Axial Coordinate - Explore the Science & Experts | ideXlab

Scan Science and Technology

Contact Leading Edge Experts & Companies

Axial Coordinate

The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform

I. Johnson – 1st expert on this subject based on the ideXlab platform

  • wavelength shifter strips and g apd arrays for the read out of the z Coordinate in Axial pet modules
    Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2008
    Co-Authors: Annabel Braem, Enrico Chesi, Christian Joram, Julien Seguinot, Peter Weilhammer, Eduardo Nappi, W. Lustermann, D. Schinzel, A. Rudge, I. Johnson

    Abstract:

    Abstract The measurements presented in this paper are related to the development of a PET camera based on a 3-D Axial geometry with excellent 3-D spatial, timing and energy resolution. The detector modules consist of matrices of long Axially oriented scintillation crystal bars, which are individually coupled to photodetectors. The Axial Coordinate is derived from wavelength shifting (WLS) plastic strips orthogonally interleaved between the crystal bars and readout by G-APD arrays. We report on results from measurements with two LYSO crystal bars, read with PMTs, and two WLS strips readout with G-APD devices from Hamamatsu (called MPPC). The WLS strips are positioned orthogonally underneath the LYSO bars. Yields of about 80 photoelectrons from the WLS strips for an energy deposition in the LYSO crystals equivalent to the absorption of 511 keV photons are observed. The Axial Coordinate in the LYSO bars is reconstructed with a precision of about 1.9 mm (FWHM) using a digital reconstruction method. The resolution of an analog Coordinate reconstruction method, which uses the pulse height measurement from the WLS strips is 2.8 mm (FWHM). This resolution is still compromised by the availability of only two WLS strips and will improve with a full stack of LYSO crystals interleaved with WLS strip arrays, which is presently under development for a PET demonstrator set-up.

  • A Demonstrator for a new Axial PET Concept
    2008 IEEE Nuclear Science Symposium Conference Record, 2008
    Co-Authors: E. Bolle, Annabel Braem, Enrico Chesi, C. Casella, G. Dissertori, N. Clinthorne, E. Cochran, L. Djambazov, K. Honscheid, I. Johnson

    Abstract:

    In PET imaging, improving sensitivity while maintaining very good spatial resolution is crucial. To achieve this goal, we propose a novel concept of PET scanner, with Axially arranged crystals, providing a high sensitivity and a 3D reconstruction of the gamma interaction point. The trans-Axial Coordinate is given by the crystal hit, while the z Coordinate is reconstructed by the weighted distribution of light escaping the crystal and entering into an array of Wave Length Shifting (WLS) strips interleaving the crystal layers. This novel configuration allows full identification of Compton interactions in the crystals that can be included in image reconstruction thus enhancing the sensitivity. We present preliminary results obtained by a small prototype consisting of 4×4 crystals with orthogonally interleaved WLS strips. Experimental data are compared to simulated data.

  • high precision Axial Coordinate readout for an Axial 3 d pet detector module using a wave length shifter strip matrix
    Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2007
    Co-Authors: Annabel Braem, I. Johnson, Enrico Chesi, Christian Joram, Julien Seguinot, Peter Weilhammer, Eduardo Nappi, W. Lustermann, D. Schinzel, D Renker

    Abstract:

    We describe a novel method to extract the Axial Coordinate from a matrix of long Axially oriented crystals, which is based on wavelength shifting plastic strips. The method allows building compact 3-D Axial gamma detector modules for PET scanners with excellent 3-dimensional spatial, timing and energy resolution while keeping the number of readout channels reasonably low. A voxel resolution of about 10 mm 3 is expected. We assess the performance of the method in two independent ways, using classical PMTs and G-APDs to read out the LYSO (LSO) scintillation crystals and the wavelength shifting strips. We

Rongjing Zhang – 2nd expert on this subject based on the ideXlab platform

  • 3D Localization of weak scatterers in Rayleigh-Sommerfeld back-propagation
    Optics Express, 2012
    Co-Authors: Laurence Wilson, Rongjing Zhang

    Abstract:

    The Rayleigh-Sommerfeld back-propagation method is a fast and highly flexible volume reconstruction scheme for digital holographic microscopy. We present a new method for 3D localization of weakly scattering objects using this technique. A well-known aspect of classical optics (the Gouy phase shift) can be used to discriminate between objects lying on either side of the holographic image plane. This results in an unambiguous, model-free measurement of the Axial Coordinate of microscopic samples, and is demonstrated both on an individual colloidal sphere, and on a more complex object—a layer of such particles in close contact.

