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Performix Pro CT Tube Replacement Procedure

Performix Pro CT tube replacement procedure featuring a step-by-step guide to CT tube removal, installation, calibrations, and finalization. Click here for more information about the CT Tube replacement price.

Disclaimer: The following procedures are provided solely as a reference for verified field service engineers trained specifically on this model. All procedures outlined here should be cross-verified with the model-specific service documents available in the GE Common Documentation Library. MRIPETCTSOURCE assumes no liability for any damages or injuries and encourages adherence to GE’s comprehensive documentation. Use by unauthorized individuals is strictly prohibited, and MRIPETCTSOURCE disclaims responsibility for actions by untrained individuals. Access to this information is restricted to verified field service engineers. Not verified? Click here.

Table of Contents

Performix Pro CT Tube Replacement

Time Required

  • CT Tube Replacement: 2 Hours
  • Calibrations: 10 Hours
  • Total: 12 Hours

Tools Required

  • CT service post and boom
  • Torque wrench and socket drive with 10mm hex bit, 5mm hex bit, and 12 in extension.
  • 3mm and 5mm allen wrench
  • Flat blade screwdriver
  • 0.45 N-m torque driver with flat blade bit
  • Spanner wrench
  • CT service hoist kit (5149069 or 5192679)

Parts and Consumables

  • 2219500-4 Performix Pro-VCT Tube D3194T or 2219500-3 Performix PRO 100 VCT Tube Unit Assembly D3193T.
  • Tube mounting hardware
  • High voltage well O-ring
  • HV Dielectric Transformer Oil
  • Syringe
  • Dry wipes
  • Latex or nitrile gloves
  • Ty-wraps

Verify new tube part number matches with tube currently installed on system before proceeding.

Performix Pro CT Tube Removal Procedure

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  1. Remove the right side gantry cover.
  2. Turn off HVDC ENABLE, AXIAL DRIVE ENABLE, and 120 VAC ENABLE switches on the Service Switch Panel.
  3. Remove the mylar scan window, gantry left side cover, gantry top covers, and gantry front cover.
  4. Using a 10mm hex bit, remove M12 bolts holding the right front gantry cover mounting bracket. Note: It may be necessary to tilt the gantry back to access the third bolt (not normally installed).
  5. Remove power from the CT system and perform lockout-tagout procedure.
  6. Rotate the gantry so that the High Voltage Tank is in the 3 o’clock position and engage rotational lock.
  7. Cut Ty-wraps on Inverter and Auxiliary Box clamps.
  8. Remove the High Voltage cable from clamps.
  9. Loosen the High Voltage cable locking ring with a spanner wrench.
  10. Remove the High Voltage cable candlestick by slowly pulling the HV cable up. Before completely extracting candlestick, ground all HV cable pins by touching each pin to the metal edge of the HV receptacle. Cover candlestick to protect from damage.
  11. Use Dry Wipes to soak up the oil in the High Voltage Tank receptacle. Place a cap or paper towel in the top of the receptacle to prevent residual oil spillage and dirt contamination.
  12. Remove failsafe C-spacers from the left and right sides of the CT tube using a 5mm Allen wrench. Note: Keep the hardware.
  13. Disengage the rotational lock and rotate gantry so that the X-ray tube is in the 3 o’clock position. Engage rotational lock. Note: Exercise caution as the gantry may violently rotate if not securely locked.
  14. Carefully cut Ty-wraps and disconnect the thermal sensor cable from the Heat Exchanger Power Interface Board J7 connector.
  15. Remove the dial-mounting bracket with a flat blade screwdriver.
  16. Carefully cut Ty-wraps and disconnect the anode stator cable from the Auxiliary Box J1 connector.
  17. Remove the clamp holding the anode stator cable to the Auxiliary Box. Note: Keep clamp hardware.
  18. Remove the Z-Alignment adjuster block assembly with a 3mm Allen Wrench.
  19. Remove Pump-to-Tube and Heat Exchanger-to-Tube quick-disconnect safety mechanism bolts with a 3mm Allen Wrench. Note: Use new quick-disconnect safety bolts (shipped with tube).
  20. Align the quick-disconnect pin with the slot and disconnect the Pump from the Tube.
  21. Insert the lifting post into the gantry frame and attach the boom and hoist.
  22. Disconnect the Smart ID cable from the Tube Smart ID board and cut the Ty-wrap holding the cable to the Tube lifting bracket.
  23. Connect the hoist hook to the Tube lifting point and remove all slack in the chain. Note: Ensure the hoist joint is centered directly above the tube with the chain hanging vertically. Do not overtighten the chain. The tube should not move when mounting bolts are removed.
  24. Remove the two bottom M12 mounting bolts with a 10mm hex bit socket drive and a 12-inch extension. Note: Discard the mounting bolts and washers. Mounting hardware is delivered with the new tube.
  25. Remove the two upper M12 mounting bolts with a 10mm hex bit socket drive and a 12-inch extension. Note: Be careful not to damage the fragile copper filter on the tube window during the next steps.
  26. Remove the cover from the new Tube crate, flip it over, and place it on the floor below the suspended old tube. Note: The cover becomes the base of the container for returning the old tube from the field.
  27. Place the old Tube on the crate cover for shipping. Note: Secure the old Tube to the Tube crate cover using adjustable straps.

