A form of this technique measures neutron absorbance with arrays of scintillators to determine the densities and fissile masses of layers of the test object. For 10 points each:
[10m] Name this class of imaging techniques used to study the internal structure of objects by “stacking” 2D transmission cross sections.
ANSWER: tomography (“tuh-MAH-grah-fee”) [accept any form of tomography, such as computed tomography scans, computed axial tomography scans, positron emission tomography, neutron tomography, X-ray tomography, or electron tomography; prompt on PET or CT or CAT scan by asking “what does that stand for?”; prompt on scans or scanning]
[10e] Tomographic reconstruction is an inverse problem that tries to find a 2D image given the results of performing this operation on the image many times. This operation maps an object to one less dimension, such as representing a 3D object on a flat surface.
ANSWER: projection [or projecting or other word forms of project]
[10h] This term is used for any image used to test tomographic reconstruction algorithms, such as the image of 10 overlayed ellipses introduced by Lawrence Shepp and Benjamin Logan.
ANSWER: phantom [accept Shepp–Logan phantom]
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