Maerz, Manuel and Koelbl, Oliver and Dobler, Barbara (2015) Influence of metallic dental implants and metal artefacts on dose calculation accuracy. STRAHLENTHERAPIE UND ONKOLOGIE, 191 (3). pp. 234-241. ISSN 0179-7158, 1439-099X
Full text not available from this repository. (Request a copy)Abstract
Purpose Metallic dental implants cause severe streaking artefacts in computed tomography (CT) data, which inhibit the correct representation of shape and density of the metal and the surrounding tissue. The aim of this study was to investigate the impact of dental implants on the accuracy of dose calculations in radiation therapy planning and the benefit of metal artefact reduction (MAR). A second aim was to determine the treatment technique which is less sensitive to the presence of metallic implants in terms of dose calculation accuracy. Materials and methods Phantoms consisting of homogeneous water equivalent material surrounding dental implants were designed. Artefact-containing CT data were corrected using the correct density information. Intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) plans were calculated on corrected and uncorrected CT data and compared to 2-dimensional dose measurements using GafChromic (TM) EBT2 films. Results For all plans the accuracy of dose calculations is significantly higher if performed on corrected CT data (p = 0.015). The agreement of calculated and measured dose distributions is significantly higher for VMAT than for IMRT plans for calculations on uncorrected CT data (p = 0.011) as well as on corrected CT data (p = 0.029). Conclusion For IMRT and VMAT the application of metal artefact reduction significantly increases the agreement of dose calculations with film measurements. VMAT was found to provide the highest accuracy on corrected as well as on uncorrected CT data. VMAT is therefore preferable over IMRT for patients with metallic implants, if plan quality is comparable for the two techniques.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VOLUMETRIC MODULATED ARC; RADIOCHROMIC FILM DOSIMETRY; THERAPY VMAT; RADIATION-THERAPY; CLINICAL-EVALUATION; PLAN QUALITY; NECK-CANCER; IMRT; RADIOTHERAPY; IMPACT; Computed tomography; Metal artifacts; Dental implants; Radiotherapy; Intensity modulated radiation therapy; GafChromic |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Strahlentherapie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 Jul 2019 06:07 |
| Last Modified: | 26 Jul 2019 06:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5922 |
Actions (login required)
 |
View Item |
