4D Imaging and 4D Radiation Therapy: A New Era of Therapy Design and Delivery

2011 ◽  
pp. 99-117 ◽  
Author(s):  
Daniel Low
Keyword(s):  
Radiation Therapy ◽  
New Era ◽  
4D Imaging ◽  
Therapy Design

scholarly journals Magnetic resonance-guided radiation therapy: the beginning of a new era

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Guillaume Landry ◽  
Stefanie Corradini ◽  
Claus Belka
Keyword(s):  
Radiation Therapy ◽  
Magnetic Resonance ◽  
New Era

SU-FF-I-12: Clinical Impact of Four-Dimensional (4D) Imaging On Radiation Therapy

2007 ◽  
Vol 34 (6Part2) ◽  
pp. 2340-2340
Author(s):  
J Antony ◽  
L Xing
Keyword(s):  
Radiation Therapy ◽  
Clinical Impact ◽  
4D Imaging

scholarly journals A New Era of Image Guidance with Magnetic Resonance-guided Radiation Therapy for Abdominal and Thoracic Malignancies

Cureus ◽  
2018 ◽  
Author(s):  
Kathryn Mittauer ◽  
Bhudatt Paliwal ◽  
Patrick Hill ◽  
John E Bayouth ◽  
Mark W Geurts ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Magnetic Resonance ◽  
Image Guidance ◽  
New Era ◽  
Thoracic Malignancies

scholarly journals Account for the Full Extent of Esophagus Motion in Radiation Therapy Planning: A Preliminary Study of the IRV of the Esophagus

2021 ◽  
Vol 11 ◽  
Author(s):  
Aihui Feng ◽  
Hengle Gu ◽  
Hua Chen ◽  
Yan Shao ◽  
Hao Wang ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Three Dimensional ◽  
Maximum Intensity Projection ◽  
Radiotherapy Planning ◽  
Full Extent ◽  
Lung Cancer Patients ◽  
4D Imaging ◽  
Random Components ◽  
3D Scans ◽  
Important Basis

ObjectiveAccounting for esophagus motion in radiotherapy planning is an important basis for accurate assessment of toxicity. In this study, we calculated how much the delineations of the esophagus should be expanded based on three-dimensional (3D) computed tomography (CT), four-dimensional (4D) average projection (AVG), and maximum intensity projection (MIP) scans to account for the full extent of esophagus motion during 4D imaging acquisition.Methods and MaterialsThe 3D and 4D CT scans of 20 lung cancer patients treated with conventional radiotherapy and 20 patients treated with stereotactic ablative radiation therapy (SBRT) were used. Radiation oncologists contoured the esophagus on the 3DCT, AVG, MIP and 25% exhale scans, and the combination of the esophagus in every phase of 4DCT. The union of all 4D phase delineations (U4D) represented the full extent of esophagus motion during imaging acquisition. Surface distances from U4D to 3D, AVG, and MIP volumes were calculated. Distances in the most extreme surface points (1.5 cm most superoinferior, 10% most right/left/anteroposterior) were used to derive margins accounting only for systematic (delineation) errors.ResultsEsophagus delineations on the MIP were the closest to the full extent of motion, requiring only 6.9 mm margins. Delineations on the AVG and 3D scans required margins up to 7.97 and 7.90 mm, respectively. The largest margins were for the inferior, right, and anterior aspects for the delineations on the 3D, AVG, and MIP scans, respectively.ConclusionDelineations on 3D, AVG, or MIP scans required extensions for representing the esophagus’s full extent of motion, with the MIP requiring the smallest margins. Research including daily imaging to determine the random components for the margins and dosimetric measurements to determine the relevance of creating a planning organ at risk volume (PRV) of the esophagus is required.

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