Dosimetric and radiobiological comparison of Cyberknife and Tomotherapy in stereotactic body radiotherapy for localized prostate cancer

Chun You Chen, Liang Ming Lee, Hsiao Wei Yu, Steve P. Lee, Hsin Lun Lee, Yung Wei Lin, Yu Ching Wen, Yi Ju Chen, Chiu Ping Chen, Jo Ting Tsai

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

BACKGROUND AND PURPOSE: As recent studies have suggested relatively low α/β for prostate cancer, the interest in hypofractionated stereotactic body radiotherapy (SBRT) for prostate cancer is rising. The aim of this study is to compare dosimetric results of Cyberknife (CK) with Tomotherapy (HT) in SBRT for localized prostate cancer. Furthermore, the radiobiologic consequences of heterogeneous dose distribution are also analyzed. MATERIAL AND METHOD: A total of 12 cases of localized prostate cancer previously treated with SBRT were collected. Treatments had been planned and delivered using CK. Then HT plans were generated for comparison afterwards. The prescribed dose was 37.5Gy in 5 fractions. Dosimetric indices for target volumes and organs at risk (OAR) were compared. For radiobiological evaluation, generalized equivalent uniform dose (gEUD) and normal tissue complication probability (NTCP) were calculated and compared. RESULT: Both CK and HT achieved target coverage while meeting OAR constraints adequately. HT plans resulted in better dose homogeneity (Homogeneity index: 1.04±0.01 vs. 1.21±0.01; p = 0.0022), target coverage (97.74±0.86 vs. 96.56±1.17; p = 0.0076) and conformity (new vonformity index: 1.16±0.05 vs. 1.21±0.04; p = 0.0096). HT was shown to predict lower late rectal toxicity as compared to CK. Integral dose to body was also significantly lower in HT plans (46.59±6.44 Gy'L vs 57.05±11.68 Gy'L; p = 0.0029). CONCLUSION: Based on physical dosimetry and radiobiologic considerations, HT may have advantages over CK, specifically in rectal sparing which could translate into clinical benefit of decreased late toxicities.

Original languageEnglish
Pages (from-to)465-477
Number of pages13
JournalJournal of X-Ray Science and Technology
Volume25
Issue number3
DOIs
Publication statusPublished - 2017

Fingerprint

Radiosurgery
Radiotherapy
radiation therapy
Prostatic Neoplasms
cancer
Organs at Risk
dosage
Toxicity
toxicity
organs
homogeneity
Dosimetry
Tissue
dosimeters
evaluation
Therapeutics

Keywords

  • cyberknife
  • equivalent uniform dose (EUD)
  • normal tissue complication probability (NTCP)
  • prostate cancer
  • Stereotactic body radiation therapy (SBRT)
  • tomotherapy

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Radiology Nuclear Medicine and imaging
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Dosimetric and radiobiological comparison of Cyberknife and Tomotherapy in stereotactic body radiotherapy for localized prostate cancer. / Chen, Chun You; Lee, Liang Ming; Yu, Hsiao Wei; Lee, Steve P.; Lee, Hsin Lun; Lin, Yung Wei; Wen, Yu Ching; Chen, Yi Ju; Chen, Chiu Ping; Tsai, Jo Ting.

In: Journal of X-Ray Science and Technology, Vol. 25, No. 3, 2017, p. 465-477.

Research output: Contribution to journalArticle

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AU - Lee, Steve P.

AU - Lee, Hsin Lun

AU - Lin, Yung Wei

AU - Wen, Yu Ching

AU - Chen, Yi Ju

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AU - Tsai, Jo Ting

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