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. 2023 Apr 17;109(5):1158–1168. doi: 10.1097/JS9.0000000000000369

Figure 2.

Figure 2

Schematic of steps to obtain the intersection of axial images, the union of the coronal computed tomography (CT) images and the union of the coronal CT images of the femoral neck. (A) The first slice axial CT image of femoral neck. (B) The second slice axial CT image of femoral neck. (C) Images overlaid, keeping the same scale and position. (D) The red overlapping part was the intersection of the images – axial safety target area (ASTA). (E) Building the coordinate system of ASTA. Taking the base AD of individualized ASTA as parallel line of the y-axis, drew a circumscribed rectangle ABCD, whose center O was the origin, and established a plane rectangular coordinate system YOZ. d1 and d2 were superior–inferior diameter (D-SI) and anterior–posterior diameter (D-AP) of ASTA under this coordinate system, respectively. (F–I) Schematic diagram of the steps to obtain the union of the coronal CT images of the femoral neck, superimposing coronal images in situ with keeping the same scale and position. (F) The first slice coronal CT image of femoral neck. (G) The second slice coronal CT image of femoral neck. (H) Images overlaid in situ, keeping the same scale and position. (I) The green part showed the union of the coronal images of femoral neck. The union of all the coronal images of femoral neck was equivalent to the projection of the femoral neck on its true coronal plane or meant simulated anteroposterior x-ray. (J–M) Schematic diagram of the steps to obtain the union of the sagittal CT images of the femoral neck, superimposing sagittal images in situ with keeping the same scale and position. (J) The first slice sagittal CT image of femoral neck. (K) The second slice sagittal CT image of femoral neck. (L) Images overlaid in situ, keeping the same scale and position. (M) The green part showed the union of the sagittal images of femoral neck. The union of all the sagittal images of femoral neck was equivalent to the projection of the femoral neck on its true sagittal plane or meant simulated lateral x-ray.