Hologic DISCOVERY C - Page 5

Discovery QDR Series Technical Manual
Table of Contents v
3.3.4 Start QDR Software in Service Mode ..................................................... 3-24
3.3.5 Check Table Alignment .......................................................................... 3-25
3.3.6 Perform C-Arm Parallelism Adjustment (A and SL systems only) ........ 3-27
3.4 Calibrate and Test the System ......................................................................... 3-28
3.4.1 Check Tube kV Peak Potential ............................................................... 3-28
3.4.2 Check Tube Current ............................................................................... 3-30
3.4.3 Adjust Belt Tension ................................................................................ 3-32
3.4.4 Calibrate Motors ..................................................................................... 3-33
3.4.5 X-Ray Beam Alignment ........................................................................ 3-47
3.4.6 Calibrate Aperture (Cannot be run on Ci and Wi models) ..................... 3-53
3.4.7 Check Laser Positioning Offset .............................................................. 3-54
3.5 A/D Gain Control Adjustment ......................................................................... 3-54
3.5.1 Check and Verify the A/D Gain ............................................................. 3-54
3.5.2 Adjust the A/D Gain ............................................................................... 3-55
3.5.3 Perform Detector Flattening .................................................................. 3-55
3.5.4 Perform Lateral Alignment Test (A and SL) .......................................... 3-56
3.5.5 Check HVPS/S (Tank) For Radiation Leakage ...................................... 3-58
3.5.6 Calibrate For Area, BMD And BMC ...................................................... 3-60
3.5.7 Scan Thickness Measurement & Calibration (C and W) ........................ 3-61
3.5.8 Scan Thickness Measurement & Calibration (A and SL) ....................... 3-61
3.5.9 Calibration of Area and BMC, for Array Scan Modes ........................... 3-62
3.5.10 RECALYZE and Add Array AP Scans to the QC Database ................ 3-63
3.5.11 Install Software Options ....................................................................... 3-64
3.5.12 Test Scan Modes ................................................................................... 3-64
3.5.13 Finish Assembling Unit ........................................................................ 3-66
3.5.14 Measure X-Ray Dose To Patient .......................................................... 3-66
3.5.15 Measure X-Ray Scatter From Phantom ................................................ 3-67
3.5.16 Perform QC ........................................................................................... 3-67
3.5.17 Run Reproducibility Test ...................................................................... 3-67
3.5.18 Table Top Radiographic Uniformity (A, W and Wi) ........................... 3-68
3.5.19 Instruments using Body Composition Analysis (BCA) ........................ 3-69
3.5.20 Instruments using BMD Whole Body Analysis ................................... 3-70
3.6 The Radiation Measurement Report ................................................................ 3-70
Chapter 4 -
ALIGNMENT AND CALIBRATION
4.1 Check Table Alignment ..................................................................................... 4-1
4.2 Align the Table .................................................................................................. 4-1
4.2.1 Table Edge to T-Rail (“A” Dimension) Adjustment ................................ 4-1
4.2.2 Front to Back T-Rail and Table Edge/Rail Gap Adjustment .................... 4-3
4.3 C-Arm Parallelism Adjustment ........................................................................ 4-3
4.4 X-Ray Beam Alignment ................................................................................... 4-4
4.5 Aperture Calibration ......................................................................................... 4-9