Title page for ETD etd-02062013-040221
|Type of Document
||Model for precise detection of bone edges
||Master of Science
|Barber, Donald L.
|Ehrich, Robert W.
|Tront, Joseph G.
|Yu, Kai Bor
|Date of Defense
A mathematical model which is used to detect bone edges accurately is described
in this thesis. This model is derived by assuming the X-ray source to be
a square region. It is shown that for an ideal X-ray source (point source), the
bone edge lies exactly at the location of maximum first derivative of the imaged
object’s transmission function. However, for the non-ideal case, it is shown that
the bone edge does not lie at the maximum first derivative location. Also, it is
shown that an offset can be calculated from the edge parameters. The Marr-
Hildreth edge detector is used to detect the initial estimates for edge location.
Precise estimates are obtained by using the facet model. The offset is then cal-
V culated and applied to these estimates.
|| Approximate Download Time
| 28.8 Modem
|| 56K Modem
|| ISDN (64 Kb)
|| ISDN (128 Kb)
|| Higher-speed Access
next to an author's name indicates that all
files or directories associated with their ETD
are accessible from the Virginia Tech campus network only.
If you have questions or technical
problems, please Contact DLA.