Organ Motion during Beam Delivery Detected by CyberKnife System in Stereotactic Body Radiation Therapy
Keywords:
Stereotactic body radiation therapy, CyberKnife, Organ motionAbstract
Purpose: To evaluate organ motion detected by CyberKnife system during Stereotactic Body Radiation Therapy (SBRT) and to study the factors affecting errors during SBRT by the CyberKnife system
Materials and Methods: 31 patients (41 lesions, total 174 fractions) with lung, upper abdominal, lower abdominal or spine tumors were treated with CyberKnife system. Errors in all 6 directions were recorded in the system in graph form. Errors that exceeded the threshold limit of the system were recorded in our data collection form.
Results: Spine and rectum patients had median maximum delta error of 1.5-2.5 mm and median maximum error in all 3 rotational directions of 1-2 degree. Lung, liver, prostate and cervix patients had median maximum delta error of 3.0-3.8 mm and median maximum error in some rotational directions in excess of 5 degree except in cervix patients.
Conclusion: The spinal and rectal patients had lower magnitude of error than the lung, liver, prostate and cervix patients. The data of median of maximum movement in each axis of each organ group might be beneficial in determining the safety margin for organ motion in treating cancer of that organ group.
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