open access

Vol 24, No 2 (2019)
Published online: 2019-03-01
Submitted: 2018-04-19
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Effect of image quality on correlation modeling error using a fiducial marker in a gimbaled linear accelerator

Hideharu Miura, Shuichi Ozawa, Tsubasa Enosaki, Fumika Hosono, Kiyoshi Yamada, Yasushi Nagata
DOI: 10.1016/j.rpor.2018.12.003
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Rep Pract Oncol Radiother 2019;24(2):233-238.

open access

Vol 24, No 2 (2019)
Published online: 2019-03-01
Submitted: 2018-04-19

Abstract

The purpose of this study was to investigate the effect of image quality under various imaging parameters (60, 70, 80, 90, 100, 110, and 120kV at 200mA and 10ms/63, 80, 100, 160, 200, 250, and 320mA at 120kV and 10ms) and the diameter of the fiducial marker (0.25, 0.50, 0.75, and 1.10mm) on the correlation modeling error for dynamic tumor tracking (DTT) in the Vero4DRT system. Each fiducial marker was inserted into the center of the 30×30×10cm3 water-equivalent phantom. A programmable respiratory motion table was used to simulate breathing-induced organ motion, with an amplitude of ±20mm and a breathing cycle of 4s. The correlation modeling error was calculated from the absolute difference between the detected and predicted target positions in the cranio-caudal direction. The image contrast of the fiducial marker was enhanced with increasing kV and mA. Increasing the diameter of the fiducial marker also enhanced the image contrast. Correlation-modeling error does not depend on the image quality and fiducial marker diameter. A lower kV setting did not generate a 4D model due to poor image contrast. All fiducial marker diameters were identified as good candidates for DTT in the Vero4DRT system.

Abstract

The purpose of this study was to investigate the effect of image quality under various imaging parameters (60, 70, 80, 90, 100, 110, and 120kV at 200mA and 10ms/63, 80, 100, 160, 200, 250, and 320mA at 120kV and 10ms) and the diameter of the fiducial marker (0.25, 0.50, 0.75, and 1.10mm) on the correlation modeling error for dynamic tumor tracking (DTT) in the Vero4DRT system. Each fiducial marker was inserted into the center of the 30×30×10cm3 water-equivalent phantom. A programmable respiratory motion table was used to simulate breathing-induced organ motion, with an amplitude of ±20mm and a breathing cycle of 4s. The correlation modeling error was calculated from the absolute difference between the detected and predicted target positions in the cranio-caudal direction. The image contrast of the fiducial marker was enhanced with increasing kV and mA. Increasing the diameter of the fiducial marker also enhanced the image contrast. Correlation-modeling error does not depend on the image quality and fiducial marker diameter. A lower kV setting did not generate a 4D model due to poor image contrast. All fiducial marker diameters were identified as good candidates for DTT in the Vero4DRT system.

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Keywords

Fiducial marker; Image contrast; Dynamic tumor tracking; Vero4DRT; Correlation-modeling error

About this article
Title

Effect of image quality on correlation modeling error using a fiducial marker in a gimbaled linear accelerator

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 24, No 2 (2019)

Pages

233-238

Published online

2019-03-01

DOI

10.1016/j.rpor.2018.12.003

Bibliographic record

Rep Pract Oncol Radiother 2019;24(2):233-238.

Keywords

Fiducial marker
Image contrast
Dynamic tumor tracking
Vero4DRT
Correlation-modeling error

Authors

Hideharu Miura
Shuichi Ozawa
Tsubasa Enosaki
Fumika Hosono
Kiyoshi Yamada
Yasushi Nagata

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