Page 2of 244
Table of Contents
Before you begin ..............................................................................................................................4
Chapter 1. Hardware Part Service Guide ......................................................................................9
1.1. vatech A9(PHT-30CSS) System Block Diagram............................................................................. 9
1.2. vatech A9 (PHT-30CSS) Board Configuration.............................................................................. 10
1.3. vatech A9(PHT-30CSS) Connection Diagram............................................................................... 24
1.4. Disassembly of vatech A9(PHT-30CSS) Covers .......................................................................... 32
Chapter 2. CT Image Optimization..............................................................................................54
2.1. Geometry information..................................................................................................................... 54
2.2. Equipment default values .............................................................................................................. 55
2.3. CT Sensor Calibration .................................................................................................................... 58
2.4. CT Bad Pixel Verification................................................................................................................ 71
2.5. CT Geometry Calibration................................................................................................................ 73
2.6. CT Collimator Alignment ................................................................................................................ 98
2.7. DAP Calibration............................................................................................................................. 103
2.8. CT Number Calibration ................................................................................................................. 107
Chapter 3. CT Image Evaluation ...............................................................................................116
3.1. Spatial Resolution(MTF) evaluation .............................................................................................116
3.2. Contrast evaluation........................................................................................................................118
3.3. Noise evaluation............................................................................................................................ 120
3.4. Homogeneity evaluation............................................................................................................... 121
3.5. CT Number Accuracy evaluation................................................................................................. 122
3.6. High Contrast Resolution evaluation.......................................................................................... 124
3.7. Low Contrast Resolution evaluation........................................................................................... 126
3.8. Slice Thickness Evaluation .......................................................................................................... 127
3.9. Collimator Alignment Evaluation................................................................................................. 128
Chapter 4. PANO Image Optimization ......................................................................................130
4.1. Geometry information................................................................................................................... 130
4.2. Equipment default values ............................................................................................................ 131
4.3. PANO Sensor Calibration ............................................................................................................. 131
4.4. PANO Collimator Alignment......................................................................................................... 139
4.5. PANO Collimator Speed Alignment............................................................................................. 142
4.6. PANO Geometry Calibration ........................................................................................................ 148
4.7. Vertical Laser Beam Alignment ................................................................................................... 153
Chapter 5. PANO Image Evaluation ..........................................................................................154
5.1. Line Pair Resolution evaluation .................................................................................................. 154
5.2. Low Contrast Resolution evaluation........................................................................................... 155
5.3. Noise evaluation............................................................................................................................ 156
5.4. Homogeneity evaluation............................................................................................................... 157
5.5. Collimator Alignment Evaluation................................................................................................. 158
Chapter 6. CEPH Image Optimization .......................................................................................160
6.1. CEPH Sensor Calibration ............................................................................................................. 160
6.2. CEPH Geometry Calibration ........................................................................................................ 173
6.3. CEPH Collimator Alignment......................................................................................................... 181
6.4. How to use V.I.P.S.......................................................................................................................... 185