CT Tube Installation

Before installing the new CT tube, check the collimator tube-side port on the interposer plate. Remove plastic scan window protector. Additionally, allow the new tube to warm to room temperature before installation.

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  1. Remove the Tube crate middle section and attach it to the Tube crate cover holding the old Tube. Remove adjustable straps from the new Tube.
  2. Attach the hoist hook to the Tube lifting point and lift the new Tube free from the Tube crate. WARNING CRUSH POINT – the Tube lies on its side in the Tube crate and will flip 90 degrees when raised. Use care when hoisting the Tube to avoid equipment damage.
  3. With the Tube suspended, remove the plastic protective cover and visually inspect the copper filter. The copper filter should be clean, dent-free, and scratch-free. Slight discoloration is acceptable but the copper filter should show no signs of overheating.
  4. Carefully swing the Tube into position on the gantry. Note: The Tube casing should slide in between the Collimator frame fingers. When positioning the tube, be careful with the copper filter. It should be free of debris, scratches, and dust, as particles can create artifacts in the image by affecting copper filter attenuation properties.
  5. Using the new pre-assembled mounting hardware shipped with the Tube, align the Tube mounting through-holes with the Collimator frame mounting points. Note: There is a POTENTIAL FOR PATIENT INJURY. X-RAY TUBE IS ON ROTATING ASSEMBLY. SELECT THE PROPER BOLT KIT FROM THE TUBE CRATE BASED ON SYSTEM TYPE. NEVER MIX MOUNTING HARDWARE TYPES. WARNING EJECTION HAZARD. THE TUBE MAY EJECT IF IMPROPER MOUNTING HARDWARE COMBINATION IS USED. READ THE FOLLOWING INSTALLATION INSTRUCTIONS CAREFULLY TO ENSURE PROPER MOUNTING HARDWARE IS USED.
  6. Hand turn the four M12 mounting bolts into the Tube holes a few turns. Note: Make sure the Tube is laying flat. Using the ISO adjustment bolt to move the interposer plate up or down can aid in getting the Tube to lie flat.
  7. Detach the hoist hook from the Tube lifting point.
  8. Disengage the rotational lock.
  9. Rotate the Tube to the 12:00 o’clock position.
  10. Engage the rotational lock.
  11. Move the Tube until it settles into its centered position on the interposer plate. Visually inspect that the Tube position is close to centered in the Z-direction.
  12. Tighten each M12 mounting bolt on CT Tube mounting assembly in a cross pattern configuration to “Final Torque” (49 lbf-ft, 66 N-m, 590 lbf-in, 680 kg-cm). (10mm hex bit socket, torque wrench and 12 inch extension).
  13. Place the original Tube crate base on top of the crated old Tube and secure its locking hardware. Move the Tube crate to a secure location to provide easier access to CT gantry.
  14. Remove the hoist, boom and post assembly from the gantry and store.
  15. Connect the Smart ID cable to the Smart ID board and Ty-wrap the cable to the Tube lifting bracket.
  16. Connect the Heat Exchanger hose male quick-disconnect to the Tube female quick-disconnect.
  17. Connect the Pump hose female quick-disconnect to the Tube male quick-disconnect.
  18. Secure the Heat Exchanger-to-Tube and Pump-to-Tube quick-disconnect safety mechanisms with the hardware shipped with the Tube. Tighten each safety mechanism M6 bolt, using a 5 mm hex bit socket torque wrench, to the specified torque values (7.3 lbf-ft, 9.9 N-m, 88 lbf-in, 101 kg-cm). Note: Do not over-torque M6 bolts, as doing so can cause the quick-disconnect to leak.
  19. Attach the Z-Alignment adjuster block assembly with a 3mm Allen Wrench.
  20. Connect the anode stator cable to the Auxiliary Box J1 connector.
  21. Place a clamp around the anode stator cable’s exposed shield and attach the clamp to the Auxiliary Box with a 3mm Allen Wrench.
  22. Attach the dial-mounting bracket to the Tube and tighten each captive screw with a flat blade bit torque driver to 0.45 N-m or 4.0 lbf-in.
  23. Connect the thermal sensor cable to the Heat Exchanger Power Interface Board J7 connector and appropriately secure it with Ty-wrap(s).
  24. Attach the 2 Failsafe C-spacers to the right and left sides of the Tube with a 5mm Allen Wrench. Warning: PATIENT OR OPERATOR CRUSH HAZARD. IMPROPER MOUNTING CAN RESULT IN TUBE EJECTION AND SERIOUS INJURY. MOUNT THE TUBE ACCORDING TO INSTRUCTIONS, INCLUDING NEW MOUNTING HARDWARE AND C-SPACERS.
  25. Disengage the rotational lock and rotate the gantry such that the High Voltage Tank assembly is in the 3 o’clock position. Engage the rotational lock.
  26. Replace the High Voltage Tank well O-ring with the new O-ring shipped with the Tube. Perform Securing the HV Cable procedure. Manually rotate the gantry, at least one full revolution, and verify that no oil leak occurs.
  27. Install the right gantry front cover bracket. Manually rotate the gantry, at least one full revolution, and verify that no rubbing occurs. Also verify no oil leak occurs.
  28. Turn on the 120 VAC ENABLE, AXIAL DRIVE ENABLE, and HVDC ENABLE switches on the Service Switch panel.
  29. Press ESTOP RESET (on the Service Switch panel) and wait until the scan hardware is reset.

