Document Detail

Quantifying motion for pancreatic radiotherapy margin calculation.
MedLine Citation:
PMID:  22410203     Owner:  NLM     Status:  Publisher    
BACKGROUND AND PURPOSE: Pancreatic radiotherapy (RT) is limited by uncertain target motion. We quantified 3D patient/organ motion during pancreatic RT and calculated required treatment margins. MATERIALS AND METHODS: Cone-beam computed tomography (CBCT) and orthogonal fluoroscopy images were acquired post-RT delivery from 13 patients with locally advanced pancreatic cancer. Bony setup errors were calculated from CBCT. Inter- and intra-fraction fiducial (clip/seed/stent) motion was determined from CBCT projections and orthogonal fluoroscopy. RESULTS: Using an off-line CBCT correction protocol, systematic (random) setup errors were 2.4 (3.2), 2.0 (1.7) and 3.2 (3.6)mm laterally (left-right), vertically (anterior-posterior) and longitudinally (cranio-caudal), respectively. Fiducial motion varied substantially. Random inter-fractional changes in mean fiducial position were 2.0, 1.6 and 2.6mm; 95% of intra-fractional peak-to-peak fiducial motion was up to 6.7, 10.1 and 20.6mm, respectively. Calculated clinical to planning target volume (CTV-PTV) margins were 1.4cm laterally, 1.4cm vertically and 3.0cm longitudinally for 3D conformal RT, reduced to 0.9, 1.0 and 1.8cm, respectively, if using 4D planning and online setup correction. CONCLUSIONS: Commonly used CTV-PTV margins may inadequately account for target motion during pancreatic RT. Our results indicate better immobilisation, individualised allowance for respiratory motion, online setup error correction and 4D planning would improve targeting.
Gillian Whitfield; Pooja Jain; Melanie Green; Gillian Watkins; Ann Henry; Julie Stratford; Ali Amer; Thomas Marchant; Christopher Moore; Patricia Price
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-10
Journal Detail:
Title:  Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology     Volume:  -     ISSN:  1879-0887     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8407192     Medline TA:  Radiother Oncol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.
Academic Radiation Oncology, The University of Manchester, United Kingdom.
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