Study of ExacTrac X-ray 6D IGRT setup uncertainty for marker-based prostate IMRT treatment.

Journal of Applied Clinical Medical Physics
Chengyu ShiChristopher Iannuzzi

Abstract

Novalis Tx ExacTrac X-ray system has the 6D adjustment ability for patient setup. Limited studies exist about the setup uncertainty with ExacTrac X-ray system for IMRT prostate treatment with fiducial markers implanted. The purpose of this study is to investigate the marker-based prostate IMRT treatment setup uncertainty using ExacTrac 6D IGRT ability for patient setup. Forty-three patients with prostate cancers and markers implanted have been treated on the Novalis Tx machine. The ExacTrac X-ray system has been used for the patient pretreatment setup and intratreatment verification. In total, the shifts data for 1261 fractions and 3504 correction times (the numbers of X-ray images were taken from tube 1 and tube 2) have been analyzed. The setup uncertainty has been separated into uncertainties in 6D. Marker matching uncertainty was also analyzed. Correction frequency probability density function was plotted, and the radiation dose for imaging was calculated. The minimum, average, and maximum translation shifts were: -5.12 ± 3.89 mm, 0.20 ± 2.21 mm, and 6.07 ± 4.44 mm, respectively, in the lateral direction; -6.80 ± 3.21 mm, -1.09 ± 2.21 mm, and 3.12 ± 2.62 mm, respectively, in the longitudinal direction; and -7.33 ± 3.46 mm, -...Continue Reading

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Citations

Dec 5, 2014·Medical Physics·Andrew H BelcherRodney D Wiersma
Nov 22, 2017·Journal of Applied Clinical Medical Physics·Kyle WoodsNilendu Gupta
Apr 14, 2016·Journal of Applied Clinical Medical Physics·Margie A HuntPengpeng Zhang
Sep 19, 2020·The Cancer Journal·Michael DohopolskiAurelie Garant
Oct 7, 2020·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Guoping ShanC-M Charlie Ma

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Methods Mentioned

BETA
X‐ray

Software Mentioned

Eclipse station
BrainLAB ExacTrac
Novalis
BrainLAB
ExacTrac
Visicoil

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