The filtered view shows the dose reduction compared to the reference value in normal weight patients. The reference value of the Federal Office for Radiation Protection is not to be confused with the legal limit, which is somewhat higher, but is only a guide to the average radiation exposure. The DLP-dose value represents the absolute radiation exposure, which was actually exposed to a patient. For better comparability with respect the relative radiation dose to the CDTI value addition is specified to 1 centimeter scan length.
For more information on dose analysis: http://www.doseintelligence.de