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3D-printed patient-specific pelvis phantom for dosimetry measurements for prostate stereotactic radiotherapy with dominant intraprostatic lesion boost
- Source :
- Physica Medica. 92:8-14
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Aim Developing and assessing the feasibility of using a three-dimensional (3D) printed patient-specific anthropomorphic pelvis phantom for dose calculation and verification for stereotactic ablative radiation therapy (SABR) with dose escalation to the dominant intraprostatic lesions. Material and methods A 3D-printed pelvis phantom, including bone-mimicking material, was fabricated based on the computed tomography (CT) images of a prostate cancer patient. To compare the extent to which patient and phantom body and bones overlapped, the similarity Dice coefficient was calculated. Modular cylindrical inserts were created to encapsulate radiochromic films and ionization chamber for absolute dosimetry measurements at the location of prostate and at the boost region. Gamma analysis evaluation with 2%/2mm criteria was performed to compare treatment planning system calculations and measured dose when delivering a 10 flattening filter free (FFF) SABR plan and a 10FFF boost SABR plan. Results Dice coefficients of 0.98 and 0.91 were measured for body and bones, respectively, demonstrating agreement between patient and phantom outlines. For the boost plans the gamma analysis yielded 97.0% of pixels passing 2%/2mm criteria and these results were supported by the chamber average dose difference of 0.47 ± 0.03%. These results were further improved when overriding the bone relative electron density: 97.3% for the 2%/2mm gamma analysis, and 0.05 ± 0.03% for the ionization chamber average dose difference. Conclusions The modular patient-specific 3D-printed pelvis phantom has proven to be a highly attractive and versatile tool to validate prostate SABR boost plans using multiple detectors.
- Subjects :
- business.industry
medicine.medical_treatment
Biophysics
General Physics and Astronomy
General Medicine
medicine.disease
SABR volatility model
Imaging phantom
Radiation therapy
Prostate cancer
medicine.anatomical_structure
Ionization chamber
medicine
Dosimetry
Radiology, Nuclear Medicine and imaging
Nuclear medicine
business
Radiation treatment planning
Pelvis
Subjects
Details
- ISSN :
- 11201797
- Volume :
- 92
- Database :
- OpenAIRE
- Journal :
- Physica Medica
- Accession number :
- edsair.doi.dedup.....bfafd4ada11e845b59b12b399d636e59