• Characterization of vasskveite (water halibut) syndrome for automated detection 

      Ortega, Samuel; Ofstad, Ragni; Syed, Shaheen; Kranz, Mathias; Heia, Karsten; Anderssen, Kathryn Elizabeth (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-23)
      In recent years, cases of vasskveite (water halibut) syndrome in halibut have been increasing. At the moment, there exists no way to screen for the syndrome immediately after capture, which is problematic for both exporters and purchasers. In this article, we compared good quality halibut and halibut exhibiting the syndrome using a variety of techniques. Hyperspectral imaging was used to quantify ...
    • Development of 8f-labeled radiotracers for pet imaging of the adenosine a2a receptor: Synthesis, radiolabeling and preliminary biological evaluation 

      Lai, Thu Hang; Schröder, Susann; Toussaint, Magali; Dukić-Stefanović, Sladjana; Kranz, Mathias; Ludwig, Friedrich-Alexander; Fischer, Steffen; Steinbach, Jörg; Deuther-Conrad, Winnie; Brust, Peter; Moldovan, Rareş-Petru (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-25)
      The adenosine A<sub>2A</sub> receptor (A<sub>2A</sub>R) represents a potential therapeutic target for neurodegenerative diseases. Aiming at the development of a positron emission tomography (PET) radiotracer to monitor changes of receptor density and/or occupancy during the A<sub>2A</sub>R-tailored therapy, we designed a library of fluorinated analogs based on a recently published lead compound ...
    • Diffusion tensor imaging for spatially-resolved characterization of muscle fiber structure in seafood 

      Anderssen, Kathryn Elizabeth; Kranz, Mathias; Syed, Shaheen; Stormo, Svein Kristian (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-08)
      The fiber structure of tissue in meat and seafood has a significant impact on their perceived quality. However, quantifiable description of muscle structure is challenging. We investigate diffusion tensor imaging (DTI) magnetic resonance imaging (MRI) as a method to quantitatively describe tissue structure. DTI measures the anisotropy of water molecule diffusion within muscle fibers. A pilot study ...
    • Diffusion tensor imaging for spatially-resolved characterization of muscle fiber structure in seafood 

      Anderssen, Kathryn Elizabeth; Kranz, Mathias; Syed, Shaheen; Stormo, Svein Kristian (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-08)
      The fiber structure of tissue in meat and seafood has a significant impact on their perceived quality. However, quantifiable description of muscle structure is challenging. We investigate diffusion tensor imaging (DTI) magnetic resonance imaging (MRI) as a method to quantitatively describe tissue structure. DTI measures the anisotropy of water molecule diffusion within muscle fibers. A pilot study ...
    • Glioblastoma PET/MRI: kinetic investigation of [<sup>18</sup>F]rhPSMA-7.3, [<sup>18</sup>F]FET and [<sup>18</sup>F]fluciclovine in an orthotopic mouse model of cancer 

      Lindemann, Marcel; Oteiza, Ana; Martin-Armas, Montserrat; Guttormsen, Yngve; Moldes-Anaya, Angel; Berzaghi, Rodrigo; Bogsrud, Trond; Bach-Gansmo, Tore; Sundset, Rune; Kranz, Mathias (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-22)
      <b><p>Purpose</b> Glioblastoma multiforme (GBM) is the most common glioma and standard therapies can only slightly prolong the survival. Neo-vascularization is a potential target to image tumor microenvironment, as it defines its brain invasion. We investigate [<sup>18</sup>F]rhPSMA-7.3 with PET/MRI for quantitative imaging of neo-vascularization in GBM bearing mice and human tumor tissue and compare ...
    • Magnetic resonance imaging for non-invasive measurement of plastic ingestion in marine wildlife 

      Anderssen, Kathryn Elizabeth; Gabrielsen, Geir W.; Kranz, Mathias; Collard, France (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-17)
      Monitoring plastic ingestion by marine wildlife is important for both characterizing the extent of plastic pollution in the environment and understanding its effect on species and ecosystems. Current methods to detect plastic in the digestive system of animals are slow and invasive, such that the number of animals that can be screened is limited. In this article, magnetic resonance imaging (MRI) ...
    • The marine natural product mimic MPM-1 is cytolytic and induces DAMP release from human cancer cell lines 

      von Hofsten, Susannah; Paulsen, Marianne Hagensen; Magnussen, Synnøve; Ausbacher, Dominik; Kranz, Mathias; Bayer, Annette; Strøm, Morten Bøhmer; Berge, Gerd (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-16)
      Bioprospecting contributes to the discovery of new molecules with anticancer properties. Compounds with cytolytic activity and the ability to induce immunogenic cell death can be administered as intratumoral injections with the aim to activate anti-tumor immune responses by causing the release of tumor antigens as well as damage-associated molecular patterns (DAMPs) from dying cancer cells. In ...
    • PET imaging of the adenosine A2A receptor in the rotenone-based mouse model of Parkinson’s disease with [18F]FESCH synthesized by a simplified two-step one-pot radiolabeling strategy 

