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Spiral computed tomography phase-space source model in the BEAMnrc/EGSnrc Monte Carlo system: implementation and validation.

Publication ,  Journal Article
Kim, S; Yoshizumi, TT; Yin, F-F; Chetty, IJ
Published in: Phys Med Biol
April 21, 2013

Currently, the BEAMnrc/EGSnrc Monte Carlo (MC) system does not provide a spiral CT source model for the simulation of spiral CT scanning. We developed and validated a spiral CT phase-space source model in the BEAMnrc/EGSnrc system. The spiral phase-space source model was implemented in the DOSXYZnrc user code of the BEAMnrc/EGSnrc system by analyzing the geometry of spiral CT scan-scan range, initial angle, rotational direction, pitch, slice thickness, etc. Table movement was simulated by changing the coordinates of the isocenter as a function of beam angles. Some parameters such as pitch, slice thickness and translation per rotation were also incorporated into the model to make the new phase-space source model, designed specifically for spiral CT scan simulations. The source model was hard-coded by modifying the 'ISource = 8: Phase-Space Source Incident from Multiple Directions' in the srcxyznrc.mortran and dosxyznrc.mortran files in the DOSXYZnrc user code. In order to verify the implementation, spiral CT scans were simulated in a CT dose index phantom using the validated x-ray tube model of a commercial CT simulator for both the original multi-direction source (ISOURCE = 8) and the new phase-space source model in the DOSXYZnrc system. Then the acquired 2D and 3D dose distributions were analyzed with respect to the input parameters for various pitch values. In addition, surface-dose profiles were also measured for a patient CT scan protocol using radiochromic film and were compared with the MC simulations. The new phase-space source model was found to simulate the spiral CT scanning in a single simulation run accurately. It also produced the equivalent dose distribution of the ISOURCE = 8 model for the same CT scan parameters. The MC-simulated surface profiles were well matched to the film measurement overall within 10%. The new spiral CT phase-space source model was implemented in the BEAMnrc/EGSnrc system. This work will be beneficial in estimating the spiral CT scan dose in the BEAMnrc/EGSnrc system.

Duke Scholars

Published In

Phys Med Biol

DOI

EISSN

1361-6560

Publication Date

April 21, 2013

Volume

58

Issue

8

Start / End Page

2609 / 2624

Location

England

Related Subject Headings

  • Tomography, Spiral Computed
  • Nuclear Medicine & Medical Imaging
  • Monte Carlo Method
  • Models, Theoretical
  • Film Dosimetry
  • 5105 Medical and biological physics
  • 1103 Clinical Sciences
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Kim, S., Yoshizumi, T. T., Yin, F.-F., & Chetty, I. J. (2013). Spiral computed tomography phase-space source model in the BEAMnrc/EGSnrc Monte Carlo system: implementation and validation. Phys Med Biol, 58(8), 2609–2624. https://doi.org/10.1088/0031-9155/58/8/2609
Kim, Sangroh, Terry T. Yoshizumi, Fang-Fang Yin, and Indrin J. Chetty. “Spiral computed tomography phase-space source model in the BEAMnrc/EGSnrc Monte Carlo system: implementation and validation.Phys Med Biol 58, no. 8 (April 21, 2013): 2609–24. https://doi.org/10.1088/0031-9155/58/8/2609.
Kim S, Yoshizumi TT, Yin F-F, Chetty IJ. Spiral computed tomography phase-space source model in the BEAMnrc/EGSnrc Monte Carlo system: implementation and validation. Phys Med Biol. 2013 Apr 21;58(8):2609–24.
Kim, Sangroh, et al. “Spiral computed tomography phase-space source model in the BEAMnrc/EGSnrc Monte Carlo system: implementation and validation.Phys Med Biol, vol. 58, no. 8, Apr. 2013, pp. 2609–24. Pubmed, doi:10.1088/0031-9155/58/8/2609.
Kim S, Yoshizumi TT, Yin F-F, Chetty IJ. Spiral computed tomography phase-space source model in the BEAMnrc/EGSnrc Monte Carlo system: implementation and validation. Phys Med Biol. 2013 Apr 21;58(8):2609–2624.
Journal cover image

Published In

Phys Med Biol

DOI

EISSN

1361-6560

Publication Date

April 21, 2013

Volume

58

Issue

8

Start / End Page

2609 / 2624

Location

England

Related Subject Headings

  • Tomography, Spiral Computed
  • Nuclear Medicine & Medical Imaging
  • Monte Carlo Method
  • Models, Theoretical
  • Film Dosimetry
  • 5105 Medical and biological physics
  • 1103 Clinical Sciences
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences