Nuclear Medicine & Radiation Therapy

Chee-Wai Cheng

Publications

• Research Article
  Predicting Isocenter Shift due to Prostate Motion and Selecting Patient Specific Posterior Margin for IGRT of Prostate
  Author(s): Chee-Wai Cheng, Zhanrong Gao, Brandon Langley, Scott Merrick and James WongChee-Wai Cheng, Zhanrong Gao, Brandon Langley, Scott Merrick and James Wong
  
  Purposes/Objective: Image-Guided Radiation Therapy has been shown to significantly decrease setup errors and correct for organ motions (by patient repositioning, referred to as shift here), thus allowing the use of a tight treatment margin. The objective of the present work is to show that our evidenced-based patient positioning technique (isocenter shift) can effectively reduce the overall setup error for the majority of prostate patients. Methods and Materials: We reviewed and analyzed the pre-treatment CT scans of 87 prostate patients treated from 2005-2007. Each patient received 10-15 image-guided fractions in the first phase of the treatment course. By systematically analyzed the imaging data and comparing to the planning CT, the isocenter positioning in both the left-right and anterior-posterior directions in the second phase of the trea.. Read More»
  DOI: 10.4172/2155-9619.S3-001

  Abstract PDF