Search results for "Parametric imaging"
showing 3 items of 3 documents
A Single-sensor High-resolution Panoramic Optical Mapping Configuration for Simultaneous Non-overlapped Complete Atrial and Ventricular Parametric Im…
2017
Nowadays optical mapping (OM) is the primary method for imaging electrophysiologically relevant parameters from the outer surface of Langendorff-perfused hearts. This technique has become essential for comprehensively understanding mechanisms of cardiac propagation during physiological activation, arrhythmia, and therapeutic antiarrhythmic interventions in translational hearts. Panoramic whole heart optical mapping systems, using either multiple cameras, plane mirrors or a combination of both, have been developed to overcome intrinsic visualization limitations to traditional single-sensor designs. However current panoramic OM systems are financially challenging for physiology and engineerin…
Densitometry and parametric imaging with quality control
2002
X-ray contrast image series of the myocardium were studied using the approaches of densitometry and parametric imaging accompanied by quality control. Contrast angiograms were digitized at six predefined phases of the heart cycle. For densitometry, regions of interest (ROIs) were defined semi-automatically for all phases. The resulting six densograms were summed up and weighted according to their quality determined by a measure. Previously validated parameters such as rise time were calculated. The enddiastolic images were only used for the calculation of color-coded parametric images accompanied by pixel-densogram-quality information. An observer gives a score for the perfusion of roughly …
T2 mapping of the peritumoral infiltration zone of glioblastoma and anaplastic astrocytoma.
2021
Purpose To characterise peritumoral zones in glioblastoma and anaplastic astrocytoma evaluating T2 values using T2 mapping sequences. Materials and methods In this study, 41 patients with histopathologically confirmed World Health Organization high grade gliomas and preoperative magnetic resonance imaging examinations were retrospectively identified and enrolled. High grade gliomas were differentiated: (a) by grade, glioblastoma versus anaplastic astrocytoma; and (b) by isocitrate dehydrogenase mutational state, mutated versus wildtype. T2 map relaxation times were assessed from the tumour centre to peritumoral zones by means of a region of interest and calculated pixelwise by using a fit m…