Editing Scanco User Instructions (section)

===X-ray Settings===
*'''Tube Energy (KVp)''': Fixed energy for XtremeCTs while having 3 options for each of microCTs: Use the 70 KVp for most samples, use the 55 or 45 KVp for low density objects (e.g., soft tissue) or specimens with a diameter less than 20 mm. Lower energies provide better contrast while higher energies provide better signal to noise (SNR).

*'''Tube Current (µA)''': Fixed current for XtremeCTs while having 2 options for each of energy settings of each microCTs: Use the higher current except when the voxel size is set for the best resolution of the scanner. The higher current will yield better SNR but a larger spot size.

:{| class="wikitable" style="text-align:center;" 
|-
! scope="col"| 
! scope="col"| XtremeCT II
! scope="col"| XtremeCT I
! colspan="3"| vivaCT80，vivaCT40， µCT35
|-
! scope="row"| E (KVp)
| 68 
| 60 
| 70  
| 55 
| 45 
|-
! scope="row"| I (µA)
| 1470 
| 900 
| 114, 57
| 145, 72 
| 177, 88  
|-
! scope="row"| Power (W)
| 100 
| 54 
|colspan="3"| 8, 4 
|}

*'''Filter''':  Fixed filter settings for all scanners except VivaCT 80 has 4 filter options.

*'''Calibration''': This sets the mu scaling factor, density and beam hardening correction used for the reconstruction. For standard patient scans use 200 mg HA/cm3.  For ex vivo bone scans, use 1200 mg HA/cm3, for soft tissue use the plexi scaling, and for non-biological tissues use the aluminum scaling. 


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