Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions Page 32
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32
b) Angular tube current modulation:
Based on the above described axial tube current pro-
files the tube current is modulated during each tube
rotation. Therefore the angular attenuation profile is
measured on-line during the scan and the tube current
is modulated accordingly in real time to achieve an
optimum distribution of the x-ray intensity for every
viewing angle.
General
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
stro
n
g
in
cre
a
se
constant dose
average increase
w
ee
k in
cre
a
se
constant image noise
rel. tube current
rel. attenuation
reference attenuation
week decrease
average decrease
strong decrease
Image Quality
reference tube current
slim
obese
Relation between relative attenuation and relative
tube current. The adaptation strength may be adjusted
by user separately for the left branch (slim) and the
right branch (obese) of the curve. This adjustment
effects all examinations. The gray lines here indicates
the theoretical limits of the adaptation (constant dose
resp. constant image noise). The absolute (eff.) mAs
value is scaled with the “Image Reference mAs” value,
which may be adjusted in the Scan Card by the user.
- SOMATOM 1
- Sensation Cardiac 1
- Application Guide 1
- User Documentation 14
- Concept of Scan Protocols 16
- Straton-Tube (optional) 17
- Scan Set Up 17
- Scan Modes 18
- Slice Collimation and 19
- Slice Width 19
- Increment 20
- Image Filters 23
- Improved Head Imaging 25
- Head image without 26
- Head image with 26
- Dose Information 27
- CARE Dose 4D 30
- Image Quality 32
- 100kV-Protocols 40
- WorkStream4D 42
- Auto Load in 3D and 52
- Postprocessing Presets 52
- How to Create your own 53
- Contrast Medium 58
- Relative Enhancement [HU] 60
- Time [s] 60
- General Application 65
- Information 65
- HeartView CT 70
- Heart Anatomy 70
- Recon Jobs for Postprocessing 89
- Postprocessing on the 3D Card 96
- CaScoreRoutine 100
- CaScoreFast 101
- CaScoreSeq 102
- Prerequisites 105
- General Workflow 106
- Additional Information 113
- CoronaryCTA 116
- Hints in General 118
- CoronaryCTARoutine 120
- CoronaryCTAFast 121
- CorCTALowHeartRate 122
- CoronaryCTA100kV 123
- CoronaryCTAAdaptSpeed 124
- 3D Recon Protocols 126
- CoronaryCTAVol 128
- CoronaryCTALowHeartRateVol 129
- CoronaryCTAAdaptedSpeedVol 130
- 4DCTAVol 131
- 4DCTALowHeartRateVol 132
- Aortic and Pulmonary Studies 133
- ThorAngioECG 134
- ThorAngioECGSeq 135
- ThoraxECGHRSeq 136
- 4D Viewer 138
- “Clinical Applications 2“ 139
- Key Features 140
- Case Examples 156
- Preparation 165
- Scan Protocols 166
- Image Reconstruction 168
- Different Heartphases: 168
- Thickening Bulls Eye 181
- Overview 184
- Children 184
- HeadRoutine 192
- HeadRoutine05s 194
- HeadSeq05s 198
- InnerEar 200
- InnerEarSeq 202
- SinusOrbi 204
- NeckRoutine 208
- ThoraxRoutine 210
- ThoraxCombi 212
- ThoraxHRSeq 214
- AbdomenRoutine 216
- SpineRoutine 218
- SpineThinSlice 220
- ExtrUHRRoutine 222
- ExtremityCombi 224
- HeadAngio 226
- CarotidAngio/ 228
- CarotidAngio042s (optional) 228
- BodyAngio/BodyAngio042s 230
- (optional) 230
- NeonateBody/ 232
- NeonateBody042s (optional) 232
- HeadRoutineSeq 242
- InnerEarUHR 248
- SinusOrbiVol (optional) 254
- NeckThinSlice 264
- Shoulder 266
- ThoraxHR 280
- ThoraxECGHRSeq (optional) 284
- LungLowDose 286
- LungCARE 288
- AbdomenCombi 296
- AbdMultiPhase 298
- CTColonography 303
- SI_Joints 312
- Indications: 318
- SpineVol (optional) 324
- SpineSeq 326
- Upper Extremities 330
- WristUHR 334
- ExtrRoutineUHR 336
- ExtrCombi 337
- Lower Extremities 338
- Vascular 348
- HeadAngio100kV (optional) 354
- CarotidAngio 356
- CarotidAngioVol (optional) 358
- ThoraxAngioRoutine/ 360
- ThoraxAngio042s (optional) 360
- ThoraxAngioVol (optional) 362
- ThoraxAngioECG/Thorax 364
- AngioECG042s/Thorax 364
- AngioECG037s (optional) 364
- Embolism/Embolism042s 366
- Embolism100kV 368
- BodyAngioRoutine 370
- BodyAngioFast/ 372
- BodyAngio042s (optional) 372
- BodyAngioVol (optional) 374
- AngioRunOff 376
- WholeBodyAngio 378
- Specials 380
- 1. PolyTrauma 380
- 2. Biopsy 380
- 3. CAREVision 380
- 4. TestBolus 380
- The Basics 381
- How to do it 382
- Interventional CT 384
- CARE Vision 386
- Application Procedure 391
- TestBolus 394
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