Figure 13From: 3D multimodal cardiac data reconstruction using angiography and computerized tomographic angiography registrationMask construction for CTA images. (a) Select CTA slice. (b) Extract region 1 based on Hounsfield Unit (HU) measurement. (c) Create the binary image by considering specific threshold. (d) Fill holes (for pulmonary vessels). (e) Construct mask. (f) Apply mask on regions 3 and 4 (HU ≥ 31).Back to article page