A5011063866- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Advanced MRI Techniques and Applications
- High-Energy Particle Collisions Research
- Luminescence Properties of Advanced Materials
- CCD and CMOS Imaging Sensors
- Dark Matter and Cosmic Phenomena
- Advanced X-ray and CT Imaging
- Analog and Mixed-Signal Circuit Design
- Quantum Chromodynamics and Particle Interactions
- Advanced Semiconductor Detectors and Materials
- Particle Accelerators and Free-Electron Lasers
- Radiomics and Machine Learning in Medical Imaging
- Photocathodes and Microchannel Plates
- Lanthanide and Transition Metal Complexes
- Cardiac Imaging and Diagnostics
- Radiation Therapy and Dosimetry
- Gyrotron and Vacuum Electronics Research
- Advanced Radiotherapy Techniques
- Radiopharmaceutical Chemistry and Applications
- Radioactive contamination and transfer
Brookhaven National Laboratory
2014-2024
Brookhaven College
1991-2017
Université de Sherbrooke
2009
RIKEN BNL Research Center
2002-2008
Stony Brook University
2006
University of Michigan–Ann Arbor
1998
United States Department of State
1994
Duke University
1994
Boston University
1994
Rikkyo University
1994
Proton computed tomography (pCT) has the potential to improve accuracy of dose calculations for proton treatment planning, and will also be useful pretreatment verification patient positioning relative beam. A design study was performed define optimal approach a pCT system based on specifications applications in therapy. Conceptual detailed is presented; consists silicon-based particle tracking crystal calorimeter measure energy loss individual protons. We discuss formation images...
We developed a non-magnetic positron-emission tomography (PET) device based on the rat conscious animal PET that operates in small-animal magnetic resonance imaging (MRI) scanner, thereby enabling us to carry out simultaneous PET/MRI studies. The detector comprises 12 blocks, each being 4 × 8 array of lutetium oxyorthosilicate crystals (2.22 2.22 5 mm(3)) coupled matching avalanche photodiode array. housed plastic case, form 38 mm inner diameter ring with an 18 axial extent. Custom-built MRI...
Anesthesia is currently required for positron emission tomography (PET) studies of the animal brain in order to eliminate motion artifacts. However, anesthesia profoundly affects neurological state animal, complicating interpretation PET data. Furthermore, it precludes use study during normal behavior. The rat conscious tomograph (RatCAP) designed need studies. It a miniaturized full-ring scanner that attached directly head, imaging nearly entire brain. RatCAP utilizes arrays 2 mm /spl...
The scintillation and radiation damage properties of barium fluoride crystals doped with various rare earths have been studied in an attempt to develop a fast, hard scintillating crystal suppressed slow component for use at high counting rates. light output BaF/sub 2/ samples was measured solar blind (CsTe) photomultiplier tube compared standard bialkali phototube. For dopants showing strong suppression, measurements were also made elevated temperatures indicate that additional suppression...
Several readout techniques for undoped CsI have been studied which utilize the fast scintillation component speed and high photon yield good energy resolution. Quantum yields measured samples up to 30 cm in length using photomultiplier tubes, wavelength shifters, silicon photodiodes. A study has also made of properties CsI. It is found that light output decay time 310-nm increases emission spectrum shifts longer wavelengths at lower temperatures. The effects on optical transmission due...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The RatCAP has been designed and constructed to image the awake rat brain. In order maximize system performance, offline digital coincidence data processing algorithms including offset delay correction prompt delayed detection have developed validated. With using a singular value decomposition (SVD) technique, overall time resolution was improved from 32.6 17.6 ns FWHM. experimental results...
At Brookhaven National Laboratory, we are developing a simultaneous PET-MRI breast imaging system. A prototype II version of the PET system has been constructed. This device consists 24 detector blocks where each block 4 × 8 array 2.2 15 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> LYSO crystal directly coupled to non-magnetic APD array. The scanner an inner diameter 100 and axial extent 18 mm. Resolution measurements were carried...
We characterized the performance of Silicon Photomultipliers (SiPMs) before and after exposure up to 1012 neutron/cm2 dosage. show that typical orders magnitude increase dark current upon neutron irradiation can be suppressed by operating it at a lower temperature single-photoelectron detection capability restored. The required depends on dosage received. Furthermore, high thermal annealing, there is compelling evidence extrinsic lowered single-photon are some extent recovered room...
Radiation damage in undoped CsI and CsI(Tl) crystals using /sup 60/Co gamma radiation for doses up to approximately 4.2*10/sup 6/ has been studied. Samples from various manufacturers were measured, ranging size 2.54-cm-long cylinders a 30-cm-long block. Measurements made on the change optical transmission scintillation light output as function of dose. Although some samples showed small transmission, significant was observed all samples. Recovery also studied time exposure UV light. A...
We report on the development of front-end electronics for rat conscious animal positron emission tomography (RatCAP), a portable and miniature scanner. The application-specific integrated circuit (ASIC) is realized in complementary metal-oxide-semiconductor 0.18 /spl mu/m technology composed 32 channels charge sensitive preamplifier, third-order semi-Gaussian bipolar shaper, timing discriminator with independent channel adjustable threshold, 32-line address serial encoder to minimize number...
The ability to acquire high resolution anatomical data as well quantitative functional information in vivo is becoming an increasingly important factor the diagnosis of disease. Simultaneous acquisition PET and MRI would provide essentially perfect co-registration between two images which particularly for tissues whose position shape can change sequential scans. RatCAP a complete 3D tomograph that designed image brain awake rat. A special coil composed 2 saddle elements working quadrature...
A study has been carried out to investigate the gain stability and charging effects in Gas Electron Multipliers (GEMs). It was found that of a GEM typically rises after initial application high voltage across foil, but degree rate rise can depend on variety different factors. These factors include geometry foil (inner outer hole diameter), ionizing radiation applied amount water content operating gas, possibly various other related manufacturing process. We have studied GEMs produced by...
We report on the design and characterization of a new ASIC for RatCAP, head-mounted miniature PET scanner intended neurological behavioral studies an awake rat. The is composed 32 channels, each consisting charge sensitive preamplifier, 5-bit programmable gain in pole-zero network, 3 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rd</sup> order bipolar semi-Gaussian shaper (peaking time 80 ns), timing energy discriminator. discriminator channel...