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What This Guide Helps With
Troubleshooting BioMatrix sensor or respiratory signal issues caused by patient setup, sensor placement, accessories, or connection problems.
Step-by-Step Troubleshooting
Ensure Patient Safety First
If the respiratory signal is being used for gated imaging, pause the scan before troubleshooting.
Confirm the patient is stable, comfortable, and able to continue the exam. If patient monitoring or respiratory gating is unreliable, do not continue gated sequences until the issue is corrected.
Expected outcome: The patient is safe, and troubleshooting does not interfere with active imaging or monitoring.
Confirm the Reported Fault
Review the operator-reported issue at the MRI console.
Confirm whether the problem is:
- No respiratory waveform
- Weak or inconsistent respiratory signal
- BioMatrix sensor not detected
- Respiratory gating not triggering
- Signal dropouts during scanning
- Fault occurring only on certain exams or patient positions
Expected outcome: The failure mode is clearly identified before accessories or hardware are suspected.
Check Whether the Exam Requires Respiratory Gating
Confirm whether the selected protocol or sequence depends on respiratory triggering or motion sensing.
If the current scan does not require respiratory gating, verify whether the fault is informational or actually preventing the exam.
Expected outcome: The issue is matched to the clinical workflow, and unnecessary troubleshooting is avoided.
Verify Patient Positioning on the Table
Confirm the patient is positioned correctly on the MAGNETOM Vida table and within the expected sensing area for the BioMatrix system.
Reposition the patient if they are shifted too far superior, inferior, or off-center relative to the sensor area.
Expected outcome: Proper positioning improves signal detection if the issue was caused by poor patient alignment.
Check for Excessive Patient Motion
Ask the technologist whether the patient is moving, talking, coughing, shallow breathing, or unable to follow breathing instructions.
Respiratory motion sensing may become unreliable if the breathing pattern is irregular or too shallow.
Expected outcome: The signal stabilizes when patient motion and breathing pattern are controlled.
Inspect External Respiratory Accessories
If an external respiratory belt, cushion, sensor, or connection accessory is being used, inspect it for:
- Incorrect placement
- Loose connection
- Damaged cable jacket
- Bent connector
- Strain at the connector
- Contamination or liquid exposure
- Incorrect accessory for the scanner or protocol
Expected outcome: Any obvious accessory issue is corrected before internal scanner failure is suspected.
Reseat the Respiratory Sensor Connection
Remove and reconnect the respiratory accessory or sensor cable at the approved external connection point.
Make sure the connector is fully seated and not under tension when the table moves.
Expected outcome: The respiratory signal returns if the fault was caused by a loose or partially seated connection.
If this resolves the issue, stop troubleshooting and document the corrected connection.
Try a Known-Good Respiratory Accessory
Swap the respiratory belt, cushion, or patient sensor accessory with a known-good compatible accessory.
Do not use damaged or questionable MRI accessories on a patient.
Expected outcome: If the signal returns with the known-good accessory, the original accessory should be removed from use and replaced.
Inspect the Table Area for Obstruction or Misrouting
Check that sensor cables are not pinched, stretched, trapped under pads, routed through moving table areas, or interfering with coils.
Confirm table movement does not pull on the accessory connection.
Expected outcome: Signal dropouts stop if the issue was caused by cable strain or movement-related interruption.
Check Coil and Pad Setup
Confirm the receive coils, table pads, and patient positioning aids are installed correctly and not preventing proper respiratory signal detection.
Make sure no unnecessary padding or accessory placement is blocking the expected sensing area.
Expected outcome: Respiratory signal quality improves after the patient setup is corrected.
Restart the Patient Setup Workflow
Have the technologist exit the affected patient setup or gating workflow and re-enter the setup process.
Reconfirm patient position, respiratory signal display, and gating readiness before restarting the scan.
Expected outcome: A software workflow or setup recognition issue clears without deeper service intervention.
Power Cycle Only When Safe and Appropriate
If the issue persists and the room is not in active patient use, follow the site-approved process to restart the scanner console or affected workflow system.
Do not interrupt active scanning or emergency workflow without clinical approval.
Expected outcome: Temporary communication or software recognition issues clear after restart.
Check Whether the Fault Is Reproducible
Test the BioMatrix or respiratory signal function using a controlled setup, known-good accessory, and standard patient positioning.
Determine whether the issue occurs:
- With all patients
- With one specific accessory
- With one table position
- Only during table movement
- Only with certain coils or protocols
- After system restart
Expected outcome: The fault is isolated to setup, accessory, workflow, or scanner-side behavior.
Review System Messages and Error History
Record any scanner messages, fault codes, timestamps, or respiratory signal warnings reported by the console.
Do not clear useful diagnostic information before documentation or escalation.
Expected outcome: Service escalation has enough detail to identify whether the fault is accessory-related, software-related, table-related, or internal.
Remove Any Failed Accessory from Service
If a respiratory accessory, belt, or cable is found damaged or unreliable, remove it from clinical use and label it appropriately.
Replace it with a verified compatible accessory.
Expected outcome: The scanner can continue clinical use only if respiratory sensing is reliable with a known-good accessory.
If the Problem Persists
If patient positioning, accessory placement, cable routing, known-good accessories, workflow reset, and restart do not restore a reliable respiratory signal, common external causes have been ruled out.
The issue may involve the BioMatrix sensing system, table interface, respiratory signal processing path, scanner software, or internal communication hardware.
The device or affected function should be:
- Removed from clinical use if respiratory gating or patient motion sensing is required
- Labeled Out of Service or restricted from gated exams
- Sent for Siemens service evaluation or internal bench/escalation review per site policy
Knowing when to stop is proper troubleshooting. Do not continue repeated scan attempts when respiratory gating is unreliable.
Clinical Use Tip
Do not troubleshoot BioMatrix or respiratory signal faults during an active scan unless the sequence is paused and the patient is safe. If respiratory gating is required for the exam and the signal cannot be trusted, move the patient to another scanner or use an approved alternate imaging workflow.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"MRI technologist reported that the Siemens MAGNETOM Vida was not detecting a usable BioMatrix respiratory signal during gated abdominal imaging."
Cause
What was observed during troubleshooting.
Example:
"Checked patient setup and found the respiratory accessory cable partially seated and under tension during table movement."
Resolution
What action was taken.
Example:
"Reseated and rerouted the respiratory accessory cable, verified stable respiratory waveform with table movement, and returned the scanner to service."
Helpful Details to Include (If Known)
- Exact BioMatrix or respiratory fault message
- Whether the signal was missing, weak, or intermittent
- Patient position on table
- Whether respiratory gating was required
- Accessory used
- Known-good accessory swap result
- Cable routing condition
- Coil and pad setup
- Whether table movement affected the signal
- Restart or workflow reset performed
- Error timestamp
- Final scanner status
Final Thought
BioMatrix and respiratory signal troubleshooting should begin with patient safety, setup, positioning, and accessory checks before scanner-side failure is assumed. A weak or missing respiratory signal can affect gated imaging quality and should not be ignored. Clear CCR documentation helps separate accessory problems from true scanner faults and supports proper escalation when needed.
That is successful troubleshooting.