The Full Width at Half Maximum (FWHM) formula includes which of the following elements?

The Full Width at Half Maximum (FWHM) is a critical parameter in imaging techniques like PET, as it quantifies the resolution of an imaging system. The FWHM specifically reflects how precisely the system can measure the energy of detected signals, which directly relates to the energy level calculation.

In the context of PET, energy resolution is essential because it allows for the distinction between various isotopes and signals detected during the imaging process. A smaller FWHM indicates a better resolution, meaning that the system can discern between different energy levels of gamma rays emitted from the radiopharmaceuticals used in PET scans. This resolution is pivotal for accurate imaging and diagnosis, highlighting the importance of energy level calculations in defining the FWHM value.

The other elements, while relevant in various contexts, do not directly pertain to the determination of FWHM in the context of PET imaging. The focus on energy level calculations illustrates the relationship between energy resolution, image clarity, and diagnostic accuracy in PET scans.