Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Domain | Definition |
Health | A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image. (references) |
Source: compiled by the editor from various references; see credits. | |
Hexadecimal (or equivalents, 770AD-1900s) (references)54 4F 4D 4F 47 52 41 50 48 59 2C 45 4D 49 53 53 49 4F 4E 2D 43 4F 4D 50 55 54 45 44 2C 53 49 4E 47 4C 45 2D 50 48 4F 54 4F 4E |
| Leonardo da Vinci (1452-1519; backwards) (references)
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Binary Code (1918-1938, probably earlier) (references)01010100 01001111 01001101 01001111 01000111 01010010 01000001 01010000 01001000 01011001 00101100 00100000 01000101 01001101 01001001 01010011 01010011 01001001 01001111 01001110 00101101 01000011 01001111 01001101 01010000 01010101 01010100 01000101 01000100 00101100 00100000 01010011 01001001 01001110 01000111 01001100 01000101 00101101 01010000 01001000 01001111 01010100 01001111 01001110 |
HTML Code (1990) (references)T O M O G R A P H Y ,   E M I S S I O N - C O M P U T E D ,   S I N G L E - P H O T O N |
ISO 10646 (1991-1993) (references)0054 004F 004D 004F 0047 0052 0041 0050 0048 0059 002C 0045 004D 0049 0053 0053 0049 004F 004E 002D 0043 004F 004D 0050 0055 0054 0045 0044 002C 0053 0049 004E 0047 004C 0045 002D 0050 0048 004F 0054 004F 004E |
Encryption (beginner's substitution cypher): (references)54494749415235504259142394743535343494815374947505554393814253434841463915504249544948 |
| 1. Orthography 2. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
