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Fig. 1 | BMC Medical Imaging

Fig. 1

From: Revisiting left atrial volumetry by magnetic resonance imaging: the role of atrial shape and 3D angle between left ventricular and left atrial axis

Fig. 1

a Segmentation of left atrium (LA) in short axis (SAX) cine images at LA maximum volume. b LA (red) and left ventricle (LV, purple) shown in LV end-systolic phase according to the segmentation. 3D segmented LA maximum volume is 91.4 mL. Ascending aorta (Ao, green) is segmented roughly to aid in visualization. Displayed long axis plane is generated automatically by software from SAX images and represents roughly 2-chamber plane. c 3D coordinates for dorsal LA, middle of mitral ring, lateral right ventricle, and LV apex. d Illustration of 3D coordinates being used to define LA and LV long axes, and to calculate both LA long axis deviation angle from LV long axis (LA-LVangle) and LA long axis rotation angle in relation to 4CH plane (LArot_angle). Blue plane represents 4CH plane. A plane in which both LV and LA long axis lie is shown in red. e Data is later visualized in a polar graph where both LA axis deviation angle and LA axis rotation angle are shown simultaneously. Wireframe models of segmented LV (only wireframe), LA (red) and ascending aorta (green) are displayed in the background from LV apex perspective. 2CH two-chamber, 3CH three-chamber and 4CH four-chamber

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BMC Medical Imaging

ISSN: 1471-2342

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