      Schröder, Susann; Lai, Thu Hang; Toussaint, Magali; Kranz, Mathias; Chovsepian, Alexandra; Shang, Qi; Dukić-Stefanović, Sladjana; Deuther-Conrad, Winnie; Teodoro, Rodrigo; Wenzel, Barbara; Moldovan, Rareş-Petru; Pan-Montojo, Francisco; Brust, Peter (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-02)
      The adenosine A<sub>2A</sub> receptor (A<sub>2A</sub>R) is regarded as a particularly appropriate target for non-dopaminergic treatment of Parkinson’s disease (PD). An increased A<sub>2A</sub>R availability has been found in the human striatum at early stages of PD and in patients with PD and dyskinesias. The aim of this small animal positron emission tomography/magnetic resonance (PET/MR) imaging ...
    • Preclinical incorporation dosimetry of [18F]FACH—A novel 18F-labeled MCT1/MCT4 lactate transporter inhibitor for imaging cancer metabolism with PET 

      Sattler, Bernhard; Kranz, Mathias; Wenzel, Barbara; Jain, Nalin T.; Moldovan, Rareş-Petru; Toussaint, Magali; Deuther-Conrad, Winnie; Ludwig, Friedrich-Alexander; Teodoro, Rodrigo; Sattler, Tatjana; Sadeghzadeh, Masoud; Sabri, Osama; Brust, Peter (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-26)
      Overexpression of monocarboxylate transporters (MCTs) has been shown for a variety of human cancers (e.g., colon, brain, breast, and kidney) and inhibition resulted in intracellular lactate accumulation, acidosis, and cell death. Thus, MCTs are promising targets to investigate tumor cancer metabolism with positron emission tomography (PET). Here, the organ doses (ODs) and the effective dose (ED) of ...
    • Radiosynthesis and biological investigation of a novel fluorine-18 labeled benzoimidazotriazine- based radioligand for the imaging of phosphodiesterase 2A with positron emission tomography 

      Ritawidya, Rien; Wenzel, Barbara; Teodoro, Rodrigo; Toussaint, Magali; Kranz, Mathias; Deuther-Conrad, Winnie; Dukić-Stefanović, Sladjana; Ludwig, Friedrich-Alexander; Scheunemann, Matthias; Brust, Peter (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-15)
      A specific radioligand for the imaging of cyclic nucleotide phosphodiesterase 2A (PDE2A) via positron emission tomography (PET) would be helpful for research on the physiology and disease-related changes in the expression of this enzyme in the brain. In this report, the radiosynthesis of a novel PDE2A radioligand and the subsequent biological evaluation were described. Our prospective compound ...
    • Sigma-1 receptor positron emission tomography: A new molecular imaging approach using (S)-(-)-[18F]fluspidine in glioblastoma 

      Toussaint, Magali; Deuther-Conrad, Winnie; Kranz, Mathias; Fischer, Steffen; Ludwig, Friedrich-Alexander; Juratli, Tareq A.; Patt, Marianne; Wünsch, Bernhard; Schackert, Gabriele; Sabri, Osama; Brust, Peter (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-06)
      Glioblastoma multiforme (GBM) is the most devastating primary brain tumour characterised by infiltrative growth and resistance to therapies. According to recent research, the sigma-1 receptor (sig1R), an endoplasmic reticulum chaperone protein, is involved in signaling pathways assumed to control the proliferation of cancer cells and thus could serve as candidate for molecular characterisation of ...
    • Synthesis and biological evaluation of a novel 18F-labeled radiotracer for PET imaging of the adenosine A2A receptor 

      Lai, Thu Hang; Toussaint, Magali; Teodoro, Rodrigo; Dukić-Stefanović, Sladjana; Kranz, Mathias; Deuther-Conrad, Winnie; Moldovan, Rareş-Petru; Brust, Peter (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-25)
      The adenosine A<sub>2A</sub> receptor (A<sub>2A</sub>R) has emerged as a potential non-dopaminergic target for the treatment of Parkinson’s disease and, thus, the non-invasive imaging with positron emission tomography (PET) is of utmost importance to monitor the receptor expression and occupancy during an A<sub>2A</sub>R-tailored therapy. Aiming at the development of a PET radiotracer, we herein ...
    • Weakly supervised semantic segmentation for MRI: exploring the advantages and disadvantages of class activation maps for biological image segmentation with soft boundaries 

      Syed, Shaheen; Anderssen, Kathryn Elizabeth; Stormo, Svein Kristian; Kranz, Mathias (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-13)
      Fully supervised semantic segmentation models require pixel-level annotations that are costly to obtain. As a remedy, weakly supervised semantic segmentation has been proposed, where image-level labels and class activation maps (CAM) can detect discriminative regions for specific class objects. In this paper, we evaluated several CAM methods applied to different convolutional neural networks (CNN) ...