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Technical
Publication
Direction 5158821-100
Revision 3
GE Healthcare
eXplore Locus SP Service Guide
Copyright 2005 by GE Healthcare
All rights reserved
http://www.gehealthcare.com
This page is intentionally left blank
GE HEALTHCARE
DIRECTION 5158821-100, REVISION 3 EXPLORE LOCUS SP SERVICE GUIDE
- Page3
Revision History
Revision History
Effective
Date
Revision Nature of Change
March 19/05 0 Previously released under eXplore Locus SP Service &
Installation Guide (2407687).
March 24/06 1 Updates to FRUs, Calibration & Troubleshooting.
Reflects latest software release.
Apr. 2/07 2 Changes to calibration procedures.
Addition of Calibration Worksheets.
Addition of electrical block diagram.
Changes to Registry back up.
Addition of Registry Restore procedure.
Addition of Calibration Values Restore procedure.
Addition of Acquisition Computer Replacement procedures
(Dell to HP)
Major changes to Preventive Maintenance chapter.
Sept 26/07 3 Minor changes to calibration procedures.
Remove lexan collimator window if present.
Live animal handling prohibition.
Before
You
Begin
This Guide documents how to service GE’s eXplore Locus SP scanner. It is only
intended for use by GE qualified personnel who have received training on its
operation. The eXplore Locus SP may be not be used or serviced in a manner
outside manufacturer specifications.
This Guide is periodically updated. Please ensure you are using the most
current version by checking the Common Documentation Library (CDL) at:
http://apps.gehealthcare.com/servlet/
ClientServlet?REQ=Enter%2bDocumentation%2bLibrary
GE HEALTHCARE
DIRECTION 5158821-100, REVISION 3 EXPLORE LOCUS SP SERVICE GUIDE
Page 4 -
This page is intentionally left blank
GE HEALTHCARE
DIRECTION 5158821-100, REVISION 3 EXPLORE LOCUS SP SERVICE GUIDE
Page5
Contents
1 Introduction
1.1 Important Precautions .........................................................................11
1.1.1 Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
1.2 Safety & Hazard Information ................................................................14
1.2.1 Text and Character Representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
1.2.2 Standard Hazard Icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.2.3 Lockout / Tagout (LOTO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.2.4 Certified Electrical Contractor Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
1.2.5 Important... X-Ray Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
1.2.6 Live Animal Handling Prohibition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.3 Publication Conventions ......................................................................17
1.3.1 General Paragraph and Character Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
1.3.2 General Installation Safety Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
1.3.3 Omissions, Errors & Suggested Improvements. . . . . . . . . . . . . . . . . . . . . . . . . 18
2 Theory & Components
2.1 Basic Concepts ......................................................................................19
2.1.1 Parts of a CT Scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
2.1.2 Definitions of Basic Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
2.1.3 Image Creation Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.2 Hardware & Software Components .....................................................23
2.2.1 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
2.2.2 Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.3 Managing Files....................................................................................... 27
2.3.1 File Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.2 Files Created During the Acquisition Process . . . . . . . . . . . . . . . . . . . . . . . . . . .27
2.3.3 Files Created During the Reconstruction Process . . . . . . . . . . . . . . . . . . . . . . .28
GE HEALTHCARE
DIRECTION 5158821-100, REVISION 3 EXPLORE LOCUS SP SERVICE GUIDE
Page 6
2.3.4 Removing Unnecessary Scan Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3 Troubleshooting
3.1 Overview................................................................................................. 29
3.1.1 Avoiding Common Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.2 Troubleshoot the System ......................................................................30
3.2.1 Visualization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.2.2 System Wide Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.2.3 Reconstruction Cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.2.4 Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.2.5 Scan Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.2.6 Fluoroscopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.2.7 eXplore Locus SP Electrical Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4 Functional Checks
4.1 Overview .................................................................................................39
4.1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.2 Perform Functional Checks ..................................................................39
4.2.1 X-Ray Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.2.2 Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.2.3 Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.2.4 Comair Rotron Fan FS12B3 (Detector Fan). . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.2.5 Comair Fan 2.0625 (Fan under X-ray Source) . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.2.6 Shutter Drive Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.2.7 X-Ray Indicator Light, Small . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.8 Comair Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.9 Ventilator Hose (PVC, 1"IDX1.21"OD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.10 Interlock, D4DS Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.11 Interrupt Switch, 4600B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
GE HEALTHCARE
DIRECTION 5158821-100, REVISION 3 EXPLORE LOCUS SP SERVICE GUIDE
Page7
5 Software Set Up / Back Up
5.1 Computer Hard Drive ............................................................................43
5.1.1 Ghost an Image on C Drive & Update Software . . . . . . . . . . . . . . . . . . . . . . . . .43
5.2 Back Up & Restore ................................................................................46
5.2.1 Back Up Calibration and Registry Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
5.2.2 Restore Registry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5.2.3 Restore Calibration Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
5.2.4 Acquisition Computer Replacement - Transfer Critical Data . . . . . . . . . . . . . . .51
6 Field Replaceable Units
6.1 Overview .................................................................................................53
6.1.1 Lockout / Tagout (LOTO) Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
6.1.2 Left Access Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
6.1.3 Right Access Panel Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .57
6.1.4 Case Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
6.1.5 X-Ray Shield Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
6.2 Remove / Replace FRUs .......................................................................62
6.2.1 Comair Blower and Hose Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . .62
6.2.2 Right Comair Fan Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
6.2.3 Left Comair Fan Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
