Vatech A9 (PHT-30CSS)
Technical manual
VDH-TeM-098
3 / 214
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3.6. CT Bad Pixel Verification ........................................................................................................... 65
4. CT Geometry Calibration ................................................................................................................ 67
4.1. Sensor Uoffset setting ............................................................................................................... 67
4.2. Bead Phantom Image Acquisition ............................................................................................. 71
4.3. Handle Frame Align ................................................................................................................... 78
5. CT Collimator Alignment ................................................................................................................ 85
5.1. CT Collimator Alignment ............................................................................................................ 85
5.2. CT Collimator Alignment with EzAlign ....................................................................................... 87
6. DAP Calibration ............................................................................................................................... 88
7. CT Number Calibration ................................................................................................................... 92
7.1. Acquire CT Phantom Image ...................................................................................................... 93
Chapter 3. CT Image Evaluation .................................................................................... 100
1. Spatial Resolution(MTF) evaluation ............................................................................................ 100
1.1. Spatial Resolution (MTF) standards ........................................................................................ 100
1.2. Phantom Specification ............................................................................................................. 100
1.3. Test Method ............................................................................................................................. 101
1.4. Test Result ............................................................................................................................... 101
2. Contrast evaluation ....................................................................................................................... 102
2.1. Contrast standards .................................................................................................................. 102
2.2. Phantom Specification ............................................................................................................. 102
2.3. Test Method ............................................................................................................................. 102
2.4. Test Result ............................................................................................................................... 102
3. Noise evaluation ............................................................................................................................ 103
3.1. Noise standards ....................................................................................................................... 103
3.2. Phantom Specification ............................................................................................................. 103
3.3. Test Method ............................................................................................................................. 103
3.4. Test Result ............................................................................................................................... 103
4. Homogeneity evaluation .............................................................................................................. 104
4.1. Homogeneity standards .......................................................................................................... 104
4.2. Phantom Specification ............................................................................................................. 104
4.3. Test Method ............................................................................................................................. 104
4.4. Test R e sult ............................................................................................................................... 104
5. CT Number Accuracy evaluation ................................................................................................. 105
5.1. CT Number standards ............................................................................................................. 105
5.2. Phantom Specification ............................................................................................................. 105
5.3. Test Method ............................................................................................................................. 106
5.4. Test Result ............................................................................................................................... 106
6. High Contrast Resolution evaluation .......................................................................................... 107
6.1. High Contrast Resolution standards ........................................................................................ 107
6.2. Phantom Specification ............................................................................................................. 107
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