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Development of a combined Gamma/Positron system for molecular imaging of the human brain at sub-500 micron spatial resolution

Award Number: UG3EB034686
ORGANIZATION: NATIONAL INSTITUTE Of BIOMEDICAL IMAGING & BIOENGINEERING
OPDIV: NIH
AWARD CLASS: COOPERATIVE AGREEMENT
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 08/18/2023
PERIOD OF PERFORMANCE END DATE: 07/31/2025

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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.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2026 ( Subtotal = $0 )
2026	2024	UNIVERSITY OF ARIZONA	845 N PARK AVE RM 538	TUCSON	AZ	85721	PIMA	USA	Discovery and Applied Research for Technological Innovations to Improve Human Health	000	2	12/3/2025	NON-COMPETING CONTINUATION	$0
														Subtotal = $0

Issue Date FY: 2024 ( Subtotal = $407,636 )
2024	2024	UNIVERSITY OF ARIZONA	845 N PARK AVE RM 538	TUCSON	AZ	85721	PIMA	USA	Discovery and Applied Research for Technological Innovations to Improve Human Health	000	2	8/16/2024	NON-COMPETING CONTINUATION	$407,636
2024	2023	UNIVERSITY OF ARIZONA	845 N PARK AVE RM 538	TUCSON	AZ	85721	PIMA	USA	Discovery and Applied Research for Technological Innovations to Improve Human Health	001	1	8/19/2024	NEW	$0
														Subtotal = $407,636

Issue Date FY: 2023 ( Subtotal = $432,164 )
2023	2023	UNIVERSITY OF ARIZONA	845 N PARK AVE RM 538	TUCSON	AZ	85721	PIMA	USA	Discovery and Applied Research for Technological Innovations to Improve Human Health	000	1	8/18/2023	NEW	$432,164
2023	2023	UNIVERSITY OF ARIZONA	845 N PARK AVE RM 538	TUCSON	AZ	85721	PIMA	USA	Discovery and Applied Research for Technological Innovations to Improve Human Health	002	1	9/29/2023	NEW	$0
2023	2023	UNIVERSITY OF ARIZONA	845 N PARK AVE RM 538	TUCSON	AZ	85721	PIMA	USA	Discovery and Applied Research for Technological Innovations to Improve Human Health	001	1	8/23/2023	NEW	$0
														Subtotal = $432,164

Grand Total All Awards = $839,800

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Development of a combined Gamma/Positron system for molecular imaging of the human brain at sub-500 micron spatial resolution

Award Number: UG3EB034686

ORGANIZATION: NATIONAL INSTITUTE Of BIOMEDICAL IMAGING & BIOENGINEERING

OPDIV: NIH

AWARD CLASS: COOPERATIVE AGREEMENT

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

PERIOD OF PERFORMANCE START DATE: 08/18/2023

PERIOD OF PERFORMANCE END DATE: 07/31/2025

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