Prevrhal
Sven Prevrhal, San Francisco, CA US
Patent application number | Description | Published |
---|---|---|
20110274333 | MEASUREMENT OF BLOOD FLOW DYNAMICS WITH X-RAY COMPUTED TOMOGRAPHY: DYNAMIC CT ANGIOGRAPHY - In various embodiments, systems and methods can provide accurate measurements of blood flow dynamics in a subject. Projection data acquired during a computed tomography (CT) scan of the subject can be used to determine information representing inflow of a contrast material. Accordingly, a measurement of flow velocity, in addition to other aspects of flow, may be obtained from the projection data. | 11-10-2011 |
20130243298 | DIAGNOSTIC IMAGE FEATURES CLOSE TO ARTIFACT SOURCES - When correcting for artifacts on an attenuation map caused by an artifact source in a computed tomography image, nuclear images are reconstructed two or more times, each time using a different correction technique or uncorrected attenuation data. Corresponding voxels in the reconstructed images are compared to identify local areas that change, i.e., are fragile and therefore low-confidence, and areas that do not vary or exhibit little variance among the plurality of reconstructed images and are thus accorded a higher confidence. The reconstructed nuclear image is overlaid with color encoding indicative of the amount of confidence accorded to each voxel value obtained by attenuation-corrected tomographic reconstruction. | 09-19-2013 |
Sven Prevrhal, Hamburg DE
Patent application number | Description | Published |
---|---|---|
20140119611 | LIST MODE DYNAMIC IMAGE RECONSTRUCTION - A nuclear imaging apparatus ( | 05-01-2014 |
20140119630 | DOSE-OPTIMIZED PROTOCOL FOR AC AND LOCALIZATION ON HYPRID SCANNERS - A hybrid imaging system including a first imaging system configured to acquire low resolution anatomical data of a first field of view of an anatomical structure. A second imaging system is configured to acquire functional data of the first field of view of the anatomical structure. A reconstruction processor is configured to reconstruct the functional data based on attenuation data into an attenuation corrected image. In response to the attenuation corrected image showing regions of interest, with the first imaging system or another imaging system acquiring high resolution data of one or more portions of the first field of view containing the regions of interest. The reconstruction processor reconstructs the high resolution anatomical data into one or more high resolution images of the regions of interest. | 05-01-2014 |
20140257096 | DATA-DRIVEN OPTIMIZATION OF EVENT ACCEPTANCE/REJECTION LOGIC - In Positron Emission Tomography, a time window ( | 09-11-2014 |
Sven P. Prevrhal, San Francisco, CA US
Patent application number | Description | Published |
---|---|---|
20110182491 | Shift-Varing Line Projection using graphics hardware - Line segments are classified according to orientation to improve list mode reconstruction of tomography data using graphics processing units (GPUs). The new approach addresses challenges which include compute thread divergence and random memory access by exploiting GPU capabilities such as shared memory and atomic operations. The benefits of the GPU implementation are compared with a reference CPU-based code. When applied to positron emission tomography (PET) image reconstruction, the GPU implementation is 43× faster, and images are virtually identical. In particular, the deviation between the GPU and the CPU implementation is less than 0.08% (RMS) after five iterations of the reconstruction algorithm, which is of negligible consequence in typical clinical applications. | 07-28-2011 |