PubMed | inviCRO LLC, Solidscape Inc., University of Pennsylvania and Harvard University
Type: Journal Article | Journal: Medical physics | Year: 2016
One approach to preclinical single-photon emission computed tomography (SPECT) imaging that provides both high resolution and high sensitivity is based on imaging a mouse inside a collimating tube; many magnified pinhole projection images from a small target region, e.g., the heart, can be recorded simultaneously on multiple detectors with little multiplexing since each pinhole apertures opening angle is restricted to view mostly the target organ. However, to obtain complete data for reconstruction, it may be necessary to scan the mouse through the target region of the tube. The authors are developing a different approach based on acquisition and reconstruction of both low-resolution and high-resolution projection data acquired sequentially through many pinholes embedded in two tungsten tube sections of different diameters, a scout section and a high-resolution section, placed end-to-end along the axis of a triple-head clinical SPECT scanner. This paper describes the design procedures used to determine the geometric parameters of two new collimator-tube sections, as well as one approach for joint reconstruction of data acquired from both sections.The high-resolution section was designed by projecting as many pinhole views of a simulated mouse heart as possible over each detectors camera, with no overlapping of heart projections and minimal overlapping between adjacent hot organ and cardiac projections. The authors then jointly optimized the geometric design of the scout section for a triple-detector camera system, as well as the number of maximum-likelihood expectation maximization (MLEM) iterations required to provide minimum mean-squared error of reconstructed voxel counts throughout a 7-cm axial range, with the constraints of fixed, 2.4-mm scout system resolution at the tube center for all apertures, limited multiplexing, and no detector motion. Simulated mouse projection data from both tube sections were then reconstructed to illustrate a simple approach for using high-resolution data to improve the whole-body scout images within a cylindrical region surrounding the heart.The 2-cm-inner-radius high-resolution tube section accommodated 87 platinum-iridium pinhole inserts, each with a 0.3-mm square aperture; their radial distances from the centerline of the system ranged from 2.2 to 3.0 cm. The optimal radial distance to the closest scout pinhole and optimal number of MLEM iterations were 4.4 cm and 35 iterations, respectively, and the radial distances of the 39 scout pinholes ranged from 4.4 to 4.8 cm; aperture sizes ranged from 1.1 to 1.7 mm transaxially and 0.9-1.5 mm axially. After including data from the high-resolution section viewing the heart region into whole-body mouse reconstructions from scout data, the authors obtained high-resolution images of the heart, embedded within lower resolution images of the body, with minimal artifacts.The authors have optimized a dual-resolution collimator tube that provides both whole-body projections of a mouse and more targeted projections centered on the heart that can be jointly reconstructed to obtain high-resolution images of the heart embedded within lower-resolution whole-body images.
Hoppin J.,InviCRO LLC |
Orcutt K.D.,Beth Israel Deaconess Medical Center |
Hesterman J.Y.,InviCRO LLC |
Silva M.D.,Millennium Pharmaceuticals Inc. |
And 3 more authors.
Journal of Pharmacology and Experimental Therapeutics | Year: 2011
Recent advances in small-animal molecular imaging instrumentation combined with well characterized antibody-labeling chemistry have enabled detailed in vivo measurements of antibody distribution in mouse models. This article reviews the strengths and limitations of in vivo antibody imaging methods with a focus on positron emission tomography and singlephoton emission computed tomography and a brief discussion of the role of optical imaging in this application. A description of the basic principles behind the imaging techniques is provided along with a discussion of radiolabeling methods relevant to antibodies. Practical considerations of study design and execution are presented through a discussion of sensitivity and resolution tradeoffs for these techniques as defined by modality, signaling probe (isotope or fluorophore) selection, labeling method, and radiation dosimetry. Images and analysis results from a case study are presented with a discussion of output data content and relevant informatics gained with this approach to studying antibody pharmacokinetics. Copyright © 2011 by The American Society for Pharmacology and Experimental Therapeutics.
inviCRO LLC and Curadel LLC | Date: 2016-08-31
In one embodiment, a fluorescence histo-tomography (FHT) system is disclosed. The FHT system includes a housing, a fluorescence camera located within the housing, a white light camera located within the housing, and a fluorescence light source located within the housing. The FHT system further includes a support mount configured to support the housing within a chamber of a slicing apparatus such that the cameras and fluorescence light source are aimed towards a block face of a tissue specimen retained within the chamber.
Millennium Pharmaceuticals Inc., Invicro Llc, University of Iowa and Stc.Unm | Date: 2014-12-03
This disclosure provides radiolabeled compounds that bind to guanylyl cyclase C (GCC) and which can bind cancer cells that express GCC. Exemplary compounds comprise a chelating moiety capable of binding a radioactive atom, a peptide capable of binding GCC, and a linker moiety connecting the two. This disclosure also provides methods of detecting and treating cancer using the compounds described herein.
University of Arizona and inviCRO LLC | Date: 2015-02-03
The present invention provides methods and systems for 3D imaging of in vivo and ex vivo tissues. The disclosed systems and methods employ an autoradiographic approach where particles emitted by a radioactive composition within the tissue are detected. Once detected, a 3D representation of the source of particles within the tissue is reconstructed for viewing and analysis.
Invicro Llc | Date: 2011-12-08
A method is provided for estimating a parameter of physiological significance. One or more images are provided of a tissue in a subject to whom a dose of a contrast agent (CA) has been administered, using a computer equipped with image processing software, the concentration or relative concentration of the agent in a region or regions of interest in the tissue is determined, thus generating concentration data. The time-based behavior of concentrations of CA within the tissue is determined using a pharmacokinetic model that is based on a set of pharmacokinetic model parameters. Using computer code, the pharmacokinetic model is fit to the concentration data, varying one or more parameters, such that a best fit estimate of a parameter of physiological significance is provided.
inviCRO LLC | Date: 2013-01-08
inviCRO LLC | Date: 2010-03-09
Invicro Llc | Date: 2013-06-07
A method of estimating a parameter of physiological significance in the central nervous system (CNS) is provided. The method comprises (a) providing one or more images of the brain or cerebral spinal fluid (CSF) in a subject to whom a dose of a contrast agent (CA) has been administered; (b) determining, using a computer equipped with image processing software, the concentration or relative concentration of the agent in a region or regions of interest in the brain or CSF, thereby generating concentration data; (c) describing the time-based behavior of concentrations of CA within the brain or CSF using a pharmacokinetic model that is based on a set of pharmacokinetic model parameters; and (d) fitting, using computer code, the pharmacokinetic model to the concentration data, varying one or more parameters, wherein the best fit estimates a parameter of physiological significance in the CNS.
inviCRO LLC | Date: 2016-05-19
Disclosed is a computer-implemented method of creating an image of a specimen including receiving a first image of a first section of a specimen created using a first wavelength of invisible light a second image of a second section of the specimen adjacent to the first section and the second image created using the first wavelength of invisible light, co-registering the first image and the second image and creating, by the processor, a single-plane image of the first section using a next-image process.