5. On the Sagittal Positioning images, verify that the treatment envelope covers the entire designated
region of treatment.
◼ If the treatment envelope does not fully cover the entire designated region of treatment on the
Sagittal images, use the line measurement tool to measure the required degree of the probe
insertion or extraction.
6. Perform the required reposition of the probe (rotation and/or linear displacement) using the
Positioner mechanism and the rulers that are attached to the cradle and the motion unit.
7. From the motion unit controller, run the Motion Test procedure to verify that the probe motion is
not obstructed in its new position.
8. Repeat the procedure in this section, starting in Step 2.
6.4.2. Acquire Calibration Scans
Detecting the optimal value of the MRI Central Frequency prior to the treatment can reduce thermal
imaging shifts during sonications.
During the Calibration scans, the system detects the optimal MRI Central Frequency. This procedure will
occur automatically by the system.
1. Click to initiate the Calibration scans.
2. The MR performs tracking scans to automatically detect the transducer location, followed by an MRI
Central Frequency scan.
3. Next, a Bubble Detection series will be scanned and loaded to the 3rd strip. Review the images to
ensure the following:
◼ No image folds (tissue that overlap tissue)
◼ No bad signal or excessive noise
◼ No artifacts of any kind
4. If the images exhibit any of the above issues, repeat the Calibration scans by clicking .
6.4.3. Verify Acoustic Coupling
Verify proper acoustic coupling between the balloon and the rectal wall.
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