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Automatic Segmentation and Co-Registration of Gated CT Angiography Datasets: Measuring Abdominal Aortic Pulsatility

文献类型： 会议论文

第一作者： Robert Wentz

作者： Robert Wentz 1 ; Armando Manduca 2 ; JG Fletcher 3 ; Hassan Siddiki; Raymond C. Shields; Terri Vrtiska; Garrett Spencer; Andrew N. Primak; Jie Zhang; Theresa Nielson; Cynthia McCollough; Lifeng Yu;

作者机构： 1.Biomathematics Resource, Mayo Clinic College of Medicine 200 1st St. S.W., Rochester, MN, USA 55905

2.Dept. of Diagnostic Radiology, Mayo Clinic College of Medicine 200 1st St. S.W., Rochester, MN, USA 55905

3.Dept. of Cardiovascular Diseases Mayo Clinic Co

会议名称： Conference on Medical Imaging: Physiology, Function, and Structure from Medical Images

主办单位：

页码： 65111I.1-65111I.9

摘要： Purpose: To develop robust, novel segmentation and co-registration software to analyze temporally overlapping CT angiography datasets, with an aim to permit automated measurement of regional aortic pulsatility in patients with abdominal aortic aneurysms. Methods: We perform retrospective gated CT angiography in patients with abdominal aortic aneurysms. Multiple, temporally overlapping, time-resolved CT angiography datasets are reconstructed over the cardiac cycle, with aortic segmentation performed using a priori anatomic assumptions for the aorta and heart. Visual quality assessment is performed following automatic segmentation with manual editing. Following subsequent centerline generation, centerlines are cross-registered across phases, with internal validation of co-registration performed by examining registration at the regions of greatest diameter change (I.e. when the second derivative is maximal). Results: We have performed gated CT angiography in 60 patients. Automatic seed placement is successful in 79% of datasets, requiring either no editing (70%) or minimal editing (less than 1 minute; 12%). Causes of error include segmentation into adjacent, high-attenuating, non-vascular tissues; small segmentation errors associated with calcified plaque; and segmentation of non-renal, small paralumbar arteries. Internal validation of cross-registration demonstrates appropriate registration in our patient population. In general, we observed that aortic pulsatility can vary along the course of the abdominal aorta. Pulsation can also vary within an aneurysm as well as between aneurysms, but the clinical significance of these findings remain unknown. Conclusions: Visualization of large vessel pulsatility is possible using ECG-gated CT angiography, partial scan reconstruction, automatic segmentation, centerline generation, and co-registration of temporally resolved datasets.

分类号： R318.51

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