If a PLES transmission phantom is used, how many images must be acquired to assess linearity over the entire field of view of a scintillation camera?

In nuclear medicine, when using a PLES (Pencil Beam) transmission phantom to assess the linearity of a scintillation camera, acquiring two images is essential. This process allows for a comprehensive evaluation of linearity across the entire field of view.

By capturing one image while the phantom is positioned in one orientation and another image after rotating or moving the phantom, it becomes possible to analyze how the scintillation camera responds to radiation across a range of angles and positions. This dual imaging approach ensures that linearity can be accurately determined, as it tests the camera's response to the transmitted photons from different areas of the phantom.

Acquiring only one image would not provide adequate data to evaluate the linearity effectively, as it would not cover the entire spatial response of the camera. Therefore, two images are necessary to achieve a complete assessment over the entire field of view.