pet_method_requirements: Required Input Variables for PET Methods
Description
This function returns the required input variables for a given PET method,
or all methods if none is specified.
Usage
pet_method_requirements(x = NULL)
Value
A character vector of required input variables (if x is
provided), or a named list of all PET methods and their required inputs
(if x is NULL).
Arguments
x
Optional. A character string naming a PET method. If NULL (default),
the function returns a named list of all available methods and their required
input variables.