Reply To: Virtual Finished CT Material Retention Samples Share ideas, questions and answers Search for: Home Page › Forums › Regulatory › Virtual Finished CT Material Retention Samples › Reply To: Virtual Finished CT Material Retention Samples Anonymous Reply To: Virtual Finished CT Material Retention Samples July 7, 2022 at 8:28 pm Is there a specific regulatory reference that interprets the use of photo retention samples for US and EU?