####
by A. C. Kak and Malcolm Slaney

Last Update February 4, 2002
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Correction to equation 96 on page 83

When n is odd, the last term in equation 96 should read
g(n alpha) = -1/(2 pi^2 sin^2 (n alpha)).
The other terms are correct.
Thanks to Conway Yee for telling us there was an error and Carl Crawford
for confirming the correction.
####
Correction to Table 3.2 on page 102 (3d Shepp and Logan Parameters)

The original table had two identical rows.
Thanks to Ge Wang <ge@ct.radiology.uiowa.edu>

**Ellipsoid** |
**x** |
**y** |
**z** |
**A** |
**B** |
**C** |
**beta** |
**Gray level** |

a |
0.00 |
0.000 |
0.000 |
0.6900 |
0.920 |
0.900 |
0 |
2.00 |

b |
0.00 |
0.000 |
0.000 |
0.6624 |
0.874 |
0.880 |
0 |
-0.98 |

c |
-0.22 |
0.000 |
-0.250 |
0.4100 |
0.160 |
0.210 |
108 |
-0.02 |

d |
0.22 |
0.000 |
-0.250 |
0.3100 |
0.110 |
0.220 |
72 |
-0.02 |

e |
0.00 |
0.350 |
-0.250 |
0.2100 |
0.250 |
0.500 |
0 |
0.02 |

f |
0.00 |
0.100 |
-0.250 |
0.0460 |
0.046 |
0.046 |
0 |
0.02 |

g |
-0.08 |
-0.650 |
-0.250 |
0.0460 |
0.023 |
0.020 |
0 |
0.01 |

h |
0.06 |
-0.650 |
-0.250 |
0.0460 |
0.023 |
0.020 |
90 |
0.01 |

i |
0.06 |
-0.105 |
0.625 |
0.0560 |
0.040 |
0.100 |
90 |
0.02 |

j |
0.00 |
0.100 |
0.625 |
0.0560 |
0.056 |
0.100 |
0 |
-0.02 |

####
Correction to Iwa75 reference on page 210

At the end of the first (partial) paragraph on page 210
we refer readers to [Iwa75].
The correct references are either:
- B. D. Coleman, "Foundations of linear viscoelasticity,"
*Rev. Mod. Phys., * Vol. 9, pp. 443-450, 1981.
- D. Nahamoo and A. C. Kak, "Ultrasonic Diffraction Imaging,"
Technical Report TR-EE-82-20, School of Electrical Engineering, West
Lafayette, IN, 1982.

Thanks to M. A. Lewis (CWRU) for pointing out this error.