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Barry J. Doyle, B. Eng, Anthony Callanan, B. Eng, Paul E

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Presentation on theme: "Barry J. Doyle, B. Eng, Anthony Callanan, B. Eng, Paul E"— Presentation transcript:

1 Vessel asymmetry as an additional diagnostic tool in the assessment of abdominal aortic aneurysms 
Barry J. Doyle, B.Eng, Anthony Callanan, B.Eng, Paul E. Burke, FRCS, Pierce A. Grace, FRCSI, Michael T. Walsh, PhD, David A. Vorp, PhD, Timothy M. McGloughlin, PhD  Journal of Vascular Surgery  Volume 49, Issue 2, Pages (February 2009) DOI: /j.jvs Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

2 Fig 1 Schematic of representative abdominal aortic aneurysm (AAA) shows how the dimensions are obtained from each AAA model. Surface area and volume both encompass the total surface area or volume of the AAA from immediately below the renal arteries to immediately before the iliac bifurcation. Dianorm is the infrarenal aortic diameter of the particular case. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

3 Fig 2 Left, Original asymmetric abdominal aortic aneurysm (AAA) of patient 2 and (right) the modified axisymmetric AAA. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

4 Fig 3 Simple illustration showing the method of obtaining asymmetry measurements. A, Three-dimensional abdominal aortic aneurysm (AAA) model and (B) line drawing. C, A centerline is automatically created through the polyline centroids. D, The endpoints of the centerline are connected with a straight line. E, and F, A perpendicular line is extended from this connecting line to predetermined points along the centerline. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

5 Fig 4 Computed tomography scans for patient 3 show the creation of polylines on each slice, together with the center point of each polyline. Once the polylines are created on each scan in the series, the slices are stacked to form the model on the right. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

6 Fig 5 Diagrams depict how measurements of asymmetry are determined once the abdominal aortic aneurysm (AAA) centerline is created. The example shown is for patient 3. Left, Endpoints of the centerline are connected. Middle, Perpendicular distances from the centerline are measured. Right, Asymmetry measurements along the length of the AAA are plotted. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

7 Fig 6 Relationships between (left column) posterior wall stress and anterior asymmetry and (right column) posterior wall stress and diameter for patients 1 through 5. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

8 Fig 7 Relationships between (left column) posterior wall stress and anterior asymmetry and (right column) posterior wall stress and diameter for patients 6 through 10. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

9 Fig 8 Relationships between (left column) posterior wall stress and anterior asymmetry and (right column) posterior wall stress and diameter for patients 11 through 15. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

10 Fig 9 Comparison of the posterior wall stress for the symmetric and asymmetric (circles) abdominal aortic aneurysm (AAA) for patient 2. Peak stress for this asymmetric AAA was located on the anterior-right wall. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2009 The Society for Vascular Surgery Terms and Conditions

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