So now we have to find the height? What shape is this? How do you find the height using two side lengths for a Right angled triangle? PYTHAGORAS THEOREM= EUREKA Once you find the height (c^2 = a^2 + b^2) This will give you the value for c. So what is the area of the face: Area of the Triangle = 1/2 X base x height In this situation we do not have the Height of the Triangle. Using this area we need to multiply with the length. We have to now think what is area for this shape. We gotta think what is the Volume of ANY 3D OBJECT? Volume = Area of repeated face X Length of the prism The repeated face for this triangular prism is the TRIANGLE. We just have the base length, the slant length (hypotenuse) and the length of the prism. In this triangular prism we don’t have the height. Plastic and Reconstructive Surgery, 72, 810-818.Finding the VOLUME of a triangular prism. Mastectomy reconstruction without a prosthetic implant. Plastic and Reconstructive Surgery, 110, 58-70. Clinical applications of three-dimensional photography in breast surgery. Galdino Grem, M., Maurice, N., Michael, C., Geng, J. International Journal of Computer Assisted Radiology and Surgery, 9, 541-549. Three-dimensional prediction of free-flap volume in autologous breast reconstruction by CT angiography imaging. Biomedizinische Technik, 53, 112-121.Įder, M., Raith, S., Jalali, J., Müller, D., Harder, Y., Dobritz, M., Papadopulos, N. Breast volume assessment based on 3D surface geometry: Verification of the method using MR imaging. Gland Surgery, 2, 212-226.Įder, M., Schneider, A., Feussner, H., Zimmermann, A., Höhnke, C., Papadopulos, N. Breast volumetric analysis for aesthetic planning in breast reconstruction: A literature review of techniques. These results suggest that the method using two symmetric triangular prisms could predict volume more easily than previously reported methods and may facilitate good breast reconstruction.Ĭhae, M. The methods presented appear useful to calculate flap volume closer to the measured value without complicated software systems. A sufficient flap volume was able to be transplanted in all cases. The ICC between predicted and actual values of triangular prisms using physical and CT measurements was largest: ICC (1, 2) = 0.978 (0.825-0.981 95% confidence interval for ICC). On Bland-Altman plots, values were distributed almost randomly around the average value of the difference, and no proportional error was evident in the methods. These three groups were compared using Bland-Altman plots and intraclass correlation coefficients (ICCs) to assess consistency between predicted and measured values. Flap volume was calculated using three methods of approximation: triangular prisms using physical and CT measurements (1/2xyz cm 3 ) quadrangular and triangular prisms using physical and CT measurements (3/4xyz cm 3 ) and a previously reported method using measurements from CT angiography alone and calculation with a standard mathematical formula. The weight and horizontal (x cm) and vertical (y cm) lengths of the DIEP flap were recorded, and the maximum thickness of subcutaneous tissue (z cm) was measured from computed tomography in 36 cases of breast reconstruction using DIEP flap in our hospital performed between January 2019 and December 2020. The accuracy of this method was evaluated based on both actual flap design and computed tomography. The purpose of this report was to present a simpler method for predicting the volume required for deep inferior epigastric artery perforator (DIEP) flaps. Many methods to predict the amount of tissue needed for breast reconstruction have been reported, but some require complicated software and special systems.
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