  • 3D Localization of weak scatterers in digital holographic microscopy using Rayleigh-Sommerfeld back-propagation
    Optics Express, 2012
    Co-Authors: Laurence Wilson, Rongjing Zhang

    Abstract:

    The Rayleigh-Sommerfeld back-propagation method is a fast and highly flexible volume reconstruction scheme for digital holographic microscopy. We present a new method for 3D localization of weakly scattering objects using this technique. A well-known aspect of classical optics (the Gouy phase shift) can be used to discriminate between objects lying on either side of the holographic image plane. This results in an unambiguous, model-free measurement of the Axial Coordinate of microscopic samples, and is demonstrated both on an individual colloidal sphere, and on a more complex object — a layer of such particles in close contact.

Annabel Braem – 3rd expert on this subject based on the ideXlab platform

  • wavelength shifter strips and g apd arrays for the read out of the z Coordinate in Axial pet modules
    Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2008
    Co-Authors: Annabel Braem, Enrico Chesi, Christian Joram, Julien Seguinot, Peter Weilhammer, Eduardo Nappi, W. Lustermann, D. Schinzel, A. Rudge, I. Johnson

    Abstract:

    Abstract The measurements presented in this paper are related to the development of a PET camera based on a 3-D Axial geometry with excellent 3-D spatial, timing and energy resolution. The detector modules consist of matrices of long Axially oriented scintillation crystal bars, which are individually coupled to photodetectors. The Axial Coordinate is derived from wavelength shifting (WLS) plastic strips orthogonally interleaved between the crystal bars and readout by G-APD arrays. We report on results from measurements with two LYSO crystal bars, read with PMTs, and two WLS strips readout with G-APD devices from Hamamatsu (called MPPC). The WLS strips are positioned orthogonally underneath the LYSO bars. Yields of about 80 photoelectrons from the WLS strips for an energy deposition in the LYSO crystals equivalent to the absorption of 511 keV photons are observed. The Axial Coordinate in the LYSO bars is reconstructed with a precision of about 1.9 mm (FWHM) using a digital reconstruction method. The resolution of an analog Coordinate reconstruction method, which uses the pulse height measurement from the WLS strips is 2.8 mm (FWHM). This resolution is still compromised by the availability of only two WLS strips and will improve with a full stack of LYSO crystals interleaved with WLS strip arrays, which is presently under development for a PET demonstrator set-up.

  • A Demonstrator for a new Axial PET Concept
    2008 IEEE Nuclear Science Symposium Conference Record, 2008
    Co-Authors: E. Bolle, Annabel Braem, Enrico Chesi, C. Casella, G. Dissertori, N. Clinthorne, E. Cochran, L. Djambazov, K. Honscheid, I. Johnson

    Abstract:

    In PET imaging, improving sensitivity while maintaining very good spatial resolution is crucial. To achieve this goal, we propose a novel concept of PET scanner, with Axially arranged crystals, providing a high sensitivity and a 3D reconstruction of the gamma interaction point. The trans-Axial Coordinate is given by the crystal hit, while the z Coordinate is reconstructed by the weighted distribution of light escaping the crystal and entering into an array of Wave Length Shifting (WLS) strips interleaving the crystal layers. This novel configuration allows full identification of Compton interactions in the crystals that can be included in image reconstruction thus enhancing the sensitivity. We present preliminary results obtained by a small prototype consisting of 4×4 crystals with orthogonally interleaved WLS strips. Experimental data are compared to simulated data.

  • high precision Axial Coordinate readout for an Axial 3 d pet detector module using a wave length shifter strip matrix
    Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2007
    Co-Authors: Annabel Braem, I. Johnson, Enrico Chesi, Christian Joram, Julien Seguinot, Peter Weilhammer, Eduardo Nappi, W. Lustermann, D. Schinzel, D Renker

    Abstract:

    We describe a novel method to extract the Axial Coordinate from a matrix of long Axially oriented crystals, which is based on wavelength shifting plastic strips. The method allows building compact 3-D Axial gamma detector modules for PET scanners with excellent 3-dimensional spatial, timing and energy resolution while keeping the number of readout channels reasonably low. A voxel resolution of about 10 mm 3 is expected. We assess the performance of the method in two independent ways, using classical PMTs and G-APDs to read out the LYSO (LSO) scintillation crystals and the wavelength shifting strips. We