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Development of an automated radiotherapy dose accumulation workflow for locally advanced high-risk prostate cancer - A technical report
- Source :
- Journal of Medical Radiation Sciences, Journal of Medical Radiation Sciences, Vol 68, Iss 2, Pp 203-210 (2021)
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- An automated dose accumulation and contour propagation workflow using daily cone beam computed tomography (CBCTs) images for prostate cases that require pelvic lymph nodes irradiation (PLNs) was developed. This workflow was constructed using MIM® software with the intention to provide accurate dose transformations for plans with two different isocentres, whereby two sequential treatment phases were prescribed. The pre‐processing steps for data extractions from treatment plans, CBCTs, determination of couch shift information and management of missing CBCTs are described. To ensure that the imported translational couch shifts were in the correct orientation and readable in MIM, phantom commissioning was performed. For dose transformation, rigid registration with corrected setup shifts and scaled fractional dose was performed for pCT to daily CBCTs, which were then deformed onto CBCT1. Fractional dose summation resulted in the final accumulated dose for the patient allowing differences in dosimetry between the planned and accumulated dose to be analysed. Contour propagations of the prostate, bladder and rectum were performed within the same workflow. Transformed contours were then deformed onto daily CBCTs to generate trending reports for analysis, including Dice Similarity Coefficient (DSC) and Mean Distance to Agreement (MDA). Results obtained from phantom commissioning (DSC = 0.96, MDA = 0.89 mm) and geometrical analysis of the propagated contours for twenty patients; prostate (DSC: 0.9 ± 0.0, MDA: 1.0 ± 0.3 mm), rectum (DSC: 0.8 ± 0.1, mm, MDA: 1.7 ± 0.6 mm) and bladder (DSC: 0.8 ± 0.1, MDA: 2.8 ± 1.0 mm) were within clinically accepted tolerances for both DSC (>0.8) and MDA (< 0.3 mm). The developed workflow is being performed on a larger patient cohort for predictive model building, with the goal of correlating observed toxicity with the actual accumulated dose received by the patient.<br />An automated dose accumulation and contour propagation workflow using daily cone beam computed tomography images for prostate cancer was developed.
- Subjects :
- Male
Cone beam computed tomography
workflow
R895-920
Locally advanced
Imaging phantom
030218 nuclear medicine & medical imaging
RC0254
Medical physics. Medical radiology. Nuclear medicine
03 medical and health sciences
Prostate cancer
0302 clinical medicine
Prostate
Image Processing, Computer-Assisted
Humans
Dosimetry
Medicine
Radiotherapy dose
Radiology, Nuclear Medicine and imaging
whole‐pelvis radiotherapy
Technical Evaluation
Radiological and Ultrasound Technology
Dose accumulation
dose accumulation
business.industry
Radiotherapy Planning, Computer-Assisted
Prostatic Neoplasms
Radiotherapy Dosage
prostate cancer
medicine.disease
R1
medicine.anatomical_structure
030220 oncology & carcinogenesis
Deformable image registration
business
Nuclear medicine
Algorithms
Subjects
Details
- Language :
- English
- ISSN :
- 20513909
- Database :
- OpenAIRE
- Journal :
- Journal of Medical Radiation Sciences, Journal of Medical Radiation Sciences, Vol 68, Iss 2, Pp 203-210 (2021)
- Accession number :
- edsair.doi.dedup.....675b8d0caafefd3056f79b30621464aa