d36_ball_phantom_calibration.py,some pictures

  Could you please provide some pictures for calibration？ What type of CT calibration ？


<img width="352" height="306" alt="Image" src="https://github.com/user-attachments/assets/f30dfff6-0aa2-48d9-8823-6d9804b2d490" />



How to calibrate using the geometric object in the image above？