Which imaging modality is used daily to verify patient alignment during radiotherapy?

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Multiple Choice

Which imaging modality is used daily to verify patient alignment during radiotherapy?

Explanation:
Daily image guidance in radiotherapy relies on obtaining a volumetric image of the patient in the treatment setup to verify that the target is positioned correctly and nearby organs are safe. Cone-beam CT is integrated into many linear accelerators and provides a 3D image of the patient in the exact treatment position. By comparing this CBCT image to the planning CT, clinicians can make precise couch shifts or adjustments before delivering each fraction, ensuring accurate targeting and protection of healthy tissue. PET-CT and MRI are diagnostic/imaging modalities used for planning or staging and are not routinely employed for every-treatment-fraction alignment. Ultrasound is used in some centers for specific sites, but it is not as universally reliable or integrated for daily 3D alignment verification as cone-beam CT.

Daily image guidance in radiotherapy relies on obtaining a volumetric image of the patient in the treatment setup to verify that the target is positioned correctly and nearby organs are safe. Cone-beam CT is integrated into many linear accelerators and provides a 3D image of the patient in the exact treatment position. By comparing this CBCT image to the planning CT, clinicians can make precise couch shifts or adjustments before delivering each fraction, ensuring accurate targeting and protection of healthy tissue.

PET-CT and MRI are diagnostic/imaging modalities used for planning or staging and are not routinely employed for every-treatment-fraction alignment. Ultrasound is used in some centers for specific sites, but it is not as universally reliable or integrated for daily 3D alignment verification as cone-beam CT.

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