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Sökning: WFRF:(Lundell M)

  • Resultat 71-80 av 231
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72.
  • Silva, R., et al. (författare)
  • Validating dilute settling suspensions numerical data through MRI, UVP and EIT measurements
  • 2016
  • Ingår i: Flow Measurement and Instrumentation. - : Elsevier. - 0955-5986 .- 1873-6998. ; 50, s. 35-48
  • Tidskriftsartikel (refereegranskat)abstract
    • The measurement of fluid dynamic quantities are of great interest both for extending the range of validity of current correlations to be used in equipment design and for verification of fundamental hydrodynamic models. Studies where comparisons are made between imaging techniques serve to provide confidence on the validity of each technique for the study of multiphase flow systems. The advantage of cross-validation is that it can help establish the limitations of each technique and the necessary steps towards improvement. A small amount of comparative studies are found in the literature and none of them reports the study of settling particles suspension flow using simultaneously Ultrasonic Velocity Profiling (UVP), Magnetic Resonance Imaging (MRI) and Electrical Impedance Tomography (EIT), at least not to the best of the authors knowledge. In the present paper the authors report efforts made on the characterization of dilute suspensions of glass particles in turbulent flow, with increasing flow velocities and particles concentrations, in a pilot rig at a laboratorial scale, using both MRI, EIT and UVP: direct comparisons of EIT, MRI and UVP measurements acquired and mixture model numerical simulations are presented and the level of agreement explored.
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  • Tsai, JA, et al. (författare)
  • Hybrid SPECT/CT imaging of sentinel nodes in esophageal cancer: first results
  • 2013
  • Ingår i: Acta radiologica (Stockholm, Sweden : 1987). - : SAGE Publications. - 1600-0455 .- 0284-1851. ; 54:4, s. 369-373
  • Tidskriftsartikel (refereegranskat)abstract
    • Sentinel node (SN) biopsy in esophageal cancer has the potential of becoming an important tool for ruling out the presence of lymph node metastases in patients opted for less extensive surgery without neoadjuvant treatment. Purpose To investigate preoperative SN imaging in esophageal cancer using hybrid single photon emission computed tomography (SPECT)/CT. Material and Methods Eight patients with esophageal cancer scheduled for thoracoabdominal esophagectomy after neoadjuvant treatment, underwent endoscopic submucosal injection of 99mTc-nanocoll the day before surgery, followed by imaging with SPECT/CT for preoperative detection. Intraoperative detection of SNs was performed with a gamma probe. Results SNs were identified by SPECT/CT in 7/8 cases (88%) and by gamma probe in all cases. The median number of identified lymph node stations with SN in the operating field was 1 (range 0–2) for SPECT/CT and 1 (range 1–3) for gamma probe. The median distance between the perceived location of the respective SN according to SPECT/CT and the location identified with the gamma probe was <5 mm (range <5–15 mm). In one patient who had a complete histologic response to neoadjuvant treatment in the primary tumor, there was one single metastasis that was not contained in one of the SNs. Conclusion Preoperative identification of sentinel nodes with hybrid SPECT/CT after endoscopic injection of radiocolloid is a technique with obvious potential for SN mapping in esophageal cancer.
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