Dosimetric characteristics of Novalis Tx system with high definition multileaf collimator

Zheng Chang, Zhiheng Wang, Q. Jackie Wu, Hui Yan, Jim Bowsher, Junan Zhang, Fang Fang Yin

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


A new Novalis Tx system equipped with a high definition multileaf collimator (HDMLC) recently became available to perform both image-guided radiosurgery and conventional radiotherapy. It is capable of delivering a highly conformal radiation dose with three energy modes: 6 MV photon energy, 15 MV photon energy, and 6 MV photon energy in a stereotactic radiosurgery mode with 1000 MUmin dose rate. Dosimetric characteristics of the new Novalis Tx treatment unit with the HDMLC are systematically measured for commissioning. A high resolution diode detector and miniion-chamber detector are used to measure dosimetric data for a range of field sizes from 4×4 mm to 400×400 mm. The commissioned Novalis Tx system has passed the RPC stereotactic radiosurgery head phantom irradiation test. The Novalis Tx system not only expands its capabilities with three energy modes, but also achieves better beam conformity and sharer beam penumbra with HDMLC. Since there is little beam data information available for the new Novalis Tx system, we present in this work the dosimetric data of the new modality for reference and comparison.

Original languageEnglish (US)
Pages (from-to)4460-4463
Number of pages4
JournalMedical Physics
Issue number10
StatePublished - 2008
Externally publishedYes


  • High definition multileaf collimator
  • Novalis Tx system
  • Radiosurgery

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging


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