HOLOGIC DIMENSIONS

TUBE REPLACEMENT CHECKLIST

Hologic Dimensions • Tube Replacement Checklist

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WORK ORDER INFORMATION

Service Information

Work Order / Job IDSystem Serial NumberTechnician

Service reminder

This is a field checklist based on tube replacement notes. Follow OEM service documentation, radiation safety procedures, site policy, and local regulatory requirements.

Correct Calibration Order After Tube Change

Tube WarmupUse Step 2 only, 25–28 kV, 4–6 manual shots. Step 3 can be ignored.

Large Filament Calibration35 kV only. Complete before Gen kV or Gen mA.

Gen kV CalibrationRun after Large Filament is completed and applied.

Gen mA CalibrationRun after Gen kV.

Small Filament Calibration30 kV.

HVL / TOSmall focal spot first, then Rh, Ag, Al/Tomo, and licensed filters only.

Tube Head CheckLet it cool down if needed.

AEC StartDark Offsets, then Goaltab Gen, then Goaltab Scale.

1. Before Removing or Moving the Old Tube

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GoalGet the new tube into the same physical position as the old tube.

Trace the underside of the collimator cage.Before moving the tube, mark the original position of the collimator cage underside. Trace the washers around the tube bolts.Trace all 4 washer locations around the tube bolts.

If things get out of place

Put the new tube in the middle as best you can. Center it left-to-right and front-to-back.

2. New Tube Installation Details

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Put grease on the tip of the candle stick.Use a small amount of grease on the tip. Use the tube opening to spread grease.Using the opening in the tube, run a little grease around the sides of the candle stick.

Locking collar warning

The locking collar screw must not be directly on top of the tube. If it is on top, the top cover may not fit flush when reinstalled.

Move the locking collar screws slightly to the side.Position the screws on the side a bit so the top cover can sit flush.

3. Tube Warmup

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Important CalTool note

Use the CalTool version for that system. Do not use CalTool 2.2 unless that is the correct version for the unit.

Start with Tube Warmup.Open the correct CalTool version for the system and begin the tube warmup task.

Use Step 2 only

Use Step 2 to take manual shots in the 25–28 kV range.

Take 4–6 manual warmup shots.Use approximately 25–28 kV.

Step 3 can be ignored.

Do not spend time on Step 3 for this process.

4. Large Filament Calibration – 35 kV

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Do this before Gen kV or Gen mA

Large Filament Calibration reloads defaults to the generator node, which gives a better starting point for a new tube.

Start Large Filament Calibration.Run the large filament calibration at 35 kV.

Do not perform the full 20–49 kV calibration.

For this workflow, perform the 35 kV large filament calibration only.

Possible normal error

Toward the end, CalTool may throw an error saying it reached the maximum number of exposures.

If max exposure error appears, clear it.This is normal. Clear the error. (Check only if this condition occurs.) Wait until the system goes Ready again.Once Ready returns, keep shooting. It should finish. (Check only if this condition occurs.)

Do not forget

When the calibration completes, hit the Apply button.

Press Apply.Apply the completed Large Filament Calibration.

5. Generator Calibrations

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Sequence requirement

Only start these after Large Filament 35 kV is completed and applied.

Run Gen kV task.Complete generator kV calibration. Run Gen mA task.Complete generator mA calibration.

6. Small Filament Calibration – 30 kV

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Run Small Filament Calibration.Perform small filament calibration at 30 kV.

7. HVL / TO Calibration

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Read the CalTool words carefully

The first exposure it asks you to make is for the small focal spot. That reading goes into the box on the right, which is the mR reading.

Start HVL / TO.Follow each CalTool prompt carefully. First exposure: small focal spot.Enter this first reading into the right-side mR box. Next step: 22 kV Rh shot.After the small focal spot exposure, CalTool will have you do the 22 kV shot for Rh and so forth. Complete the Rh shots.Finish the Rh sequence before changing to Ag.

Before Ag shots, change the filter in all 3 places

1. The form. 2. CalTool. 3. The Piranha.

Change filter to Ag on the form.Verify the form is set for Ag before recording Ag readings. Change filter to Ag in CalTool.Verify CalTool is on Ag before taking Ag shots. Change filter to Ag on the Piranha.Verify the Piranha is also set for Ag. Complete Ag shots.Take and record the Ag readings.

Al filter / Tomo

The Al filter tomo shots are done on the next step after the Ag sequence.

Proceed to Al filter / Tomo shots.Complete the tomo shots as prompted.

Tomo mR warning

For tomo shots, if the mR goes over 1000, the meter may switch and display the value as R. You still need to enter it into the form as mR. Example: 1.3 R = 1300 mR.

HVL / TO Quick Reference

Step	What To Do	Important Reminder
First Exposure	Small focal spot exposure	Enter into the right-side mR box
Rh	Do the 22 kV Rh shot, then continue Rh sequence	Complete Rh before switching filters
Ag	Switch to Ag and perform Ag shots	Change form, CalTool, and Piranha
Al / Tomo	Perform tomo shots on the next step	If reading displays R, convert to mR
Cu	Only perform if licensed	System may not have a Cu license

8. Licensed Filters and Output Form

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Complete all licensed filters.

The system may not have a Cu license. Do only the filters that are licensed for that system.

Complete all licensed filter steps.Finish Rh, Ag, Al/Tomo, and Cu only if Cu is licensed.

After all licensed filters are complete

Text a picture of the output form for review.

Take a picture of the output form.Send the output form picture before moving too far ahead.

9. Tube Head Check / Cooldown

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At this point, check your tube head.

You may want to let it cool down a bit before continuing.

Check tube head temperature.Confirm whether the tube head needs cooldown time. Let tube head cool if needed.Do not rush into AEC if the tube head is too warm. (Check when confirmed cool or cooldown not needed.)

10. AEC Calibration Start

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AEC order

Start with Dark Offsets, then Goaltab Gen, then Goaltab Scale.

Run Dark Offsets.Start the AEC workflow with Dark Offsets. Run Goaltab Gen.Continue AEC with Goaltab Gen. Run Goaltab Scale.Continue AEC with Goaltab Scale.

More to follow

Additional AEC steps may be required depending on the next instructions and system condition.