UH3EB034686
Cooperative Agreement
Overview
Grant Description
Development of a combined gamma/positron system for molecular imaging of the human brain at sub-500 micron spatial resolution - Summary
We are proposing a new approach to a hybrid imaging modality that has been called “B+G” or “PAMMA-POSITRON” imaging [GRI07] that promises to simultaneously overcome 1) the sensitivity limits of single-gamma-ray-photon emission imaging, 2) the challenge of distinguishing between two different positron-emitting isotopes, and 3) the physics-based spatial resolution limits inherent in radioisotope imaging based on detection of positron-annihilation photons alone [LAN14].
The intent is to significantly advance molecular imaging of the human brain by allowing visualization of smaller substructures, quantification of smaller amounts of radiotracer uptake, and simultaneous measurement of multiple dynamic and spatial uptake patterns in advanced multi-isotope studies of normal brain function.
The required elements to make this feasible comprise I) a detector approach for annihilation and gamma-ray photons that can yield rich data for precise energy, position, and timing estimation for both photoelectric and Compton interactions, II) processing algorithms in firmware and software to sort and make optimal use of the various combinations of signals that can occur with and without coincidence, III) reconstruction algorithms based on likelihoods that incorporate probabilities of emission, detection, positron range, non-collinearity, and Compton kinematics, and IV) detection and compensation for attenuation and subject motion – effects that if not addressed will become limiting factors for resolution and image quality.
In contrast to early efforts to accomplish B+G imaging with liquid xenon detectors [GRI07], scattering detectors as inserts into PET scanners [YOS20], or planar semiconductor detectors paired with scintillation cameras [LAN14], we propose instead to develop and demonstrate a single detector technology and associated data processing methods that can be used for both 511 keV annihilation photons and the higher-energy, singly-emitted gamma rays.
Abbaszadeh (MPI) and Levin have pioneered an edge-on crossed-strip cadmium zinc telluride (CZT) detector approach to PET detectors that provides an ideal starting point [ABB16].
Among their attributes are high stopping power based on the edge-on geometry, 3D positioning that minimizes parallax, excellent energy resolution, and dynamic range up to 1.2 MeV in maximum photon energy deposited per interaction.
Furthermore, when a photon undergoes an initial scatter followed by a photoelectric absorption, these modules yield data vectors that allow position and energy estimation for both interactions that can be analyzed with Compton kinematics [ABB17].
We will carry out a 2-year simulation and proof-of-principle phase (UG3) in which we demonstrate B+G detection with edge-on CZT modules and measure detector characteristics, develop simulations that support reconstructions, and demonstrate acquisitions with single and multiple isotopes.
We will carry out a three-year UH3 phase to build a tomographic system with a field of view sufficient to investigate imaging of sophisticated dynamic phantoms and in vivo imaging of rodent brain, as a design study and precursor to a human brain system.
We are proposing a new approach to a hybrid imaging modality that has been called “B+G” or “PAMMA-POSITRON” imaging [GRI07] that promises to simultaneously overcome 1) the sensitivity limits of single-gamma-ray-photon emission imaging, 2) the challenge of distinguishing between two different positron-emitting isotopes, and 3) the physics-based spatial resolution limits inherent in radioisotope imaging based on detection of positron-annihilation photons alone [LAN14].
The intent is to significantly advance molecular imaging of the human brain by allowing visualization of smaller substructures, quantification of smaller amounts of radiotracer uptake, and simultaneous measurement of multiple dynamic and spatial uptake patterns in advanced multi-isotope studies of normal brain function.
The required elements to make this feasible comprise I) a detector approach for annihilation and gamma-ray photons that can yield rich data for precise energy, position, and timing estimation for both photoelectric and Compton interactions, II) processing algorithms in firmware and software to sort and make optimal use of the various combinations of signals that can occur with and without coincidence, III) reconstruction algorithms based on likelihoods that incorporate probabilities of emission, detection, positron range, non-collinearity, and Compton kinematics, and IV) detection and compensation for attenuation and subject motion – effects that if not addressed will become limiting factors for resolution and image quality.
In contrast to early efforts to accomplish B+G imaging with liquid xenon detectors [GRI07], scattering detectors as inserts into PET scanners [YOS20], or planar semiconductor detectors paired with scintillation cameras [LAN14], we propose instead to develop and demonstrate a single detector technology and associated data processing methods that can be used for both 511 keV annihilation photons and the higher-energy, singly-emitted gamma rays.
Abbaszadeh (MPI) and Levin have pioneered an edge-on crossed-strip cadmium zinc telluride (CZT) detector approach to PET detectors that provides an ideal starting point [ABB16].
