Please help me translate the following Chinese into English：图像配准实验如图所示a组为脊柱模型医学图像配准实验b组为患者医学图像配准实验。图1所示为x光图像图2为生成的DRR图像图3为DRR图像与x光图像配准后的图像。

The image registration experiment is shown in the figure. Group A is the medical image registration experiment for the spinal model, and group B is the medical image registration experiment for the patient. Figure (1) shows the X-ray image, figure (2) shows the generated DRR image, and figure (3) shows the image after the DRR image is registered with the X-ray image.