title: Dose verification in intensity modulation radiation therapy: a fractal dimension characteristics study.
abstract: OBJECTIVE
  This study describes how to identify the coincidence of desired planning isodose curves with film experimental results by using a mathematical fractal dimension characteristic method to avoid the errors caused by visual inspection in the intensity modulation radiation therapy (IMRT).
  
  
  METHODS
  The isodose curves of the films delivered by linear accelerator according to Plato treatment planning system were acquired using Osiris software to aim directly at a single interested dose curve for fractal characteristic analysis. The results were compared with the corresponding planning desired isodose curves for fractal dimension analysis in order to determine the acceptable confidence level between the planning and the measurement.
  
  
  RESULTS
  The film measured isodose curves and computer planning curves were deemed identical in dose distribution if their fractal dimensions are within some criteria which suggested that the fractal dimension is a unique fingerprint of a curve in checking the planning and film measurement results. The dose measured results of the film were presumed to be the same if their fractal dimension was within 1%.
  
  
  CONCLUSIONS
  This quantitative rather than qualitative comparison done by fractal dimension numerical analysis helps to decrease the quality assurance errors in IMRT dosimetry verification.
authors: Department of Information Engineering, I-Shou University, No. 1, Sec. 1, Syuecheng Road, Dashu District, Kaohsiung City 84001, Taiwan.
authors: Jia-Ming
authors: JM
authors: Wu
authors: Chung-Ming
authors: CM
authors: Kuo
authors: Ching-Jiang
authors: CJ
authors: Chen
mesh_terms: D000465:Algorithms; D017709:Fractals; D006801:Humans; D008297:Male; D011471:Prostatic Neoplasms / Q000473:pathology / Q000532:radiotherapy*; D011829:Radiation Dosage; D011874:Radiometry; D012984:Software
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