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Planning design of locally advanced pancreatic carcinoma using 4DCT and IMRT/IGRT technologies

Abstract

Background and purpose. To study the impact of the 4DCT imaging technique on radiotherapy planning for pancreatic carcinoma. To evaluate the possibility of IMRT/IGRT to increase the dose to PTV subvolume. Material and methods. Contrast-enhanced 4DCT scans of 15 patients (PTs) with unresectable pancreatic cancer were acquired. A 4DCT based PTV (4D-PTV) was created by the convolution of contours and then expanded for geometric uncertainties; a standard PTV (STD-PTV) was derived from a single CTV plus conventional margins. Two 3D conformal treatment (3DCRT) plans and one Helical Tomotherapy (HT) plan were generated with a prescription of 60 Gy. Regarding the 3DCRT plans, the 4D-PTV was considered as the target volume for one, and the STD-PTV for the other; the HT plans were performed only for 4D-PTV. Twelve of 15 PTs were admitted to a Phase I hypofractionated study (15 fractions). The prescribed dose was 44.25 Gy to the 4D-PTV and the PTV subvolume around vascular involvement was boosted from 50 to 55 Gy; before treatment, daily patient position was corrected using MVCT. Results. 4D-PTVs were smaller than STD-PTVs with a volume reduction equal to 37%. 3DCRT plans on 4D-PTV showed a significant sparing of most OARs, the use of IMRT  More>>
Authors:
Sangalli, Giulia; Cattaneo, Giovanni M; Broggi, Sara; Calandrino, Riccardo; [1]  Passoni, Paolo; Slim, Najla; Muzio, Nadia Di; [2]  Reni, Michele; [3]  Bettinardi, Valentino [4] 
  1. Medical Physics Dept., San Raffaele Scientific Inst., Milan (Italy)
  2. Radiotherapy Dept., San Raffaele Scientific Inst., Milan (Italy)
  3. Oncology DPT, San Raffaele Scientific Inst., Milan (Italy)
  4. Nuclear Medicine DPT, San Raffaele Scientific Inst., Milan (Italy)
Publication Date:
Jan 15, 2011
Product Type:
Journal Article
Resource Relation:
Journal Name: Acta Oncologica (Stockholm) (online); Journal Volume: 50; Journal Issue: 1; Other Information: 10.3109/0284186X.2010.484425
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; RADIOTHERAPY; NEOPLASMS; FOUR-DIMENSIONAL CALCULATIONS; PANCREAS; CARCINOMAS; COMPUTERIZED TOMOGRAPHY
OSTI ID:
1004330
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1651-226X; TRN: SE1108026
Availability:
Available from DOI: http://dx.doi.org/10.3109/0284186X.2010.484425
Submitting Site:
SWDN
Size:
page(s) 72-80
Announcement Date:
Feb 07, 2011

Citation Formats

Sangalli, Giulia, Cattaneo, Giovanni M, Broggi, Sara, Calandrino, Riccardo, Passoni, Paolo, Slim, Najla, Muzio, Nadia Di, Reni, Michele, and Bettinardi, Valentino. Planning design of locally advanced pancreatic carcinoma using 4DCT and IMRT/IGRT technologies. Sweden: N. p., 2011. Web. doi:10.3109/0284186X.2010.484425.
Sangalli, Giulia, Cattaneo, Giovanni M, Broggi, Sara, Calandrino, Riccardo, Passoni, Paolo, Slim, Najla, Muzio, Nadia Di, Reni, Michele, & Bettinardi, Valentino. Planning design of locally advanced pancreatic carcinoma using 4DCT and IMRT/IGRT technologies. Sweden. doi:10.3109/0284186X.2010.484425.
Sangalli, Giulia, Cattaneo, Giovanni M, Broggi, Sara, Calandrino, Riccardo, Passoni, Paolo, Slim, Najla, Muzio, Nadia Di, Reni, Michele, and Bettinardi, Valentino. 2011. "Planning design of locally advanced pancreatic carcinoma using 4DCT and IMRT/IGRT technologies." Sweden. doi:10.3109/0284186X.2010.484425. https://www.osti.gov/servlets/purl/10.3109/0284186X.2010.484425.
@misc{etde_1004330,
title = {Planning design of locally advanced pancreatic carcinoma using 4DCT and IMRT/IGRT technologies}
author = {Sangalli, Giulia, Cattaneo, Giovanni M, Broggi, Sara, Calandrino, Riccardo, Passoni, Paolo, Slim, Najla, Muzio, Nadia Di, Reni, Michele, and Bettinardi, Valentino}
abstractNote = {Background and purpose. To study the impact of the 4DCT imaging technique on radiotherapy planning for pancreatic carcinoma. To evaluate the possibility of IMRT/IGRT to increase the dose to PTV subvolume. Material and methods. Contrast-enhanced 4DCT scans of 15 patients (PTs) with unresectable pancreatic cancer were acquired. A 4DCT based PTV (4D-PTV) was created by the convolution of contours and then expanded for geometric uncertainties; a standard PTV (STD-PTV) was derived from a single CTV plus conventional margins. Two 3D conformal treatment (3DCRT) plans and one Helical Tomotherapy (HT) plan were generated with a prescription of 60 Gy. Regarding the 3DCRT plans, the 4D-PTV was considered as the target volume for one, and the STD-PTV for the other; the HT plans were performed only for 4D-PTV. Twelve of 15 PTs were admitted to a Phase I hypofractionated study (15 fractions). The prescribed dose was 44.25 Gy to the 4D-PTV and the PTV subvolume around vascular involvement was boosted from 50 to 55 Gy; before treatment, daily patient position was corrected using MVCT. Results. 4D-PTVs were smaller than STD-PTVs with a volume reduction equal to 37%. 3DCRT plans on 4D-PTV showed a significant sparing of most OARs, the use of IMRT allowed a further significant dose reduction. In the Phase I study the PTV subvolume received up to 55 Gy with modest increase in dose to OARs. Conclusions. The 4DCT procedure decreases the overlap between PTV and OARs. HT technique, compared with 3DCRT, allows efficient dose sparing in particular for the duodenum. The IMRT/IGRT approach allows a safe dose escalation to PTV subvolume}
doi = {10.3109/0284186X.2010.484425}
journal = {Acta Oncologica (Stockholm) (online)}
issue = {1}
volume = {50}
place = {Sweden}
year = {2011}
month = {Jan}
}