Siemens Medical Solutions gained FDA 510(k) market clearance for the SOMATOM Definition AS, said to be the first adaptive CT scanner, adapting to each patient’s clinical situation, available in 40-slice, 64-slice and 128-slice configurations.
The new system reportedly provides a benefit with the Adaptive Dose Shield technology, eliminating unnecessary over radiation. The Adaptive 4D Spiral mode of the SOMATOM Definition AS is able to address functional imaging (perfusion images of blood flow over time) of whole organs. This allows Siemens to offer dynamic information of up to 27 centimeters. In the case of a stroke, physicians can use whole-organ perfusion imaging not only for a small part of the brain but for all of it.
October 26, 2026 