Setup, Checks, Alignments, and Calibrations Procedures

If the GSI option is not installed on your system, it is not necessary to perform the GSI calibrations. Note: If the tube replacement was due to a leak in the Tube Oil Cooling system, perform the Tube Oil Cooling System Air Removal.

  1. Change to the correct Tube Bearing Type using the hardware screen in Reconfig before the TIC tool or any alignment exposures.
  2. Perform the Tube Install Certification.
  3. Reset TnT (Only select Tube TnT Data).
  4. Perform the Gantry Rotation Safety Check. Note: (For GE Healthcare Personnel Only) For supported software releases, perform the Tube Alignment (Restricted) procedure instead of Z-Alignment and Cold Iso Alignment procedures. (For LightSpeed VCT Systems only) Tube Alignment (Restricted) procedure is not supported by software 07MW18.4 or releases prior to 09MW08.10. Instead, perform Z-Alignment and Cold Iso Alignment procedures.
  5. Perform the Z-Alignment.
  6. Perform the Cold ISO Alignment.
  7. Perform the Gantry Balance Procedure.
  8. Perform the Meter Verification. Note: (For GE Healthcare Personnel Only) For supported software releases, perform the High Voltage Tank Feedback Resistor Verification (Restricted) and Internal Scan Timer Verification (Restricted) procedures instead of the High Voltage Tank Feedback Resistor Verification procedure.
  9. Perform High Voltage Tank Feedback Resistor Verification.
  10. Perform Filament Calibration. Note: The filament calibration should meet specifications now as the Focal Spot has been defined (i.e., Verify Filament Cal values in the report. Fit <10, Delta <14).
  11. Perform HHS Scans.
  12. Perform Hot ISO Alignment. Note: Allow at least a 10-minute cooling period for the tube before completing next steps. Turn off the 120 VAC power to the gantry. Failure to allow a proper tube cool-down period may result in tube damage.
  13. Turn off HVDC ENABLE, AXIAL DRIVE ENABLE, and 120 VAC switches on the Service Switch panel.
  14. Install the gantry front cover, gantry top covers, gantry left side cover, and scan window.
  15. Turn on 120 VAC, AXIAL DRIVE ENABLE, and HVDC ENABLE switches on the Service Switch panel.
  16. Press ESTOP RESET on the Service Switch panel and wait until the scan hardware is reset.
  17. Install the right side gantry cover.
  18. Perform Collimator Calibration.
  19. Perform Detailed Calibration.
  20. Perform Fastcals (Fast Calibration).

Finalization Procedure

  1. Perform a System Scanning Test to ensure proper functionality.
  2. Conduct a Quality Assurance Test to verify the performance of the system.
  3. Perform New Tube Configure.
  4. Save Generator Runtime Parameters.
  5. Save the System State.

Additional Resources

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