3DVisualization-2011

3DVisualization-2011 - 3D Computer Visualization Andres...

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3D Computer Visualization Andres Kriete School of Biomedical Engineering, Science and Health Systems
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Content Instrumentation Surface Rendering Volume Rendering Volume vs. Surface Rendering Modeling and Simulation
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The Visible Human In 1989, the National Library of Medicine (NLM) began an ambitious project to create a digital atlas of the human anatomy. The NLM Planning Panel on Electronic Image Libraries recommended a project to create XRAY Computed Tomography (XRAY-CT), Magnetic Resonance Imaging (MRI) and physical sections of a human cadaver. The project is called "The Visible Man." Another cadaver, that of a 59 year-old woman, "The Visible Woman", was released later. The Visible Woman The data is from a 59-year-old Maryland woman who willed her body to science. The fresh computed tomography data was acquired with varying in-slice resolution, each slice 1 mm apart. The physical cross-section data has the same .3 mm in-slice resolution, but, in contrast to the Visible Man's 1mm slice thickness, her slices are .3 mm apart.
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First Generation CT Scanner Acquire a projection (X-ray) Translate x-ray pencil beam and detector across body and record output Rotate to next angle Repeat translation Assemble all the projections.
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Modern CT Scanner From Webb, Physics of Medical Imaging
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Computerized Tomography (CT), continued Early CT Image Current technology
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Hounsfield Scale Definition The radiodensity of distilled water at standard pressure and temperature (STP) is defined as zero Hounsfield units (HU). The radiodensity of air at STP is defined as -1000 HU. The standards were chosen as they are universally available references and suited to the key application for which computed axial tomography was developed: imaging the internal anatomy of living creatures based on organized water structures and mostly living in air, e.g. humans. The HU of common substances Substance HU Air -1000 (dark) Fat -120 Water 0 Muscle +40 Bone +1000 (white)
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Exhalation Inhalation
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2-D => 3-D pixel => voxel
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Instrumentation/Software Intel (Win95/98/NT/2000) MAC Unix (Linux,SGI,SUN,DEC) PCs, Workstations, Servers Microscope vendors Commercial software Freeware Libraries
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Ready-to-go 1) Use ready-to-go, off-the-shelf systems, consisting of hard- and software: Examples include 2-D image processing systems such as the KSM systems of Carl Zeiss Vision, similar systems are available from Leica, Biorad and other microscope vendors. For inspections of medical images there are viewing stations available
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This note was uploaded on 07/08/2011 for the course BM 501 taught by Professor Kop during the Spring '11 term at Bloomsburg.

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3DVisualization-2011 - 3D Computer Visualization Andres...

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