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Title: A Pelvic Phantom for Modeling Internal Organ Motions

Abstract

A pelvic phantom was developed for use in testing image-guided radiation therapy (IGRT) and adaptive applications in radiation therapy (ART) with simulating the anterior-posterior internal organ motions during prostate radiotherapy. Measurements could be done with an ionization chamber (IC) in the simulated prostate. The rectum was simulated by air-equivalent material (AEM). The volume superior to the IC placement was considered as the bladder. The extension of AEM volume could be varied. The vertical position of the IC placement could be shifted by {+-}1 cm to simulate the prostate motion parallel to the changes in bladder volume. The reality of the simulation was inspected. Three-millimeter-slice-increment computed tomography (CT) scans were taken for irradiation planning. The structure set was adapted to the phantom from a treated patient. Planning target volume was delineated according to the RTOG 0126 study. IMRT and 3D conformal radiation therapy (3D-CRT) plans were made. Prostate motion and rectum volume changes were simulated in the phantom. IC displacement was corrected by phantom shifting. The delivered dose was measured with IC in 7 cases using intensity-modulated radiation therapy (IMRT) and 3D-CRT fractions, and single square-shaped beams: anteroposterior (AP), posteroanterior (PA), and lateral (LAT). Variations from the calculated doses were slightlymore » below 1% at IMRT and around 1% at 3D-CRT; below 4.5% at square AP beam; up to 9% at square PA beam; and around 0.5% at square LAT beam. Other authors have already shown that by using planning systems and ultrasonic and cone beam CT guidance, correction of organ motions in a real patient during prostate cancer IGRT does not have a significant dosimetric effect. The inspection of our phantom-as described here-ended with similar results. Our team suggested that our model is sufficiently realistic and can be used for IGRT and ART testing.« less

Authors:
 [1]; ; ; ; ;  [1];  [2];  [3];  [1]
  1. Institute of Oncotherapy, University of Pecs, Pecs (Hungary)
  2. Oncotherapy Clinic, University of Szeged, Szeged (Hungary)
  3. Department of Radiology, University of Pecs, Pecs (Hungary)
Publication Date:
OSTI Identifier:
21590477
Resource Type:
Journal Article
Journal Name:
Medical Dosimetry
Additional Journal Information:
Journal Volume: 36; Journal Issue: 3; Other Information: DOI: 10.1016/j.meddos.2010.04.002; PII: S0958-3947(10)00063-4; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0958-3947
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; BLADDER; CAT SCANNING; DOSIMETRY; IRRADIATION; NEOPLASMS; PHANTOMS; PROSTATE; RADIATION DOSES; RADIOTHERAPY; RECTUM; SIMULATION; BODY; COMPUTERIZED TOMOGRAPHY; DIAGNOSTIC TECHNIQUES; DIGESTIVE SYSTEM; DISEASES; DOSES; GASTROINTESTINAL TRACT; GLANDS; INTESTINES; LARGE INTESTINE; MALE GENITALS; MEDICINE; MOCKUP; NUCLEAR MEDICINE; ORGANS; RADIOLOGY; STRUCTURAL MODELS; THERAPY; TOMOGRAPHY; URINARY TRACT

Citation Formats

Kovacs, Peter, E-mail: peter.kovacs@aok.pte.hu, Sebestyen, Zsolt, Farkas, Robert, Bellyei, Szabolcs, Szigeti, Andras, Liposits, Gabor, Hideghety, Katalin, Derczy, Katalin, and Mangel, Laszlo. A Pelvic Phantom for Modeling Internal Organ Motions. United States: N. p., 2011. Web. doi:10.1016/j.meddos.2010.04.002.
Kovacs, Peter, E-mail: peter.kovacs@aok.pte.hu, Sebestyen, Zsolt, Farkas, Robert, Bellyei, Szabolcs, Szigeti, Andras, Liposits, Gabor, Hideghety, Katalin, Derczy, Katalin, & Mangel, Laszlo. A Pelvic Phantom for Modeling Internal Organ Motions. United States. doi:10.1016/j.meddos.2010.04.002.
Kovacs, Peter, E-mail: peter.kovacs@aok.pte.hu, Sebestyen, Zsolt, Farkas, Robert, Bellyei, Szabolcs, Szigeti, Andras, Liposits, Gabor, Hideghety, Katalin, Derczy, Katalin, and Mangel, Laszlo. Sat . "A Pelvic Phantom for Modeling Internal Organ Motions". United States. doi:10.1016/j.meddos.2010.04.002.
@article{osti_21590477,
title = {A Pelvic Phantom for Modeling Internal Organ Motions},
author = {Kovacs, Peter, E-mail: peter.kovacs@aok.pte.hu and Sebestyen, Zsolt and Farkas, Robert and Bellyei, Szabolcs and Szigeti, Andras and Liposits, Gabor and Hideghety, Katalin and Derczy, Katalin and Mangel, Laszlo},
abstractNote = {A pelvic phantom was developed for use in testing image-guided radiation therapy (IGRT) and adaptive applications in radiation therapy (ART) with simulating the anterior-posterior internal organ motions during prostate radiotherapy. Measurements could be done with an ionization chamber (IC) in the simulated prostate. The rectum was simulated by air-equivalent material (AEM). The volume superior to the IC placement was considered as the bladder. The extension of AEM volume could be varied. The vertical position of the IC placement could be shifted by {+-}1 cm to simulate the prostate motion parallel to the changes in bladder volume. The reality of the simulation was inspected. Three-millimeter-slice-increment computed tomography (CT) scans were taken for irradiation planning. The structure set was adapted to the phantom from a treated patient. Planning target volume was delineated according to the RTOG 0126 study. IMRT and 3D conformal radiation therapy (3D-CRT) plans were made. Prostate motion and rectum volume changes were simulated in the phantom. IC displacement was corrected by phantom shifting. The delivered dose was measured with IC in 7 cases using intensity-modulated radiation therapy (IMRT) and 3D-CRT fractions, and single square-shaped beams: anteroposterior (AP), posteroanterior (PA), and lateral (LAT). Variations from the calculated doses were slightly below 1% at IMRT and around 1% at 3D-CRT; below 4.5% at square AP beam; up to 9% at square PA beam; and around 0.5% at square LAT beam. Other authors have already shown that by using planning systems and ultrasonic and cone beam CT guidance, correction of organ motions in a real patient during prostate cancer IGRT does not have a significant dosimetric effect. The inspection of our phantom-as described here-ended with similar results. Our team suggested that our model is sufficiently realistic and can be used for IGRT and ART testing.},
doi = {10.1016/j.meddos.2010.04.002},
journal = {Medical Dosimetry},
issn = {0958-3947},
number = 3,
volume = 36,
place = {United States},
year = {2011},
month = {10}
}