Simulation study on coverage of tumor motion accordance with the scanning time in slow-scan CT

Chun Joo Park, Sung Ho Park, Jungwon Kwak, Eun Kyung Choi, Jong Hoon Kim, Sang Wook Lee, Si Yeol Song, Sang Min Yoon, Seung Do Ahn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Slow scan CT (SSCT) has been utilized for radiation treatment planning based on the assumption that coverage of full tumor motion during scanning time would yield a reasonable output in determining internal target volume (ITV) margin. However, inconsistency in projection data due to the motion would result severe distortion in reconstructed image and therefore, careful precaution must be taken. In this study, we have simulated and evaluated the effect of tumor motion on reconstructed image of SSCT with different respiratory durations. Projection data was generated through ray tracing forward projection method assuming that tumor sphere oscillates vertically with sine function at single respiratory duration. Measurement of projection data was taken by full coverage of respiratory duration from single to ten. Evaluation was done with calculating percentage radial deviation at the trajectory of tumor motion. Results have shown that at least three times of duration coverage during the scan time is necessary to represent ITV close to that in ideal. The findings of this study have shown that careful precaution on motion coverage must be taken before acquiring appropriate ITV margin of SSCT.

Original languageEnglish (US)
Title of host publicationWorld Congress on Medical Physics and Biomedical Engineering
Subtitle of host publicationRadiation Oncology
PublisherSpringer Verlag
Pages970-972
Number of pages3
Edition1
ISBN (Print)9783642034725
DOIs
StatePublished - 2009
EventWorld Congress on Medical Physics and Biomedical Engineering: Radiation Oncology - Munich, Germany
Duration: Sep 7 2009Sep 12 2009

Publication series

NameIFMBE Proceedings
Number1
Volume25
ISSN (Print)1680-0737

Other

OtherWorld Congress on Medical Physics and Biomedical Engineering: Radiation Oncology
CountryGermany
CityMunich
Period9/7/099/12/09

Keywords

  • Radiation treatment planning
  • Slow-scan CT
  • Tumor motion artifact

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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