2.2.2.5 Required image attributes for perfusion imaging ............................................ 223
2.2.2.6 Contrast injection considerations......................................................................223
2.2.2.7 Other considerations and references................................................................223
2.2.2.8 Recommended reading.................................................................................... 224
2.3 Total Scan Time................................................................................................................. 226
2.4 Automatic Exposure Control...............................................................................................227
2.4.1 How AEC works.........................................................................................................227
2.4.2 Adaptation to anatomy...............................................................................................227
2.4.3 When to use AEC...................................................................................................... 228
2.4.4 When not to use AEC................................................................................................ 228
2.4.5 AEC does not guarantee reduction of radiation doses in all patients........................ 228
2.4.6 Effect of AEC control setting......................................................................................228
2.4.7 AEC considerations of patient size, shape, composition, and age............................229
2.4.8 Dynamic AEC scanning.............................................................................................229
2.4.9 How to tell if the dose has changed...........................................................................229
2.4.10 Summary................................................................................................................. 229
2.4.11 AEC Messaging.......................................................................................................230
2.5 Slice Thickness Reference Noise Index and Noise Index Values...................................... 231
2.6 SmartmA/ODM................................................................................................................... 232
2.6.1 SmartmA....................................................................................................................232
2.6.1.1 SmartmA background....................................................................................... 232
2.6.1.2 SmartmA theory................................................................................................233
2.6.1.3 References....................................................................................................... 234
2.6.1.4 SmartmA FAQs.................................................................................................234
2.6.2 SmartmA....................................................................................................................239
2.6.3 Organ Dose Modulation (ODM).................................................................................239
2.7 kV Assist.............................................................................................................................241
2.7.1 kV Assist background................................................................................................ 241
2.7.2 kV Assist theory.........................................................................................................242
2.7.3 Image Display............................................................................................................243
2.7.4 kV Assist FAQs..........................................................................................................243
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
14 Table of Contents
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