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Cone beam computer tomography (CBCT) dose calculation can provide many advantages for adaptive radiotherapy despite the loss of accuracy associated, mainly due to beam scatter that causes Hounfield number (HU) inconsistency.Analyze the differences between CT and CBCT dose calculation for a volumetric modulated arc therapy (VMAT) treatment, using different calibration curves.It has been used an Alderson...
It is difficult to acquire tagged cardiac MR images with a high temporal and spatial resolution using clinical MR scanners. However, if such images are used for quantifying scores based on motion, it is essential a resolution as high as possible. This paper explores the influence of the temporal resolution of a tagged series on the quantification of myocardial dynamic parameters. To such purpose we...
The objective of this work is to evaluate the feasibility of using non-rigid registration techniques to estimates myocardial motion from CINE-MR images without user interaction. Myocardial displacement field was obtained using a pair-wise non rigid registration technique that computes incremental motion for every consecutive pair of images in the sequence. We use a semi-local parametric deformation...
SPAMM (spatial modulation of magnetization) sequences for tissue tagging suffer from fading of the tags due to tissue Tl decay. This fading is especially important in cardiac imaging, since it affects the frames acquired in the second half of the cardiac cycle. On the other hand, breath-hold sequences are difficult to hold along a prolonged exploration. We present an alternative SPAMM sequence with...
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