Editing Scanco User Instructions (section)

===CT Scan Settings===

*'''Resolution''': This setting includes the reconstruction matrix size (2048x2048, 1536x1536, 1024x1024, or 512x512) and the number of projections per 180°. The lower the resolution setting, the better the SNR and larger the voxel size.

*'''FOV / Diameter''': This field of view must fully contain the sample holder for accurate density measurements. Fixed FOV for XtremeCTs while having 5 options for each of microCTs: If you choose a smaller FOV than the sample holder, the scan may be aborted to prevent damage to the scanner. For the best resolution, you should choose the smallest holder that contains your sample.

*'''Voxel Size''': The nominal isotropic voxel size is determined by the FOV and the reconstruction matrix.

*'''Number of Slices''': You can specify a specific number of slices or image stacks to acquire (1x110 = 1 image stacks of 110 slices). The scan time increases with each image stack, therefore pay attention to the stack boundaries (e.g., 111 slices will take 2x longer to scan than 110 slices).

*'''Rel Position of First Slice''': This option enables you to offset the scan region from the reference line. This is useful for scanning a region a specific distance from the growth plate or centering the scan region around the reference line. If you disable the scout view, then the position is relative to the absolute 0 position of the scanner (top of the sample holder for the µCT35 and towards the back of the scanner for the vivaCT40).

*'''Integration Time''': The higher the integration time, the better the SNR and longer the scan time. Use 100 ms for patient scans and higher values for ex vivo scans of better image quality.  To get the highest integration time, uncheck the "Continuous ROT" button. For standard microCT measurements, use ~400 ms for the µCT35 and ~200 ms for the vivaCT40. The maximum integration time is scanner-specific and limited to prevent saturation of its detector.

*'''Average Data''': This is often referred to as frame averaging and is used to improve a scan's SNR. Multiply the average data value by the integration time to calculate the effective integration time. Only use this if the integration time is maxed out.

*'''Measurement Time''': This is the estimated scan time without the time performing the scout view or warm-up of the scanner.

*'''CTDIvol''': Computed Tomography Dose Index (CTDI) is a standardized measure of radiation dose output of a CT scanner for scanner settings' comparison purposes only, and it represents the average absorbed dose along the longitudinal axis from a series of contiguous CT exposures. Volumetric CTDI is the ratio of the weighted-CTDI to the level of overlap between slices (pitch). CTDIvol has no consideration of real scan length and does not represent actual dose administered to the patient.
:[[File:CTDI.JPG|600px]]

*'''DLP''': Dose Length Product DLP = CTDIvol *  Scan Length in unit of mGy-cm.


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====XtremeCT II Scan Settings====

:{| class="wikitable" style="text-align:center;" 
|-
! colspan="2"| Resolution Choice
! scope="col"| Native
! scope="col"| Custom
! scope="col"|   High  
! scope="col"| Medium
! scope="col"| Standard
|-
! colspan="2"| Image Matrix
| 4608
| 2304
| 1536
| 1024
| 512
|-
! colspan="2"| Projection/180°
| 3000
| 900
| 750
| 500
| 250
|-
! scope="row"| Voxel Size (µm)
! scope="row"| FOV/Diameter 140 mm
| 30.3
| 60.7
| 91.1
| 136.7
| 273.4
|-
! colspan="2"| Slices/Stack
| 338
| 168
| 112
| 74
| 37
|-
! colspan="2"| Stack Thickness (mm)
| 10.24
| 10.20
| 10.20
| 10.12
| 10.12
|-
! colspan="2"| Time/Stack (min, at 43 ms Integration Time)
| 8.1
| 2.0
| 2.0
| 1.4
| 0.7
|-
! colspan="2"| Time Current Product (mAs)
| 238
| 71
| 59
| 40
| 20
|-
! colspan="2"| CTDIvol (mGy)
| 37.4
| 11.2
| 9.3
| 6.4
| 3.2
|-
! colspan="2"| DLP (mGycm)
| 38.3
| 11.4
| 9.5
| 6.4
| 3.2
|}


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====XtremeCT I Scan Settings====

:{| class="wikitable" style="text-align:center;" 
|-
! colspan="2"| Resolution Choice
! scope="col"| Custom
! scope="col"| High
! scope="col"| Medium
! scope="col"| Standard
|-
! colspan="2"| Image Matrix
| 3072
| 1536
| 1024
| 512
|-
! colspan="2"| Projection/180°
| 1000
| 750
| 500
| 250
|-
! scope="row"| Voxel Size (µm)
! scope="row"| FOV/Diameter 126 mm
| 41
| 82
| 123
| 246
|-
! colspan="2"| Slices/Stack
| 221
| 110
| 73
| 36
|-
! colspan="2"| Stack Thickness (mm)
| 9.06
| 9.02
| 8.98
| 8.86
|-
! colspan="2"| Time/Stack (min, at 100 ms Integration Time)
| 3.7
| 2.8
| 1.9
| 1.0
|-
! colspan="2"| Time Current Product (mAs)
| 114
| 86
| 57
| 29
|-
! colspan="2"| CTDIvol (mGy)
| 7.3
| 5.5
| 3.6
| 1.9
|}


