Navigators for motion detection during real-time MRI-guided radiotherapy
| Autor: | Jan J W Lagendijk, Maurits M Barendrecht, Bernard A. Zonnenberg, Sjoerd P M Crijns, Marco van Vulpen, Bas W. Raaymakers, Mette K Stam |
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| Rok vydání: | 2012 |
| Předmět: |
Time Factors
Radiological and Ultrasound Technology Phantoms Imaging business.industry Movement medicine.medical_treatment Time lag Motion detection Real-time MRI Kidney Tracking (particle physics) Magnetic Resonance Imaging Imaging phantom Feedback Breath Holding Radiation therapy Humans Medicine Radiology Nuclear Medicine and imaging Computer vision Gated radiotherapy Artificial intelligence business Radiotherapy Image-Guided |
| Zdroj: | Physics in Medicine and Biology. 57:6797-6805 |
| ISSN: | 1361-6560 0031-9155 |
| DOI: | 10.1088/0031-9155/57/21/6797 |
| Popis: | An MRI-linac system provides direct MRI feedback and with that the possibility of adapting radiation treatments to the actual tumour position. This paper addresses the use of fast 1D MRI, pencil-beam navigators, for this feedback. The accuracy of using navigators was determined on a moving phantom. The possibility of organ tracking and breath-hold monitoring based on navigator guidance was shown for the kidney. Navigators are accurate within 0.5 mm and the analysis has a minimal time lag smaller than 30 ms as shown for the phantom measurements. The correlation of 2D kidney images and navigators shows the possibility of complete organ tracking. Furthermore the breath-hold monitoring of the kidney is accurate within 1.5 mm, allowing gated radiotherapy based on navigator feedback. Navigators are a fast and precise method for monitoring and real-time tracking of anatomical landmarks. As such, they provide direct MRI feedback on anatomical changes for more precise radiation delivery. |
| Databáze: | OpenAIRE |
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