More input views mitigate the particle adhesion phenomenon when synthetic data is in the input (Figure ). However, more artifacts due to particle stacking with increasing views is observed with real XCT data (blue box in Figure ). The cone beam of the x-ray source and sample shifting during imaging can lead to this observed flaw when the input data is real radiograph. In Tomo-NeRF and the artificial generator, we assume parallel-beam geometry for the flux of photons with the X-ray point source at an infinite distance from the testing object. In a real experiment, the distance between the X-ray source and the object is limited, forming a cone beam at an angle of 3.28 degrees. The cone beam can distort the projection image away from the angle bisector of the cone. The higher energy for the photon flux near the angle bisector results in a brighter image (i.e., overexposure). In addition to cone-effect, slight misalignment during the experimental setup can result in part of the sample to be cut off in the field of view (orange box in Figure ). Particles obstructed or cut-off from the field of view will not emerge in reconstructed experimental data (orange box in Figure ).