INTRODUCTION: In various medical image applications like image-guided interventions, radiotherapy treatment planning or motion-compensated reconstructions, it is desired to reconstruct multiple motion-free high resolution respiratory phases from free-breathing 3D MRI. Common navigator gating techniques [1-3] are a proven approach to reconstruct single or reduced number of motion-free respirator...

Cardiopulmonary imaging in rodents using micro-computed tomography (CT) is a challenging task due to both cardiac and pulmonary motion and the limited fluence rate available from micro-focus x-ray tubes of most commercial systems. Successful imaging in the mouse requires recognition of both the spatial and temporal scales and their impact on the required fluence rate. Smaller voxels require an ...

Introduction The LGE method can visualize post-ablation scar in the LA, using increased spatial resolution (1-2). However, the inversion pulse required for LGE also nulls the liver signal at the time of data acquisition (optimal TI time), so that NAV-gating, used for respiratory compensation, becomes impossible. The NAV-restore (3), which reinverts the region of the liver immediately after the ...

Our aim of this study was to evaluate prospectively in patients with pancreatic cancer the effects of respiratory- gating during PET/CT acquisition on the determination of lesion volume and to measure tracer uptake. Our research included 36 patients diagnosed with pancreatic cancer. They underwent conventional whole-body PET/CT and subsequently respiratory-gated PET/CT of the upper abdomen. Bas...

PURPOSE Physiological respiratory motion of tumors growing in the lung can be corrected with respiratory gating when treated with radiotherapy (RT). The optimal respiratory phase for beam-on may be assessed with a respiratory phase optimizer (RPO), a 4D image processing software developed with this purpose. METHODS AND MATERIALS Fourteen patients with lung cancer were included in the study. E...

The thalamus may be the critical brain area involved in sensory gating and the relay of respiratory mechanical information to the cerebral cortex for the conscious awareness of breathing. We hypothesized that respiratory mechanical stimuli in the form of tracheal occlusions would modulate the gene expression profile of the thalamus. Specifically, it was reasoned that conditioning to the respira...