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Comparison Of Gmaw And Saw For Ngw Of 50 Mm Q&T Steel Plate, Druce Patrick Dunne, Willy Pang
Comparison Of Gmaw And Saw For Ngw Of 50 Mm Q&T Steel Plate, Druce Patrick Dunne, Willy Pang
Faculty of Engineering and Information Sciences - Papers: Part B
A one-pass-per-layer technique was used for narrow gap welding (NGW) of 50 mm thick plate of quenched and tempered steel with 690 MPa minimum yield strength. GMAW and SAW were investigated for pulsed and non-pulsed welding using the same 1.2 mm strength-matching welding consumable and the same nominal heat inputs for each of the pulsed and non-pulsed welds. The welds were defect-free and the hardness, tensile strength and Charpy impact energies were generally consistent with high weldment integrity. Pulsing of the welding current had the effect of slightly increasing side-wall fusion, flattening the weld bead and decreasing its volume. The …
Comparison Of Four Dimensional Computed Tomography And Magnetic Resonance Imaging In Abdominal Radiotherapy Planning, A Oar, Gary P. Liney, Robba Rai, Shrikant Deshpande, Li Pan, Meredith Johnston, Michael G. Jameson, Shivani Kumar, Mark T. Lee
Comparison Of Four Dimensional Computed Tomography And Magnetic Resonance Imaging In Abdominal Radiotherapy Planning, A Oar, Gary P. Liney, Robba Rai, Shrikant Deshpande, Li Pan, Meredith Johnston, Michael G. Jameson, Shivani Kumar, Mark T. Lee
Faculty of Engineering and Information Sciences - Papers: Part B
Background and Purpose: Four-dimensional (4D) computed tomography (CT) is widely used in radiotherapy (RT) planning and remains the current standard for motion evaluation. We assess a 4D magnetic resonance imaging (MRI) sequence in terms of motion and image quality in a phantom, healthy volunteers and patients undergoing RT. Materials and Methods: The 4D-MRI sequence is a prototype T1-weighted 3D gradient echo with radial acquisition with self-gating. The accuracy of the 4D-MRI respiratory sorting based method was assessed using a MRICT compatible respiratory simulation phantom. In volunteers, abdominal viscera were evaluated for artefact, noise, structure delineation and overall image quality using …