积。结果①清晰显示出了犬心的三维图像,并在三维图像上精确表示出了梗死的部位及形态;②电子束CT诊断心肌梗死,其体积小于硝基四唑得到的结果,大于肉眼观察到的结果。结论电子束CT心脏三维图像能够帮助医生更加准确地诊断心肌梗死的部位与大小;其反映的梗死区域包含坏死区、损伤区两部分。 We reconstructed a 3 dimensioanal image of heart and the area of myocardial ischemia from 2 dimensioanal tomogram of electron beam CT (EBCT). The left circumflex branch of coronary artery were occluded to form ischemia of left ventricular lateral wall in six dogs. A series of heart section were obtained by using the enhanced volume scanning of EBCT. The ischemic myocardium was recognized in program in terms of area expanding method. Surface reconstruction was applied to constitute 3 dimensioanal image of... We reconstructed a 3 dimensioanal image of heart and the area of myocardial ischemia from 2 dimensioanal tomogram of electron beam CT (EBCT). The left circumflex branch of coronary artery were occluded to form ischemia of left ventricular lateral wall in six dogs. A series of heart section were obtained by using the enhanced volume scanning of EBCT. The ischemic myocardium was recognized in program in terms of area expanding method. Surface reconstruction was applied to constitute 3 dimensioanal image of whole heart. Pathological section was stained with Nitro BT. RESULTS:The reconstructed 3 dimensioanal image of heart was realistically displayed. The position and configuration of ischemic region was identified accurately and quantitatively. CONCLUSION:Position and volume of infarction can be diagnose by using EBCT. The 3 dimensioanal reconstruction of myocardial ischemia could help physician to diagnose the focus of myocardial infarction more precisely than 2 dimensioanal image of EBCT. 用电子束CT重建能表示梗塞部位及形态的心脏三维图象,通过结扎犬心冠状动脉左旋支及其分支,形成左室侧壁梗塞区,经电子束CT增强容积扫描方式得到犬心断面。利用区域扩充法对梗塞心肌进行自动分割,采用表面重建法完成犬心的三维重建,用硝基四唑对病理切片进行染色,结果:清晰显示出了犬心的三维图象,并在三维图象上精确表示出了梗塞的部位及形态。结论:在造影剂注射量与扫描起始时间适宜的条件下,利用电子束CT可以诊断梗塞的部位与大小,且能重建出反应病变情况的心脏三维图象
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