Keeping track of threads

I am starting a thread in the usual way as follows:

Sub StartThread (ByVal CameraName as String)

Dim t As New Thread(AddressOf Frm1.GetPicture)
t.Name = "GetPicture" & CameraName
t.Start()

End Sub

This will be called at anytime and will be called many times. So I end up
with a number of threads running with the name of the order
GetPictureCamera1, GetPictureCamera2 etc.

Before starting the thread I have to be sure that the thread of the same
name isn't already running and this is where my problem is.

I can't do the usual threadstate because the reference t is only valid in
this routine whilst it starts.

I really want to be able to do:

Public t(n) As New Thread(AddressOf Frm1.GetPicture)

and then I could always have a global reference to t. But I can't do this.

So my question is, how do I keep track (other than a collection which
seems to often get out of step with reality) of all the threads in my
application?

I've tried System.Diagnostics and also Process.GetProcess but the only
reference I seem to have is the Name, which is not available in these
classes.

Thanks

-Jerry