Number of bins in TOF Projectors

[lukepolson]

I may have missed some stuff in the documentation, but I suspect the following may be valuable to specify:

• The argument tof_bins in joseph3d_fwd_tof_lm (and other corresponding functions) should be explicitly specified as Array[int] . In particular, it should be noted that only integer values can be specified here. .

The reason I say this is I was using float values for the tof_bins argument (namely ...-1.5,-0.5, 0.5, 1.5,...) as I was binning using an even number of bins, and so there was no "central" bin. In the C implementation, I see that that the tof_bins must have been converted to shorts. So I think an error should be thrown if the datatype of tof_bins is not integer.

[gschramm]

Hi Luke, thanks for spotting this! I fixed this in a commit for the upcoming v1.7 release here.

In LM you can use any number (even or odd) of TOF bins. The only important thing to remember is that the center of the bin labeled as "0" is in the center of the LOR by default. It can be shifted using the tofcenter_offset (which can be even LOR / event dependent) but that create some overhead ... (more array need to be copied ...)