Vatech PHT-30CSS - Page 6

Vatech A9 (PHT-30CSS)
Technical manual
VDH-TeM-098
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Chapter 5. PANO Image Evaluation ............................................................................... 137
1. Line Pair Resolution evaluation .................................................................................................. 137
1.1. Resolution standards ............................................................................................................... 137
1.2. Phantom Specification ............................................................................................................. 137
1.3. Test Method ............................................................................................................................. 137
1.4. Test Result ............................................................................................................................... 137
2. Low Contrast Resolution evaluation ........................................................................................... 138
2.1. Low Contrast standards .......................................................................................................... 138
2.2. Phantom Specification ............................................................................................................. 138
2.3. Test Method ............................................................................................................................. 138
2.4. Test Result ............................................................................................................................... 138
3. Noise evaluation ............................................................................................................................ 139
3.1. Noise standards ....................................................................................................................... 139
3.2. Phantom Specification ............................................................................................................. 139
3.3. Test Method ............................................................................................................................. 139
3.4. Test Result ............................................................................................................................... 139
4. Homogeneity evaluation .............................................................................................................. 140
4.1. Homogeneity standards .......................................................................................................... 140
4.2. Phantom Specification ............................................................................................................. 140
4.3. Test Method ............................................................................................................................. 140
4.4. Test Result ............................................................................................................................... 140
5. Collimator Alignment Evaluation................................................................................................. 141
5.1. Collimator Alignment Standard ................................................................................................ 141
5.2. Test Method ............................................................................................................................. 141
5.3. Test Result ............................................................................................................................... 141
Chapter 3. CEPH Image Optimization ......................................................................... 142
1. CEPH Sensor Calibration ............................................................................................................. 142
1.1. Before CEPH sensor calibration .............................................................................................. 142
1.2. CEPH sensor setting ............................................................................................................ 143
1.3. CEPH sensor: Dark calibration ................................................................................................ 144
1.4. CEPH sensor: Bright calibration ........................................................................................... 145
1.5. Bright calibration: 5 points ....................................................................................................... 146
1.6. Bad pixel spec. & definition ..................................................................................................... 148
2. CEPH Geometry Calibration ........................................................................................................ 149
2.1. Lateral Mode Start Position Setting ......................................................................................... 149
2.2. PA Mode Start Position Setting ............................................................................................... 151
2.3. Line Pair Resolution ................................................................................................................ 153
2.4. CEPH Ear-Rod Alignment ....................................................................................................... 154
3. CEPH Collimator Alignment ......................................................................................................... 157
3.1. CEPH Collimator alignment ..................................................................................................... 157