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Abstract #4399

Joint cardiorespiratory 1D navigator triggering using left ventricular motion: improving T2w-FSE imaging for thoracic radiotherapy

Aart van Bochove1, Katrinus Keijnemans1, Osman Akdag1, Pim Borman1, Martin Fast1, and Astrid van Lier1
1Department of Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands


For MR-guided radiotherapy treatment planning of the thorax, cardiorespiratory triggered T2-weighted MRI images are desired. We investigate the usage of a navigator placed on the left ventricle to do cardiorespiratory triggering, and compare it to images obtained by placing the navigator on the liver-lung interface to do respiratory triggering. We scanned 5 healthy volunteers, making high-resolution scans with both navigators, and cine and 4D-MRI scans for reference. We found that cardiorespiratory triggering based on left ventricular motion is possible, and increases image quality, without increasing scan time and losing geometrical respiratory information.

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