TU-FF-A2-04: Geometric Parameter Analysis to Predetermine Optimal Radiosurgery Technique for the Treatment of Arteriovenous Malformation

2005 ◽  
Vol 32 (6Part18) ◽  
pp. 2115-2115
Author(s):  
A Mestrovic ◽  
B Clark
Keyword(s):  
Arteriovenous Malformation ◽  
Geometric Parameter ◽  
Parameter Analysis

scholarly journals Variation of the Three-Dimensional Femoral J-Curve in the Native Knee

2021 ◽  
Vol 11 (7) ◽  
pp. 592
Author(s):  
Sonja A. G. A. Grothues ◽  
Klaus Radermacher
Keyword(s):  
Geometric Parameter ◽  
Knee Kinematics ◽  
Size Variation ◽  
Principal Component ◽  
Parameter Analysis ◽  
Patient Specific ◽  
3D Analysis ◽  
Relative Location ◽  
Shape Variation ◽  
J Curve

The native femoral J-Curve is known to be a relevant determinant of knee biomechanics. Similarly, after total knee arthroplasty, the J-Curve of the femoral implant component is reported to have a high impact on knee kinematics. The shape of the native femoral J-Curve has previously been analyzed in 2D, however, the knee motion is not planar. In this study, we investigated the J-Curve in 3D by principal component analysis (PCA) and the resulting mean shapes and modes by geometric parameter analysis. Surface models of 90 cadaveric femora were available, 56 male, 32 female and two without respective information. After the translation to a bone-specific coordinate system, relevant contours of the femoral condyles were derived using virtual rotating cutting planes. For each derived contour, an extremum search was performed. The extremum points were used to define the 3D J-Curve of each condyle. Afterwards a PCA and a geometric parameter analysis were performed on the medial and lateral 3D J-Curves. The normalized measures of the mean shapes and the aspects of shape variation of the male and female 3D J-Curves were found to be similar. When considering both female and male J-Curves in a combined analysis, the first mode of the PCA primarily consisted of changes in size, highlighting size differences between female and male femora. Apart from changes in size, variation regarding aspect ratio, arc lengths, orientation, circularity, as well as regarding relative location of the 3D J-Curves was found. The results of this study are in agreement with those of previous 2D analyses on shape and shape variation of the femoral J-Curves. The presented 3D analysis highlights new aspects of shape variability, e.g., regarding curvature and relative location in the transversal plane. Finally, the analysis presented may support the design of (patient-specific) femoral implant components for TKA.

scholarly journals Hemodynamic changes in superficial arteriovenous malformation surgery measured by intraoperative ICG fluorescence videoangiography with FLOW 800 software

2020 ◽  
Author(s):  
Xun Ye ◽  
Liang Wang ◽  
Ming-tao Li ◽  
Xiao-lin Chen ◽  
Hao Wang ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Hemodynamic Parameter ◽  
Maximum Intensity ◽  
Parameter Analysis ◽  
Hemodynamic Parameters ◽  
Hemodynamic Changes ◽  
Transit Times ◽  
Icg Angiography ◽  
Local Cycle ◽  
Flow 800

Abstract To analyze the application of intraoperative indocyanine green (ICG) angiography with FLOW 800 software in arteriovenous malformation (AVM) surgeries. Data on 17 patients undergoing surgery with ICG fluorescence were collected. To analyze the hemodynamic features of AVM and the influence on the peripheral cortex of AVM resection, we assessed the following hemodynamic parameters: maximum intensity, slope of rise, time to half-maximal fluorescence, and transit time from arteries to veins. In the 17 superficial AVMs studied, the time delay color mode of FLOW 800 software was superior to the traditional playback mode for identifying feeding arteries, draining veins, and their relation to normal cortical vessels.The maximum fluorescence intensity and slope of the ICG fluorescence curve of feeder arteries and draining veins were higher than those of normal peripheral vessels (P < 0.05). The transit times in AVMs were significantly shorter than those in normal peripheral vessels (P < 0.05).After AVM resection, cerebral flow increased in the cortex, and local cycle time become longer, although the differences were not significant (P > 0.05). Hemodynamic parameter analysis provided quality guidance for the resection of AVMs and could also be used in estimating changes in blood flow in the local cortex to identify abnormal hyperperfusion and residual nidus.

scholarly journals Hemodynamic changes in superficial arteriovenous malformation surgery measured by intraoperative ICG fluorescence videoangiography with FLOW 800 software

2020 ◽  
Author(s):  
Xun Ye ◽  
Liang Wang ◽  
Ming-tao Li ◽  
Xiao-lin Chen ◽  
Hao Wang ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Hemodynamic Parameter ◽  
Maximum Intensity ◽  
Parameter Analysis ◽  
Hemodynamic Parameters ◽  
Hemodynamic Changes ◽  
Transit Times ◽  
Local Cycle ◽  
Flow 800

Abstract Background: Arteriovenous malformation(AVM) have long-term “blood stealing” characteristics, which result in complicated hemodynamic features. To analyze the application of intraoperative indocyanine green angiography with FLOW 800 software in AVM surgeries.Methods: Data on 17 patients undergoing surgery with ICG fluorescence were collected. To analyze the hemodynamic features of AVM and the influence on the peripheral cortex of AVM resection, we assessed the following hemodynamic parameters: maximum intensity, slope of rise, time to half-maximal fluorescence, and transit time from arteries to veins.Results：In the 17 superficial AVMs studied, the time delay color mode of FLOW 800 software was superior to the traditional playback mode for identifying feeding arteries, draining veins, and their relation to normal cortical vessels.The maximum fluorescence intensity and slope of the ICG fluorescence curve of feeder arteries and draining veins were higher than those of normal peripheral vessels (P < 0.05). The transit times in AVMs were significantly shorter than those in normal peripheral vessels (P < 0.05).After AVM resection, cerebral flow increased in the cortex, and local cycle time become longer, although the differences were not significant (P > 0.05).Conclusions:Hemodynamic parameter analysis provided quality guidance for the resection of AVMs and could also be used in estimating changes in blood flow in the local cortex to identify abnormal hyperperfusion and residual nidus.

Abstract #494 Intense Headache in a 51-Year-Old Woman Referred as Complicated Arteriovenous Malformation

2019 ◽  
Vol 25 ◽  
pp. 243-244
Author(s):  
Jose Paz-Ibarra ◽  
Natalia Awramiszyn ◽  
Maria Trujillo
Keyword(s):  
Arteriovenous Malformation
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