And the optimum beam collimation is…

• …dependent on your scanner technology…

• …and what you are looking for…

• …and whether you can justify the dose needed to achieve an acceptable CNR

• Not more and preferably less than 3mm for good MPRs – basic reporting tool

• We currently use 2mm for our routine chest and body work, reconstructed every 1mm

• Since PIOPED 2 results, we use 1mms for CTPA

• We use 0.5mm for coronaries, C.O.W.