Assessing the fit of 3D printed bolus from CT, optical scanner and photogrammetry methods
| Autor: | Paul Charles, Tanya Kairn, Scott Crowe, Naasiha Cassim, Sarah Maxwell |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
3d printed
Scanner Optics and Photonics Radiological and Ultrasound Technology Computer science business.industry Phantoms Imaging Air Biomedical Engineering Biophysics 3D printing Imaging phantom Bolus (medicine) Photogrammetry Calibration Printing Three-Dimensional Dosimetry Radiology Nuclear Medicine and imaging business Tomography X-Ray Computed Instrumentation Smoothing Biotechnology Biomedical engineering |
| Zdroj: | Physical and engineering sciences in medicine. 43(2) |
| ISSN: | 2662-4737 |
| Popis: | Bolus plays an important role in the radiation therapy of superficial lesions and the application of 3D printing to its design can improve fit and dosimetry. This study quantitatively compares the fits of boluses designed from different imaging modalities. A head phantom was imaged using three systems: a CT simulator, a 3D optical scanner, and an interchangeable lens camera. Nose boluses were designed and 3D printed from each modality. A 3D printed phantom with air gaps of known thicknesses was used to calibrate mean HU to measure air gaps of unknown thickness and assess the fit of each bolus on the head phantom. The bolus created from the optical scanner data resulted in the best fit, with a mean air gap of 0.16 mm. Smoothing of the CT bolus resulted in a more clinically suitable model, comparable to that from the optical scanner method. The bolus produced from the photogrammetry method resulted in air gaps larger than 1 mm in thickness. The use of optical scanner and photogrammetry models have many advantages over the conventional bolus-from-CT method, however workflow should be refined to ensure accuracy if implemented clinically. |
| Databáze: | OpenAIRE |
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