Dosimetry in MARS spectral CT: TOPAS Monte Carlo simulations and ion chamber measurements
| Autor: | C.J. Bateman, S. H. Marsh, John Laban, Anthony Butler, Jerome Damet, Gray Lu, Pierre Carbonez, P. H. Butler |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Diagnostic information
Scanner Monte Carlo method Biomedical Engineering Biophysics General Physics and Astronomy Radiation Dosage Ct dose index 030218 nuclear medicine & medical imaging Mice 03 medical and health sciences 0302 clinical medicine Optics Animals Humans Polymethyl Methacrylate Dosimetry Computer Simulation Radiology Nuclear Medicine and imaging Medipix Radiometry Ions Physics Phantoms Imaging business.industry X-Rays Mars Exploration Program 030220 oncology & carcinogenesis Ionization chamber Tomography X-Ray Computed business Monte Carlo Method |
| Zdroj: | Australasian Physical & Engineering Sciences in Medicine. 40:297-303 |
| ISSN: | 1879-5447 0158-9938 |
| Popis: | Spectral computed tomography (CT) is an up and coming imaging modality which shows great promise in revealing unique diagnostic information. Because this imaging modality is based on X-ray CT, it is of utmost importance to study the radiation dose aspects of its use. This study reports on the implementation and evaluation of a Monte Carlo simulation tool using TOPAS for estimating dose in a pre-clinical spectral CT scanner known as the MARS scanner. Simulated estimates were compared with measurements from an ionization chamber. For a typical MARS scan, TOPAS estimated for a 30 mm diameter cylindrical phantom a CT dose index (CTDI) of 29.7 mGy; CTDI was measured by ion chamber to within 3% of TOPAS estimates. Although further development is required, our investigation of TOPAS for estimating MARS scan dosimetry has shown its potential for further study of spectral scanning protocols and dose to scanned objects. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink