9pinhole collimator on ARGUS EPIC detector.

1
9-pinhole collimator on ARGUS EPIC detector.
2
Close-up of 9 pinhole collimator.
3
Patient positioned under ARGUS with 9-pinhole
collimator. Patient studies require a 20 minute
acquisition using 6.0 mCi of TC-99m and 4.0 mCi
of Tl-201.
4
Simple dome phantom imaged with nonrotational
SPECT using the 9-pinhole camera.
Circumferential profiles showing /- 10 changes
around the wall. Solid line is the stress
(Thallium) curve and the long dashed line is the
rest (Tc - Cardiolite) curve. Stress and rest
were acquired simultaneously.
5
Simple dome phantom imaged with 9 pinhole camera.
Short axis profiles. The 9 pinhole system
distorts the images near the apex slightly, with
the walls in the long axis profiles being
slightly hotter than the apex. Stress and rest
were acquired simultaneously. Each of the long
axis profiles is 22.5 degrees rotated from the
previous profile. The conventional horizontal
long axis is labeled 0 degrees and the
conventional vertical long axis is labeled 90
degrees.
6
Simple dome phantom imaged by rotational SPECT
using the parallel hole collimator showing - 10
changes in the wall. Solid line is the stress
(Tc - Cardiolite) curve and the long dashed line
is the rest (Thallium) curve. Stress and rest
were acquired separately, but the phantom was not
moved between acquisitions. 64 views were
acquired over 180 degrees of rotation. The data
was processed on a Pegasys using AutoQuant
software. The short axis images were then
exported to our analysis program to develop the
circumferential profile curves and displays. No
other processing was done to these images.
7
Simple dome phantom imaged with parallel hole
collimator, 64 views over 180 degrees. Short
axis profiles. Here the apex is hotter than the
walls in the long axis profiles. Stress and rest
were acquired separately, but the phantom was not
moved between acquisitions. The data was
processed on a Pegasys using AutoQuant software.
The short axis images were then exported to our
analysis program to develop the circumferential
profile curves and displays. No other processing
was done to these images. Each of the long axis
profiles is 22.5 degrees rotated from the
previous profile. The conventional horizontal
long axis is labeled 0 degrees and the
conventional vertical long axis is labeled 90
degrees.
8
Normal patient images using the 9-pinhole
collimated system. The stress (Thallium - solid
line) and rest (Tc - Cardiolite - long dashes)
curves show lt10 differences and remain above the
lower limits of normal curve (fine dashed line).
9
Normal patient images corresponding to previous
slide from 9-pinhole collimated system. The
stress (Thallium) and rest (Tc - Cardiolite)
images look very similar. Each of the long axis
profiles is 22.5 degrees rotated from the
previous profile. The conventional horizontal
long axis is labeled 0 degrees and the
conventional vertical long axis is labeled 90
degrees.
10
Gated analysis of normal patient. Time activity
curve is in upper left. 16 gates per cardiac
cycle. End Diastole (ED) is the top row and End
Systole (ES) is in the bottom row. Each of the
long axis profiles is 22.5 degrees rotated from
the previous profile. The conventional
horizontal long axis is labeled 0 degrees and the
conventional vertical long axis is labeled 90
degrees.
11
Gated analysis of normal patient. Slide mouse
over image to get MPEG to play. Each of the
long axis profiles is 22.5 degrees rotated from
the previous profile. The conventional
horizontal long axis is labeled 0 degrees and the
conventional vertical long axis is labeled 90
degrees.
12
Abnormal patient images from 9 pinhole collimated
system. The stress (Thallium - solid line) and
rest (Tc - Cardiolite - long dashes) curves show
large (gt20) differences and go below the lower
limits of normal curve (light dotted line).
13
Abnormal patient images from 9-pinhole collimated
system. The stress (Thallium) and rest (Tc -
Cardiolite) images show large differences in the
anterior wall. Each of the long axis profiles is
22.5 degrees rotated from the previous profile.
The conventional horizontal long axis is labeled
0 degrees and the conventional vertical long axis
is labeled 90 degrees.
14
Gated analysis of abnormal patient. Time
activity curve is in upper left. 16 gates per
cardiac cycle. End Diastole (ED) is the top row
and End Systole (ES) is in the bottom row. EF
however, looks normal. Each of the long axis
profiles is 22.5 degrees rotated from the
previous profile. The conventional horizontal
long axis is labeled 0 degrees and the
conventional vertical long axis is labeled 90
degrees.