APPLICATION NOTE
2015-08-20
Measuring on
Hologic Selenia Dimensions 2D and 3D with
W/Cu beam quality
– with RaySafe Xi R/F calibrated before October 2014
BACKGROUND
In October 2013, Hologic introduced a new beam quality using W/Cu for their Selenia Dimensions 2D and 3D models. The application is called Contrast Enhancement and is used together with a normal mammography exposure in a two exposure sequence.
Since the 40 – 49 kV range is outside of the specification for the RaySafe Xi MAM detector, the RaySafe Xi R/F detector needs to be used for these measurements. Our tests have shown that all parameters except HVL will perform within specification when using the RaySafe Xi R/F detector. The HVL needs to be corrected for Xi R/F detectors calibrated before October 3, 2014. Other R/F detectors do not need a correction factor.
INSTRUCTIONS
To measure on the Hologic Selenia Dimensions 2D or 3D with W/Cu beam quality, use the RaySafe Xi R/F detector with R/F Low selected. For the HVL value, use a correction factor of 1.05 for R/F detectors calibrated before October 3, 2014.
Example: The measured HVL is 3.45 mm Al.
3.45 mm Al × 1.05 = 3.6225 mm Al
SPECIFICATION FOR THIS APPLICATION
Uncertainty dose (40 – 49 kV): 5%
Uncertainty kV (45 – 49 kV): 2%
Uncertainty HVL (45 – 49 kV): 5%
CONTACT
Please visit http://www.raysafe.com for more information.