A New Approach to Reduce Number of Split Fields in Large Field IMRT

Chen Chiao Lee, Andrew Wu, Madhur Garg, Subhakar Mutyala, Shalom Kalnicki, Gary Sayed, Dennis Mah

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Intensity-modulated radiation therapy (IMRT) has been applied for treatments of primary head with neck nodes, lung with supraclavicular nodes, and high-risk prostate cancer with pelvis wall nodes, all of which require large fields. However, the design of the Varian multileaf collimator requires fields >14 cm in width to be split into 2 or more carriage movements. With the split-field technique, both the number of monitor units (MUs) and total treatment time are significantly increased. Although many different approaches have been investigated to reduce the MU, including introducing new leaf segmentation algorithms, none have resulted in widespread success. In addition, for most clinics, writing such algorithms is not a feasible solution, particularly with commercial treatment planning systems. We introduce a new approach that can minimize the number of split fields and reduce the total MUs, thereby reducing treatment time. The technique is demonstrated on the Eclipse planning system V7.3, but could be generalized to any other system.

Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
JournalMedical Dosimetry
Issue number1
StatePublished - 2011


  • Large PTV
  • Large-field IMRT
  • Split fields

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Oncology
  • Radiology Nuclear Medicine and imaging


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