Vatech Smart Plus PHT-35LHS, Техническое руководство

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Smart Plus (PHT-35LHS)
Technical Manual
VT-TECH-Smart Plus-001
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.
ALL RIGHTS RESERVED
8. CBCT Image Inspection
To perform the CBCT Image Inspection in Smart Plus (PHT-35LHS), the operator should follow the
standards and procedures below.
Before CBCT Image Inspection
1. Run VAKCAP.exe -> Click Settings tab -> Double-click reconstruction.vxm
2. Make sure that the UseArcCut value is as follows:
UseArcCut = 0
If not, change the value, save the file, and exit.
8.1. CBCT Image Inspection Standard
The following phantoms must be prepared in advance to perform CBCT image
inspection.
-
S&C Check Phantom
-
M&R Check Phantom
-
Uniformity Check Phantom
-
Geometry Check Phantom
-
CT Number Check Phantom

High Contrast Resolution & Low Contrast Resolution Standard Value
Parameters
USL
(Upper Specification Limit)
High Contrast Resolution 1.0 mm
Low Contrast Resolution 8.0 mm

Contrast / Noise / Homogeneity Standard Value
Parameters LSL
(Lower Specification Limit)
USL
(Upper Specification Limit)
Contrast <1000HU> 1.50 3.50
Noise 0.00 200.00
Homogeneity 0.00 250.00

Geometry Standard Value
Parameters LSL
(Lower Specification Limit)
USL
(Upper Specification Limit)
Eccentricity 0.97 1.00
Circle Area Ratio 0.80 1.20

CT Number Standard Value
Parameters LSL
(Lower Specification Limit)
USL
(Upper Specification Limit)
Air CT Number -1030 -900
Water CT Number -20 20
Teflon CT Number 900 1100