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Evaluation of integrated respiratory gating systems on a Novalis Tx system.

Publication ,  Journal Article
Chang, Z; Liu, T; Cai, J; Chen, Q; Wang, Z; Yin, F-F
Published in: J Appl Clin Med Phys
April 4, 2011

The purpose of this study was to investigate the accuracy of motion tracking and radiation delivery control of integrated gating systems on a Novalis Tx system. The study was performed on a Novalis Tx system, which is equipped with Varian Real-time Position Management (RPM) system, and BrainLAB ExacTrac gating systems. In this study, the two systems were assessed on accuracy of both motion tracking and radiation delivery control. To evaluate motion tracking, two artificial motion profiles and five patients' respiratory profiles were used. The motion trajectories acquired by the two gating systems were compared against the references. To assess radiation delivery control, time delays were measured using a single-exposure method. More specifically, radiation is delivered with a 4 mm diameter cone within the phase range of 10%-45% for the BrainLAB ExacTrac system, and within the phase range of 0%-25% for the Varian RPM system during expiration, each for three times. Radiochromic films were used to record the radiation exposures and to calculate the time delays. In the work, the discrepancies were quantified using the parameters of mean and standard deviation (SD). Pearson's product-moment correlational analysis was used to test correlation of the data, which is quantified using a parameter of r. The trajectory profiles acquired by the gating systems show good agreement with those reference profiles. A quantitative analysis shows that the average mean discrepancies between BrainLAB ExacTrac system and known references are 1.5 mm and 1.9 mm for artificial and patient profiles, with the maximum motion amplitude of 28.0 mm. As for the Varian RPM system, the corresponding average mean discrepancies are 1.1 mm and 1.7 mm for artificial and patient profiles. With the proposed single-exposure method, the time delays are found to be 0.20 ± 0.03 seconds and 0.09 ± 0.01 seconds for BrainLAB ExacTrac and Varian RPM systems, respectively. The results indicate the systems can track motion and control radiation delivery with reasonable accuracy. The proposed single-exposure method has been demonstrated to be feasible in measuring time delay efficiently.

Duke Scholars

Published In

J Appl Clin Med Phys

DOI

EISSN

1526-9914

Publication Date

April 4, 2011

Volume

12

Issue

3

Start / End Page

3495

Location

United States

Related Subject Headings

  • Time Factors
  • Respiratory-Gated Imaging Techniques
  • Respiratory Mechanics
  • Radiotherapy, Intensity-Modulated
  • Radiographic Image Interpretation, Computer-Assisted
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Motion
  • Linear Models
  • Humans
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Chang, Z., Liu, T., Cai, J., Chen, Q., Wang, Z., & Yin, F.-F. (2011). Evaluation of integrated respiratory gating systems on a Novalis Tx system. J Appl Clin Med Phys, 12(3), 3495. https://doi.org/10.1120/jacmp.v12i3.3495
Chang, Zheng, Tonghai Liu, Jing Cai, Qing Chen, Zhiheng Wang, and Fang-Fang Yin. “Evaluation of integrated respiratory gating systems on a Novalis Tx system.J Appl Clin Med Phys 12, no. 3 (April 4, 2011): 3495. https://doi.org/10.1120/jacmp.v12i3.3495.
Chang Z, Liu T, Cai J, Chen Q, Wang Z, Yin F-F. Evaluation of integrated respiratory gating systems on a Novalis Tx system. J Appl Clin Med Phys. 2011 Apr 4;12(3):3495.
Chang, Zheng, et al. “Evaluation of integrated respiratory gating systems on a Novalis Tx system.J Appl Clin Med Phys, vol. 12, no. 3, Apr. 2011, p. 3495. Pubmed, doi:10.1120/jacmp.v12i3.3495.
Chang Z, Liu T, Cai J, Chen Q, Wang Z, Yin F-F. Evaluation of integrated respiratory gating systems on a Novalis Tx system. J Appl Clin Med Phys. 2011 Apr 4;12(3):3495.

Published In

J Appl Clin Med Phys

DOI

EISSN

1526-9914

Publication Date

April 4, 2011

Volume

12

Issue

3

Start / End Page

3495

Location

United States

Related Subject Headings

  • Time Factors
  • Respiratory-Gated Imaging Techniques
  • Respiratory Mechanics
  • Radiotherapy, Intensity-Modulated
  • Radiographic Image Interpretation, Computer-Assisted
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Motion
  • Linear Models
  • Humans