Traditional Posters: Body Imaging
Yüklə 458,11 Kb.
|
| Bahman Kasmai1, Paul Napier Malcolm1, Andoni Paul Toms1, Andrew Brian Gill2
1Radiology, Norfolk & Norwich University Hospitals NHS Trust, Norwich, Norfolk, United Kingdom; 2Radiology, Papworth Hospital NHS Foundation Trust, Cambridge, Cambridgeshire The aim of this work was to develop a software tool for validation, evaluation and integrity checks of in-house and commercial MRI iron overload systems. A windows-based software application, called SOFGEN, written in C# and based on Microsoft .NET framework generates a sets of fully Dicom compliant images from a set of user supplied parameters and decay model, for testing of Dicom compliant MRI T2(*) assessment software. The SOFGEN generated phantoms were successfully used to evaluate a number of in-house developed T2(*) assessment software and is available free via email request to authors. 2611. Effects of Posprandial State and Mesenteric Blood Flow on the Repeatability of Magnetic Resonance Elastography Catherine D. G. Hines1, Mary J. Lindstrom2, Scott B. Reeder1,3 1Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, United States; 2Biostatistics and Medical Informatics, University of Wisconsin-Madison, Madison, WI, United States; 3Radiology, University of Wisconsin-Madison, Madison, WI, United States Blood flow and fasting status are recognized sources of variability in MRE measurements, and their impact on the repeatability of MRE is evaluated. MRE stiffness values and flow through the superior mesenteric vein were measured in twelve healthy volunteers in fasted and fed states, and the sequences were repeated five weeks later. No significant differences between fasted/fed state stiffness values and no correlation between values and measured flow are seen. Overall, volunteers scanned in a known fasted or fed state provide very repeatable MRE stiffness values, where the standard deviation of one MRE exam is 8.5% or 9.0% for fasted and fed states, respectively. 2612. Three-Dimensional MRCP with Reduced RF Power Deposition John P. Mugler, III1, Wilhelm Horger2, Berthold Kiefer2 1Radiology, University of Virginia, Charlottesville, VA, United States; 2Siemens Healthcare, Erlangen, Germany This work explored two approaches for reducing the RF power deposition of MRCP imaging based on a turbo-spin-echo pulse sequence. An adiabatic T2 preparation applied just before the excitation RF pulse, or a very long first echo spacing, combined with partial-Fourier acquisition permitted power deposition to be reduced by 25%-40% compared to that for a standard MRCP pulse sequence, while providing image quality comparable to that for the standard method. These methods will be valuable for addressing power-deposition limitations of MRCP at 3T, and will permit more consistent MRCP image quality to be achieved. 2613. T2-Weighted Body Imaging with PROPELLER Using Parallel Imaging with Across Blade Calibration James H. Holmes1, Philip J. Beatty2, Scott B. Reeder3,4, Zhiqiang Li5, Reed F. Busse1, Ajeetkumar Gaddipati6, Jean H. Brittain1 1Applied Science Laboratory, GE Healthcare, Madison, WI, United States; 2Applied Science Laboratory, GE Healthcare, Menlo Park, CA; 3Radiology, University of Wisconsin-Madison, Madison, WI, United States; 4Medical Physics, University of Wisconsin-Madison, Madison, WI, United States; 5GE Healthcare, Phoenix, AZ; 6GE Healthcare, Waukesha, WI, United States This work demonstrates the application of a shared calibration scheme for autocalibrated parallel imaging to enable greater blade acceleration for abdominal PROPELLER. The shared calibration method uses external calibration data as well as a small amount of internal calibration data per blade. The technique is shown to improve robustness to motion for free-breathing T2-weighted abdominal body imaging. Results were found to compare favorably to respiratory-gated Cartesian exams suggesting that the PROPELLER approach may allow robust imaging in individuals where respiratory gating is not effective. 2614. Balanced MR Cholangiopancreatography with Motion-Sensitized Driven-Equilibrium (MSDE): Feasibility and Optimization of Imaging Parameter Tomohiro Nakayama1, Takashi Yoshiura1, Yukihisa Takayama1, Eiki Nagao1, Tsuyoshi Tajima1, Akihiro Nishie1, Yoshiki Asayama1, Kousei Ishigami1, Daisuke Kakihara1, Daisuke Okamoto1, Hiroshi Honda1, Tomoyuki Okuaki2 1Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; 2Philips Electronics Japan Motion-sensitized driven-equilibrium (MSDE) preparation was added to a balanced SSFP MRCP sequence in order to suppress disturbing high signal intensities from flowing blood in vessels. We performed a volunteer study to determine optimal VENC value for the evaluation of biliary systems. We found the optimum VENC values to be 3 or 5cm/s with best suppression of relative vessel signals to bile ducts. At a lower VENC value (1cm/s), signal of bile duct was reduced likely due to minimal biliary flow. Higher VENC values (> 7cm/s) resulted in failure of vessel signal suppression. 2615. Respiratory Navigator-Triggered, Multi-Slice Turbo Spin Echo with Motion-Sensitized Driven Equilibrium Prepulse: A Novel Sequence for Black-Blood T2-Weighted Imaging of Liver Yüklə 458,11 Kb. Dostları ilə paylaş:
|