6. If a hot spot from the sonication cannot be adequately identified, do the following:
◼ Confirm that no air has entered the balloon-rectal wall interface.
◼ Verify that the energy measured in the last sonication, displayed in the Sonication Measured
Parameters Indicators (see Figure 7-5), is similar to the energy requested.
◼ Increase the sonication energy level in small increments, repeating the geometric verification
sonication until a hot spot is observed.
7. After the Geometric Verification Procedure is successfully completed, advance to the Thermal Dose
Verification Procedure (see Section 7.4.4).
Figure 7-8: Geometrical Adjustment Procedure
◼ Do not continue with the treatment if a hot spot is not adequately visible.
◼ The geometric verification procedure must be repeated if one or more of the
following incidents occur during treatment:
● Repositioning of the probe.
● New planning images are loaded.
● Thermal hot spot is not noticed on thermal imaging sequence during treatment.
● Spot placed in new target location (e.g., bilateral treatment).
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