Analysis of electromagnetic transponders tracking data to quantify intrafraction prostate motion during radiotherapy treatments
| Autor: | Mauro Carrara, Barbara Avuzzi, Nice Bedini, S. Morlino, E Pignoli, Riccardo Valdagni, G Carabelli, Sergio Villa, Tommaso Giandini, F Bonfantini, S. Frasca |
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| Rok vydání: | 2017 |
| Předmět: |
History
business.industry medicine.medical_treatment Excursion Isocenter 030218 nuclear medicine & medical imaging Computer Science Applications Education Radiation therapy 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure Prostate 030220 oncology & carcinogenesis Intrafraction motion medicine Tracking data business Nuclear medicine Stereotactic body radiotherapy Prolonged treatment |
| Zdroj: | Journal of Physics: Conference Series. 777:012036 |
| ISSN: | 1742-6596 1742-6588 |
| DOI: | 10.1088/1742-6596/777/1/012036 |
| Popis: | The Calypso tracking system (Varian, Palo Alto, CA, USA) is used to track the prostate isocenter on patients undergoing prostate radiotherapy after implantation of electromagnetic transponders. Aim of this study was to assign 226 recorded prostate tracks to different patterns of prostate intrafraction motion (i.e. stable target (ST), continuous target drift (CTD) and irregular wave motion (IWM)) and excursion (i.e. transient excursion (TE), persistent excursion (PE) and high-frequency excursion (HFE)). Relative frequencies of STs, CTDs and IWMs were 51.8%, 44.6% and 3.6%, respectively. TEs, PEs and HFEs were revealed in 9.4%, 5.4% and 14.3% cases, respectively, with maximum values of 8.0 mm, 8.7 mm and 15.5 mm, respectively. The equation D(t) = 8.0*10-3 mm/s * t + 0.93 mm was established to calculate the average prostate drift D with time t. Intrafraction prostate motion and excursions can be significant and should be in particular taken into account with treatment deliveries that require a prolonged treatment time, as for instance stereotactic body radiotherapy (SBRT) or hadrontherapy. |
| Databáze: | OpenAIRE |
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