Biomedical Engineering Reference
In-Depth Information
Table 10.1:
Image file descriptions, where Tx stands for transmission scan,
Em emission scan, Sag sagittal slices, and Axi axial slices
Patient
Modality
Image
Dimension
Voxel (
mm
3
)
Comments
A
MR
Sag
256
2
128
1
0
2
1
5
m,29yr
×
.
×
.
Tx
Axi
64
2
29
7
12
3
×
.
Em
Axi
64
2
29
7
12
3
×
.
B
MR
Sag
256
2
×
128
1
.
0
2
×
1
.
5
m,21yr
Tx
Axi
64
2
×
24
7
.
12
3
64
2
7
.
12
3
Em
Axi
×
24
256
2
1
.
0
2
C
MR
Sag
×
128
×
1
.
5
f,70yr
64
2
7
.
12
3
Tx
Axi
×
22
64
2
7
.
12
3
Em
Axi
×
22
1
.
17
2
D
MR
Axi
192
×
256
×
24
×
6
.
0
m,45yr
64
2
6
.
23
2
Tx
Axi
×
31
×
7
.
12
64
2
6
.
23
2
Em
Axi
×
31
×
7
.
12
180
2
1
.
41
2
E
MR
Sag
×
120
×
1
.
5
m,40yr
Tx
Axi
64
2
26
6
23
2
7
12
×
.
×
.
Em
Axi
64
2
26
6
23
2
7
12
×
.
×
.
F
MR
Sag
192
256
120
1
41
2
1
5
m,60yr
×
×
.
×
.
Tx
Axi
64
2
53
3
50
3
×
.
Em
Axi
64
2
53
3
50
3
×
.
G
MR
Sag
192
×
256
×
120
1
.
41
2
×
1
.
5
m,13yr
64
2
6
.
23
2
Tx
Axi
×
28
×
7
.
12
64
2
6
.
23
2
Em
Axi
×
28
×
7
.
12
Ohio), and the nuclear images were acquired with a Prism 3000XP (Philips Med-
ical Systems) scanner. In all Tx and Em scans, Technetium-99m hexamethyl-
propolamine-oxime (Tc-99m HMPAO) was used as the isotope. The Tx and Em
images were acquired simultaneously using the STEP (simultaneous transmis-
sion emission protocol) protocol. Thus, the Tx and Em images are registered
intrinsically (see [43, 44, 45, 46]).
10.4.2
Experimental Setup—Maximization
of Similarity Measures
Cross-entropy, reversed cross-entropy, and symmetric divergence are maxi-
mized when the joint pdf is derived from an optimal registration and it differs
greatly from a unlikely priori estimate. This subsection discusses the details of
the experimental setup as well as the determination of the registration accuracy.
