Proper balloon inflation is documented via the treatment verification sheet submitted to the RPC. Note that this implies that some form of imaging will be performed for every fraction. The primary concerns here are balloon leakage or deflation. Acceptable forms of imaging would include simulator x-rays, c-arm x-rays, ultrasound or CT scan. For users without x-ray projection imaging, note that CT is acceptable, but for this purpose it need not be a complete scan. A single slice through the balloon center is sufficient. For patients with iodine allergy, instillation of contrast medium into the balloon is contrain-dicated. In such cases, either CT or ultrasound work well. If balloon deflation occurs, a new balloon may be inserted, and the course of treatment completed.
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