Fig. 8

Breath-held and free-breathing sparsity in different domains. The image (a), x-t (b), x-f (c), and x-KLT (d) domains of simulated breath-held (top) and free-breathing (bottom) datasets. The x-f domain (c) is seen to be far more sparse when the patient is breath-holding than when the patient is allowed to breathe. (d) shows the potential for alternate domains to increase sparsity, with improvements in both cases, but of particular importance in the case of free-breathing. KLT stands for Karhunen-Loève transform and is not discussed further - more information can be found in the references in the text. Reproduced from [100]