SU-E-J-131: Implement a Passive Breath Gating Equipment for Gated CBCT Imaging: A Feasibility Study

Medical Physics
Weigang HuZhen Zhang

Abstract

To investigate the feasibility of using a patient passive breath gating (PBG) equipment in kilo-voltage cone-beam CT (kVCBCT) image acquisition to reduce the respiratory induced motion artifacts for image-guided radiotherapy. A PBG equipment developed in our department was used to passively block patient's breathing. Assisted by this device, patients were able to hold their breaths for 15-25 seconds. An infrared block was placed on the patient's body and the breath-hold was triggered by the signal from the Varian RPM system. Three sets of kVCBCT images were acquired using the same imaging parameters with the OBI system on Varian Trilogy for a gastric cancer patient: free breathing (FB), with two-breath-hold (BH1) and three-breath-hold (BH2). Patient was allowed to breathe normally for 5-10s between breath-hold. A planning CT was obtained with one breath-hold on a conventional 4D CT scanner. The diaphragm position on FB, BH1 and BH2 CBCT images was compared with its position on the planning CT to assess the motion artifacts. The acquisition time for each of the three kVCBCTs was 60 seconds. The patient tolerated the breath-hold CBCT scanning well. Severe image blurriness and streak artifacts caused by respiratory motion were obs...Continue Reading

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