Buddika Sumanasena
University of California, Davis
OpticsPhysicsTopologyRadiologyPET-CTField of viewMultidimensional systemsExponential stabilityGridImage resolutionWireless sensor networkPositron emission tomographyScannerQuantization (signal processing)Nuclear medicineMathematicsComputer scienceComputationNode (networking)State-space representationControl theoryLinear systemRealization (systems)State spaceDetector
12Publications
4H-index
54Citations
Publications 11
Newest
#1Buddika Sumanasena (UC Davis: University of California, Davis)H-Index: 4
#2Qiyu PengH-Index: 9
Last. Ramsey D. Badawi (UC Davis: University of California, Davis)H-Index: 29
view all 7 authors...
POSITRON emission tomography (PET) is used in assessing therapy response, staging, and restaging of breast cancer [1]. However, whole-body PET scanners are not ideally suited to breast imaging due to low geometric sensitivity, low spatial resolution and signal loss due to attenuation in the body. Several groups are working on dedicated breast imaging systems to overcome such limitations[2][3]. Due to the typically smaller field of view (FOV), detectors capable of measuring depth of interaction (...
Source
#1Buddika Sumanasena (UC Davis: University of California, Davis)H-Index: 4
#2Felipe Godinez (UC Davis: University of California, Davis)H-Index: 4
Last. Ramsey D. Badawi (UC Davis: University of California, Davis)H-Index: 29
view all 5 authors...
PERFORMANCE of positron emission tomography (PET) scanners can be improved by using detectors that can measure depth of interaction (DOI) [1]. Dual ended readout is one of the widely studied methods to measure DOI. In this design two photodetectors are coupled to either end of a crystal or a block of crystals and DOI is estimated using the ratio of signal amplitudes recorded by the two photodetectors [2][3][4][5][6]. A hybrid dual ended readout DOI detector that uses a position sensitive photomu...
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#1Andrea Ferrero (UC Davis: University of California, Davis)H-Index: 8
#2Qiyu Peng (LBNL: Lawrence Berkeley National Laboratory)H-Index: 9
Last. Ramsey D. Badawi (UC Davis: University of California, Davis)H-Index: 29
view all 6 authors...
The combined effort of several laboratories at our institution resulted in the building of the first high-resolution PET/CT prototype dedicated to imaging the extremities of the body. Ongoing clinical trials for breast-cancer diagnosis and assessment of the response to treatment underlined the need for a second-generation prototype with improved electronics and spatial resolution. A preliminary version has been assembled and fully characterized. In this work, we present further improvements in d...
10 CitationsSource
#1Felipe Godinez (UC Davis: University of California, Davis)H-Index: 4
#2Buddika Sumanasena (UC Davis: University of California, Davis)H-Index: 4
Last. Ramsey D. Badawi (UC Davis: University of California, Davis)H-Index: 29
view all 10 authors...
#1Buddika Sumanasena (UC Davis: University of California, Davis)H-Index: 4
#2Felipe GodinezH-Index: 4
Last. Ramsey D. BadawiH-Index: 29
view all 8 authors...
3 Citations
#1Andrea FerreroH-Index: 8
#2Qiyu PengH-Index: 9
Last. Ramsey D. BadawiH-Index: 29
view all 10 authors...
Dec 1, 2011 in CDC (Conference on Decision and Control)
#1Buddika Sumanasena (ND: University of Notre Dame)H-Index: 4
#2Peter Bauer (ND: University of Notre Dame)H-Index: 24
In this paper, stability of distributed 3-D systems implemented in sensor networks using the Givone-Roesser and the Fornasini-Marchesini state space models under floating point arithmetic is studied. Nonlinearities caused by floating point number representation schemes used for in node computations and inter node communication are modeled. Stability of the system is analyzed with special consideration given to the influence of internode communication on system dynamics. A necessary and sufficien...
1 CitationsSource
#1Buddika Sumanasena (ND: University of Notre Dame)H-Index: 4
#2Peter Bauer (ND: University of Notre Dame)H-Index: 24
Using the Roesser model, a method for distributed information processing in grid sensor networks is presented by Sumanasena and Bauer (A Roesser model based multidimensional systems approach for grid sensor networks. Pacific Grove, California, 2009). The method can be used to implement linear systems in grid sensor networks. Unless information originating in a node can be conveyed over the entire sensor network in a single time slot, for a system described by the Roesser model to be implementabl...
25 CitationsSource
Jan 1, 2011 in DCAI (Distributed Computing and Artificial Intelligence)
#1Buddika Sumanasena (ND: University of Notre Dame)H-Index: 4
#2Peter Bauer (ND: University of Notre Dame)H-Index: 24
Using local state space models, a method for distributed information processing in rectangular grid sensor networks is presented. Non-linear systems and signal processing algorithms are represented in a local state space model. Then the local state space model is implemented on the sensor network. The local state space models used are generalizations of Fornasini-Marchesini and Givone-Roesser models for linear time-invariant 3-D systems. Realtime implementation issues of the said method are also...
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#1Buddika Sumanasena (ND: University of Notre Dame)H-Index: 4
#2Peter Bauer (ND: University of Notre Dame)H-Index: 24
Using the Givone-Roesser model for m-D systems, a method for distributed information processing in rectangular grid based sensor networks is presented. The method enables a distributed implementation of linear systems on a sensor network. Nonlinearities caused by quantization schemes used for in node computations and inter node communication are modeled. Global asymptotic stability of the system under quantization is analyzed. Special consideration is given to the effect of internode communicati...
8 CitationsSource