Cardiac photon-counting detector computed tomography in acute ischemic stroke: diagnostic accuracy for detection of left atrial appendage thrombus / Annemarie Kirschfink, Mohamed Elhalal, Stefan Seidel, Stefanie Kammer, Dimah Hasan, Michael Frick, Nikolaus Albert Helmut Marx, Jörg Bernhard Schulz, Martin Wiesmann, Ertunc Altiok, Hani Ridwan, Arno Reich, João Diogo Pinhal Ferreira de Pinho