century, we now have many different ways of imaging the body providing complementary information, which is useful in diagnosis and treatment planning. This has been brought about by the application of new physics techniques for imaging, combined with the development of computers. Digital technology not only made these novel techniques practically feasible, but also gave the exciting possibility...

' 'One picture is worth more than a thousand words''. The validity of this expression, which is a leitmotiv in the publicity sector, is not limited to the strategy underlying advertisements. It certainly also applies to the commanding role images play in diagnostic medicine. To draw lines of development in imaging instruments, one must start where the arsenal of nuclear medicine equipment stand...