Digitally reconstructed radiographs from abdominal CT scans as a new tool for radiotherapy planning

OBJECTIVE. - Abdominal extended field radiotherapy requires exact field shaping. Conventional treatment planning is difficult to adapt to individual anatomy, whereas three-dimensional planning is time-consuming. The authors introduce a method with digitally reconstructed radiographs of spir...

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Main Authors: Bahner, Malte Leonardo (Author) , Debus, Jürgen (Author) , Zabel-du Bois, Angelika (Author) , Levegrün, Sabine (Author) , Kaick, Gerhard van (Author)
Format: Article (Journal)
Language:English
Published: 1999
In: Investigative radiology
Year: 1999, Volume: 34, Issue: 10, Pages: 643-647
ISSN:1536-0210
DOI:10.1097/00004424-199910000-00006
Online Access:Verlag, lizenzpflichtig, Volltext: https://journals.lww.com/investigativeradiology/Fulltext/1999/10000/Digitally_Reconstructed_Radiographs_From_Abdominal.6.aspx
Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1097/00004424-199910000-00006
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Author Notes:M.L. Bahner, J. Debus, A. Zabel, S. Levegrun, G. Van Kaick

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520 |a OBJECTIVE. - Abdominal extended field radiotherapy requires exact field shaping. Conventional treatment planning is difficult to adapt to individual anatomy, whereas three-dimensional planning is time-consuming. The authors introduce a method with digitally reconstructed radiographs of spiral CT data to facilitate radiotherapy planning. - METHODS. - Twenty-two patients underwent imaging with a standardized CT protocol, and digitally reconstructed radiographs were calculated in central beam projection using a maximum intensity projection algorithm (MIP-DRR). For comparison, the expected error from parallel projection was calculated depending on object thickness and field length. - RESULTS. - The contrast-enhanced protocol used in spiral CT produces a good rendition of all relevant structures. The resulting MIP images have a geometry identical to standard simulation films and to the linear accelerator, whereas standard MIPs with parallel projection show significant distortion compared to the treatment process. - CONCLUSIONS. - Because of the integration of the geometry of the radiotherapy treatment, the described central beam projection method might be used as a new tool for abdominal radiotherapy planning. The CT protocol offers sufficient contrast enhancement in all relevant structures and provides all necessary anatomic information for individual beam shaping. 
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