| Hauptseite > Dosimetry in MARS spectral CT: TOPAS Monte Carlo simulations and ion chamber measurements |
| Published Articles | |
| Title | Dosimetry in MARS spectral CT: TOPAS Monte Carlo simulations and ion chamber measurements |
| Related title | Dosimetry in MARS spectral CT: TOPAS Monte Carlo simulations and ion chamber measurements |
| Author(s) | Lu, Gray (Canterbury U.) ; Marsh, Steven (Canterbury U.) ; Damet, Jerome (CERN ; Lausanne University Hospital, Lausanne ; U. Otago, Dept. Radiol.) ; Carbonez, Pierre (CERN ; U. Otago, Dept. Radiol.) ; Laban, John (National Centre for Radiation Science, Christchurch) ; Bateman, Christopher (Canterbury U. ; U. Otago, Dept. Radiol. ; MARS Bioimaging) ; Butler, Anthony (U. Otago, Dept. Radiol. ; MARS Bioimaging) ; Butler, Phil (Canterbury U. ; MARS Bioimaging) |
| Publication | 2017 |
| Number of pages | 7 |
| In: | Australasian Physical & Engineering Sciences in Medicine 40 (2017) 297-303 |
| DOI | 10.1007/s13246-017-0532-8 |
| Subject category | Detectors and Experimental Techniques |
| Abstract | 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. |