Among their attributes are high stopping power based on the edge-on geometry, 3D positioning that minimizes parallax, excellent energy resolution, and dynamic range up to 1.2 MeV in maximum photon energy deposited per interaction.
Furthermore, when a photon undergoes an initial scatter followed by a photoelectric absorption, these modules yield data vectors that allow position and energy estimation for both interactions that can be analyzed with Compton kinematics [ABB17].
We will carry out a 2-year simulation and proof-of-principle phase (UG3) in which we demonstrate B+G detection with edge-on CZT modules and measure detector characteristics, develop simulations that support reconstructions, and demonstrate acquisitions with single and multiple isotopes.
We will carry out a three-year UH3 phase to build a tomographic system with a field of view sufficient to investigate imaging of sophisticated dynamic phantoms and in vivo imaging of rodent brain, as a design study and precursor to a human brain system.
Awardee
Funding Goals
TO SUPPORT HYPOTHESIS-, DESIGN-, TECHNOLOGY-, OR DEVICE-DRIVEN RESEARCH RELATED TO THE DISCOVERY, DESIGN, DEVELOPMENT, VALIDATION, AND APPLICATION OF TECHNOLOGIES FOR BIOMEDICAL IMAGING AND BIOENGINEERING. THE PROGRAM INCLUDES BIOMATERIALS (BIOMIMETICS, BIOPROCESSING, ORGANOGENESIS, REHABILITATION, TISSUE ENGINEERING, IMPLANT SCIENCE, MATERIAL SCIENCE, INTERFACE SCIENCE, PHYSICS AND STRESS ENGINEERING, TECHNOLOGY ASSESSMENT OF MATERIALS/DEVICES), BIOSENSORS/BIOTRANSDUCERS (TECHNOLOGY DEVELOPMENT, TECHNOLOGY ASSESSMENT, DEVELOPMENT OF ALGORITHMS, TELEMETRY), NANOTECHNOLOGY (NANOSCIENCE, BIOMIMETICS, DRUG DELIVERY SYSTEMS, DRUG BIOAVAILABILITY, MICROARRAY/COMBINATORIAL TECHNOLOGY, GENETIC ENGINEERING, COMPUTER SCIENCE, TECHNOLOGY ASSESSMENT), BIOINFORMATICS (COMPUTER SCIENCE, INFORMATION SCIENCE, MATHEMATICS, BIOMECHANICS, COMPUTATIONAL MODELING AND SIMULATION, REMOTE DIAGNOSIS AND THERAPY), IMAGING DEVICE DEVELOPMENT, BIOMEDICAL IMAGING TECHNOLOGY DEVELOPMENT, IMAGE EXPLOITATION, CONTRAST AGENTS, INFORMATICS AND COMPUTER SCIENCES RELATED TO IMAGING, MOLECULAR AND CELLULAR IMAGING, BIOELECTRICS/BIOMAGNETICS, ORGAN AND WHOLE BODY IMAGING, SCREENING FOR DISEASES AND DISORDERS, AND IMAGING TECHNOLOGY ASSESSMENT AND SURGERY (TECHNIQUE DEVELOPMENT AND TECHNOLOGY DEVELOPMENT).
Grant Program (CFDA)
Awarding / Funding Agency
Place of Performance
Tucson,
Arizona
857240001
United States
Geographic Scope
Single Zip Code
University Of Arizona was awarded
Cooperative Agreement UH3EB034686
worth $898,546
from the National Institute of Biomedical Imaging and Bioengineering in August 2023 with work to be completed primarily in Tucson Arizona United States.
The grant
has a duration of 5 years and
was awarded through assistance program 93.286 Discovery and Applied Research for Technological Innovations to Improve Human Health.
The Cooperative Agreement was awarded through grant opportunity BRAIN Initiative: Transformative Brain Non-invasive Imaging Technology Development (UG3/UH3 Clinical Trial Not Allowed).
Status
(Ongoing)
Last Modified 8/20/25
Period of Performance
8/18/23
Start Date
7/31/28
End Date
Funding Split
$898.5K
Federal Obligation
$0.0
Non-Federal Obligation
$898.5K
Total Obligated
Activity Timeline
Additional Detail
Award ID FAIN
UH3EB034686
SAI Number
UH3EB034686-1369008039
Award ID URI
SAI UNAVAILABLE
Awardee Classifications
Public/State Controlled Institution Of Higher Education
Awarding Office
75N800 NIH National Institute of Biomedical Imaging and Bioengineering
Funding Office
75N800 NIH National Institute of Biomedical Imaging and Bioengineering
Awardee UEI
ED44Y3W6P7B9
Awardee CAGE
0LJH3
Performance District
AZ-07
Senators
Kyrsten Sinema
Mark Kelly
Mark Kelly
Modified: 8/20/25