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====VivaCT80 Scan Settings====

:{| class="wikitable" style="text-align:center;" 
|-
! colspan="2"| Resolution Choice
! scope="col"| Native
! scope="col"| High
! scope="col"| Medium
! scope="col"| Standard
! scope="col"| Custom
|-
! colspan="2"| Image Matrix
| 3072
| 2048
| 1024
| 1024
| 512
|-
! colspan="2"| Projection/180°
| 1500
| 1000
| 500
| 250
| 125
|-
! rowspan="6"| Voxel Size (µm)
! scope="row"| FOV/Diameter 31.9 mm
| 10.4
| 15.6
| 31.9
| 31.2
| 62.4
|-
! scope="row"| FOV/Diameter 35.9 mm
| 11.6
| 17.5
| 35
| 35
| 70.1
|-
! scope="row"| FOV/Diameter 39.9 mm
| 13
| 19.5
| 39
| 39
| 78
|-
! scope="row"| FOV/Diameter 49.8 mm
| 16.1
| 24.2
| 48.5
| 48.5
| 97.1
|-
! scope="row"| FOV/Diameter 63.9 mm
| 20.8
| 31.2
| 62.4
| 62.4
| 124.8
|-
! scope="row"| FOV/Diameter 79.9 mm
| 26
| 39
| 78
| 78
| 156
|-
! colspan="2"| Slices/Stack
| 333 ~ 328
| 222 ~ 219
| 111 ~ 109
| 111 ~ 109
| 55 ~ 54
|-
! colspan="2"| Time/Stack (min, at 200 ms Integration Time)
| 14.9
| 10.0
| 5.0
| 2.5
| 1.3
|-
! colspan="2"| Time Current Product (mAs)
| 73
| 48
| 24
| 12
| 6
|}


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====VivaCT40 Scan Settings====

:{| class="wikitable" style="text-align:center;" 
|-
! colspan="2"| Resolution Choice
! scope="col"| High
! scope="col"| Medium
! scope="col"| Standard
! scope="col"| Custom
|-
! colspan="2"| Image Matrix
| 2048
| 1024
| 1024
| 512
|-
! colspan="2"| Projection/180°
| 1000
| 500
| 250
| 125
|-
! rowspan="5"| Voxel Size (µm)
! scope="row"| FOV/Diameter 21.5 mm
| 10.5
| 21
| 21
| 42
|-
! scope="row"| FOV/Diameter 25.6 mm
| 12.5
| 25
| 25
| 50
|-
! scope="row"| FOV/Diameter 30.7 mm
| 15
| 30
| 30
| 60
|-
! scope="row"| FOV/Diameter 35.8 mm
| 17.5
| 35
| 35
| 70
|-
! scope="row"| FOV/Diameter 38.9 mm
| 19
| 38
| 38
| 76
|-
! colspan="2"| Slices/Stack
| 213
| 106
| 106
| 53
|-
! colspan="2"| Time/Stack (min, at 200 ms Integration Time)
| 9.9
| 5.0
| 2.5
| 1.3
|-
! colspan="2"| Time Current Product (mAs)
| 61
| 31
| 15
| 8
|}


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====µCT35 Scan Settings====

:{| class="wikitable" style="text-align:center;" 
|-
! colspan="2"| Resolution Choice
! scope="col"| High
! scope="col"| Medium
! scope="col"| Standard
! scope="col"| Custom
|-
! colspan="2"| Image Matrix
| 2048
| 1024
| 1024
| 512
|-
! colspan="2"| Projection/180°
| 1000
| 500
| 250
| 125
|-
! rowspan="5"| Voxel Size (µm)
! scope="row"| FOV/Diameter 7.2 mm
| 3.5
| 7
| 7
| 14
|-
! scope="row"| FOV/Diameter 12.3 mm
| 6
| 12
| 12
| 24
|-
! scope="row"| FOV/Diameter 20.5 mm
| 10
| 20
| 20
| 40
|-
! scope="row"| FOV/Diameter 30.7 mm
| 15
| 30
| 30
| 60
|-
! scope="row"| FOV/Diameter 37.9 mm
| 18.5
| 37
| 37
| 74
|-
! colspan="2"| Slices/Stack
| 232 ~ 235
| 116 ~ 117
| 116 ~ 117
| 58
|-
! colspan="2"| Time/Stack (min, at 400 ms Integration Time)
| 23.9
| 12.3
| 6.5
| 3.5
|-
! colspan="2"| Time Current Product (mAs)
| 119
| 60
| 30
| 15
|}


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