Asir-V Image Annotation; Acquire A Scan - GE Revolution CT User Manual

2.4 ASiR-V Image annotation

ASiR-V level and mode are annotated on the image using a character string that defines the
mode and level. It is displayed in the upper-left corner of the image next to the Recon Type.
The annotation logic is as follows:
•
AR - ASiR-V reconstruction
•
10 - 100, which is the percentage of the 100 % ASiR-V image that was blended with the
original to reduce the noise in the ASiR-V images.
For example, AR60 denotes ASiR-V reconstruction mode with 60% of the 100% ASiR-V was
blended with the original image.
NOTE: ASiR-V annotation information is not displayed in Advantage Workstation (AW)
applications on the operator console.

2.5 Acquire a scan

Use this procedure to acquire data where ASiR-V noise reduction reconstruction will be used.
ASiR-V is a reconstruction technique designed to reduce pixel-noise standard deviation in
clinical images while preserving the structure details in the image. The ASiR-V noise reduction
technique may let you reduce the X-ray dose, while maintaining acceptable image noise levels,
or it can be used to improve images with an unacceptable level of noise. ASiR-V is prescribed in
10 percent increments for 10 percent to 100 percent. ASiR-V mode is annotated AR xx.
Keep the following in mind when selecting an ASiR-V recon mode: ASiR-V is not compatible
with any of the real time interactive image modes such as SmartPrep.
Scan with ASiR-V
1. Prescribe the scan.
2. To enable ASiR-V and select an ASiR-V level in percentage open the Primary Recon
settings collection by clicking the Primary Recon title or icon. Click [ASiR-V].
3. Select the desired ASiR-V percentage level or use SmartmA.
If you want to use ASiR-V to maintain image quality but reduce dose, from the kV and mA
Control settings collection, reduce mA.
4. Start the scan.
Chapter 12 Scan Applications
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
311