6.2.4 Interlock Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
6.2.5 X-Ray Indicator Light Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . .69
6.2.6 Temperature Controller Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . 70
6.2.7 Specimen Stage, Short Limit Switch Removal / Replacement . . . . . . . . . . . . . 72
6.2.8 Magnification Stage Limit Switches Removal / Replacement . . . . . . . . . . . . . . 74
6.2.9 Filter Wheel Assembly Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . .75
6.2.10 Module Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
6.2.11 Rotary Stage Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
6.2.12 Specimen Slide Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
6.2.13 X-Ray Source Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
6.2.14 Shutter Drive Motor Assembly Removal / Replacement . . . . . . . . . . . . . . . . . . .86
6.2.15 Collimator Window Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
6.2.16 Detector Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
6.2.17 Fan 2.0625 (Below X-Ray Source) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
6.2.18 Shutter Control Assembly Removal / Replacement . . . . . . . . . . . . . . . . . . . . . .93
6.2.19 Door Interlocks Removal / Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
GE HEALTHCARE
DIRECTION 5158821-100, REVISION 3 EXPLORE LOCUS SP SERVICE GUIDE
Page 8
7 Calibration
7.1 Overview .................................................................................................97
7.1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
7.1.2 Calibration Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.2 Detector Replacement Calibration ......................................................99
7.2.1 Mechanically Adjust Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
7.2.2 Find X-Ray Mask Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
7.2.3 Start Transform1 File Creation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
7.2.4 Complete Transform1 File Creation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
7.2.5 Create Transform2 & Transform4 Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
7.2.6 Calculate Central Slice of X-Ray Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
7.2.7 Verify Stage Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
7.2.8 Centre the Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
7.2.9 Calculate Source to Detector Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
7.2.10 Edit Calibration Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
7.2.11 Calculate & Edit Magnification Difference . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
7.2.12 Perform Verification Scans (1x1, 2x2 & 4x4 Modes) . . . . . . . . . . . . . . . . . . . . 133
7.2.13 Follow Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
7.3 Stage Replacement Calibration ..........................................................146
7.3.1 Mechanically Align the Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
7.3.2 Centre the Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
7.3.3 Perform Verification Scans (1x1, 2x2, & 4x4 Modes) . . . . . . . . . . . . . . . . . . . 160
7.4 Source Replacement Calibration ........................................................169
7.4.1 Centre X-Ray Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
7.4.2 Centre the Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
7.4.3 Calculate Central Slice of X-Ray Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
7.4.4 Verify Stage Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
7.4.5 Calculate Source to Detector Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
7.4.6 Edit Calibration Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
7.4.7 Calculate & Edit Magnification Difference . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
7.4.8 Perform Verification Scans (1x1, 2x2, & 4x4 Modes) . . . . . . . . . . . . . . . . . . . 194
7.4.9 Follow Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
7.5 Case/Shielding Removal "Abridged" Calibration ............................207
7.5.1 Centre the Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
7.5.2 Perform Verification Scans (1x1, 2x2 & 4x4 Modes) . . . . . . . . . . . . . . . . . . . . 216
7.5.3 Edit Calibration Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
7.5.4 Follow Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
GE HEALTHCARE
DIRECTION 5158821-100, REVISION 3 EXPLORE LOCUS SP SERVICE GUIDE
Page9
8 Preventive Maintenance
8.1 Preventive Maintenance (PM) Introduction .......................................229
8.1.1 Why Do Preventive Maintenance? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .229
8.1.2 Record Keeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .229
8.1.3 Scheduling Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .229
8.1.4 Tools & Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230
8.1.5 SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230
8.2 Preventive Maintenance Procedures .................................................231
8.2.1 X-Ray Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
8.2.2 X-Ray Indicator Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232
8.2.3 Reset Switch Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232
8.2.4 Interlock Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232
8.2.5 Limit Switches on Magnification Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .234
8.2.6 Specimen Slide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .235
8.2.7 Limit Switches On Specimen Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .235
8.2.8 Rotary Stage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .235
8.2.9 Filter Wheel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .235
8.2.10 Shutter Drive Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .236
8.2.11 Rear Exhaust Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
8.2.12 Fan Under X-ray Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .236
8.2.13 Fan Behind The Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .237
8.2.14 Comair Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
8.2.15 Ventilator Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
8.2.16 Fan Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .237
8.2.17 Equalization Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .238
8.2.18 Temperature Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .238
8.2.19 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
8.2.20 Gantry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
8.2.21 Control Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .239
8.2.22 Acquisition Computer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
8.2.23 Perform Periodic Abridged Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
8.3 Preventive Maintenance Checklist..................................................... 241
8.3.1 Completing and Filing the Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
8.3.2 Preventive Maintenance Performance Checklist . . . . . . . . . . . . . . . . . . . . . . .242
GE HEALTHCARE
DIRECTION 5158821-100, REVISION 3 EXPLORE LOCUS SP SERVICE GUIDE
Page 10
99 Appendix
99.1 Calibration Worksheets...................................................................... 245
99.1.1 Detector Replacement Calibration Worksheets . . . . . . . . . . . . . . . . . . . . . . . . 246
99.1.2 Stage Replacement Calibration Worksheets . . . . . . . . . . . . . . . . . . . . . . . . . . 253
99.1.3 X-Ray Source Replacement Calibration Worksheets . . . . . . . . . . . . . . . . . . . 257
99.1.4 Abridged Calibration Worksheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264