TomoTherapy Hi-Art Treatment System
TomoTherapy · Model Hi-Art Treatment System
Incorporates easy-to-use software for treatment planning, quality assurance, patient set-up and treatment delivery, all using the same secure centralized database. Includes a powerful, 32-processor computer system that rapidly creates sophisticated IMRT plans. Stores all patient and plan information in a single location; removing the risk of data transfer errors. Delivers helical (continuous 360º) IMRT that uses tens of thousands of narrow beamlets, all targeting the tumor and individually-optimized to contribute to the total tumor dose. Offers by far the most beamlets of any form of IMRT, which translates to the most precise conformal radiotherapy available. Ensures accurate delivery of precise helical IMRT plans via 3D image-guided set-up, based on daily pre-treatment CT scans. Increases clinical confidence because it integrates imaging into the treatment geometry; images are fundamentally in the same frame-of-reference as the treatment beams
Key tips
- ·Never bypass a radiation interlock to "just get the image" - this is one of the few true zero-tolerance rules in BMET work.
- ·Trend image-quality phantom results over time - drift shows up before an outright failure does.
- ·Portable/mobile units take real physical abuse from transport - check wheel locks and cable strain reliefs more often than fixed units.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
X-ray tube overheating / filament failure
HighSymptoms: Tube won't fire, heat-capacity alarm.
Root cause: Filament wear, cooling failure.
Detector calibration drift
MediumSymptoms: Image noise, artifacts, low SNR.
Root cause: Flat-panel / sensor aging.
Generator / high-voltage fault
HighSymptoms: Exposure fails, kV/mA out of range error.
Root cause: HV tank or generator board fault.
Recon / system software hang
LowSymptoms: Frozen console, acquisition timeout.
Root cause: Workstation or RAID degradation.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
Flat-panel detector
Class Major service partRel. cost $$$$R&R Expert-level
Cooling pump & radiator
Class Periodic replacementRel. cost $$$R&R Difficult
High-voltage generator
Class Major service partRel. cost $$$$R&R Expert-level
Workstation RAID / GPU
Class Periodic replacementRel. cost $$$R&R Difficult
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Flat-panel detector | Major service part | $$$$ | Expert-level |
| Cooling pump & radiator | Periodic replacement | $$$ | Difficult |
| High-voltage generator | Major service part | $$$$ | Expert-level |
| Workstation RAID / GPU | Periodic replacement | $$$ | Difficult |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Daily QC per modality: image-quality phantom test
- ·Tube and detector inspection
- ·Annual state-required radiation safety survey
- ·Vendor-scheduled preventive maintenance
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: X-ray tube overheating / filament failure
- Confirm the presentation - typically tube won't fire, heat-capacity alarm - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: filament wear, cooling failure.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the x-ray tube insert per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Detector calibration drift
- Confirm the presentation - typically image noise, artifacts, low SNR - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: flat-panel / sensor aging.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the flat-panel detector per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Radiology / Imaging department
- Emergency Department (portable units)
- Operating Room (C-arms)
- Cath lab
- Bedside ICU (portable X-ray)
Documents & Manuals
Safety & Recalls
Synced live from the FDA openFDA API.
- RECALL
Accuray has become aware of a potential safety issue related to the TomoTherapy Treatment System caused by a failure to monitor the jaw position after a jaw error occurs. This may result in an incorrect jaw position during treatment, without generating system interruption.
- RECALL
Accuray is voluntarily recalling TomoTherapy H Series software versions 1.2.0, 1.2.1 and 1.2.2 (Hi-Art 4.2.0, 4.2.1 and 4.2.2). Accuray has identified potential safety issues (anomalies) with these software versions.
- RECALL
Accuray is voluntarily recalling TomoTherapy H Series software versions 2.0.0 and 2.0.1 (Hi-Art 5.0.0 and 5.0.1). Accuray has identified potential safety issues (anomalies) with these software versions.
- RECALL
It was determined that the Treatment Planning Station (TPS) can potentially under dose.
- RECALL
TomoTherapy Inc. is sending this Field Safety Notice to make you aware of an anomaly which may affect the performance of the Hi-Art System and make it so the user cannot generate a Completion Procedure.
- RECALL
An issue has been identified, as a result of input received from one TomoTherapy Hi-Art Treatment System customer. With a particular workflow, the Planning Station's Draft and/or final Plan Report can provide incorrect dose statistics.
- RECALL
In some cases, the patient's diagnostic CT image is narrower than the Hi-Art radiotherapy couch image.
- RECALL
An issue was identified with the TomoTherapy HI-Art System. In the event a patient or DQA plan has a moved image, roll adjustments applied during registration will be incorrect. The Planning Station Plan Settings and DQA Setup tabs allow for images to be moved during planning. During registration when roll is applied on moved images, the Operator Station incorrectly rolls the image about
- RECALL
TomoTherapy received one customer report indicating that after starting a patient procedure from the Status Console, the radiation on light and the audible indicator on the Status Console came on as expected, however the Operator Station (OS) did not display the dose rate and the procedure time, or the couch position updates. Within a few minutes, the customer pressed the Stop button on the Sta
- RECALL
TomoTherapy Incorporated identified a potential issue with the Hi-Art system during the course of ongoing testing. The Operator Station Calibration panel provides access to view and modify machine specific configuration settings. Access to these settings has always been restricted to individuals with appropriate security rights, being limited to only the "Superuser" and "Field Service engine
- RECALL
TomoTherapy Inc. discovered an issue on the Hi-Art system during the course of ongoing testing. It has been identified that treatment plans involving very small structures (volume <2cc), reading in a high dose gradient region, may exhibit inaccuracies with the DVH curve and the Dose Statistics for the small structures. This error can only happen if planning was performed using very small voxels
- RECALL
Registration adjustment field numbers may appear on printed pages of the Register Tab as nonsense characters or values different than the numbers shown on the Operator Station (OS) display. Setup will move the couch to the correct offset position. If the couch is manually adjusted to the incorrect value, the patient may not be the correct position during treatment.
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