For treatment verification, which imaging step is performed before each fraction?

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Multiple Choice

For treatment verification, which imaging step is performed before each fraction?

Verifying the patient’s position and alignment before every treatment fraction is essential to ensure the beam is delivered to the exact planned target. Cone-beam CT in the treatment room provides a 3D image of the patient in the actual setup for that fraction and is compared with the planning CT. Any detected setup errors are corrected with couch adjustments (and sometimes rotational corrections) so the daily dose matches the treatment plan. This step improves precision, allows tighter treatment margins, and reduces the risk of missing the target. MRI is typically used for planning or diagnostic assessment rather than daily verification in the treatment room, and ultrasound or post-treatment imaging does not provide the necessary pre-fraction verification to ensure accurate delivery.

Verifying the patient’s position and alignment before every treatment fraction is essential to ensure the beam is delivered to the exact planned target. Cone-beam CT in the treatment room provides a 3D image of the patient in the actual setup for that fraction and is compared with the planning CT. Any detected setup errors are corrected with couch adjustments (and sometimes rotational corrections) so the daily dose matches the treatment plan. This step improves precision, allows tighter treatment margins, and reduces the risk of missing the target. MRI is typically used for planning or diagnostic assessment rather than daily verification in the treatment room, and ultrasound or post-treatment imaging does not provide the necessary pre-fraction verification to ensure accurate delivery.

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