High Resolution Detector Modules Based on NaI(T1) Arrays for Small Animal Imaging Page: 4 of 5
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mm thick. The phantom was placed in contact with the
collimators for all the tests performed with this phantom.
The imaging result using the high resolution etched
copper collimator is shown in Fig. 3. The histogram at the
bottom shows a projection along the x-axis of the capillary
phantom image. In Fig.4 are shown images obtained with
the same phantom using the medium resolution etched
Fig.4: Mdiumresoutio ethd opr 0liao poucdt bv
1 20 25 3
Fig, 4: Medium resolution etched copper collimator produced the above
image and an accompanying plot of a projection along the x-axis of the
same capillary phantom (note the interference effects of the collimator
structure seen in the vertical coordinate).
The 0.5 mm pinhole tungsten collimator was then used to
image the capillary phantom. In Fig. 5 shown is the image of
the three capillaries produced using a 0.5 mm pinhole with
magnification 5. A measured spatial resolution of less than
0.75 mm FWHM was attained in this test. Also displayed is
the normalized energy spectrum.
Fig. 5: Shown is an image (top) produced using a 0.5 mm pinhole using a
magnification of 5. Note a reversed order of the capillaries in comparison
to the previous images. Spatial resolution of less than 0.75 mm FWHM was
measured. At the bottom is a normalized energy spectrum.
C- Imaging of Technetium-99
Finally we tested the array i
imaging. The commonly used
readily used in medical researn
disease states. The energy and fi
done using a Tc-99m source. Ij
standard high resolution paralle
pinhole collimator of the same
this time filled with Tc-99m
Results obtained with the
lead collimator are shown in F
collimator has hexagonal open
0.15 mm septa. With this co
separation of the capillaries is n
Fig.6: High resolution lead collimato
positions of the capillary phantom and
the reversed order of the capillaries in
collimator (shown in Fig. 7) r
of the capillaries of 0.75 mm
i the application of Tc-99m
* uclear medicine isotope is
utilizing animals to study
* d calibration procedure was
ges were obtained with the
I tole lead collimator and the
hantom described above but
h gh resolution parallel hole
i .6. The 3.5 cm thick lead
i g 1.22 mm in size, with
ll mator not surprisingly the
o fully achieved.
20 25 515
r produced images at left for two
x projection of the right image (note
ihe image compared to the pinhole
r Isuts with the pinhole
s Cited in a measured FWHM
perpendicular rays to the
lb 2 20 1 ob
Fig-7: Images produced using a 0.5 mm pinhole collimator. The left image
is a raw unprocessed image and the middle image has been filtered and
smoothed. The x-projection histograqi (right) of the three capillaries
obtained with magnification -65 Resolu'ion eas measured to be 0.75 mn
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Weisenberger, A.G.; Wojcik, R.; Majewski, S. & Popov, V. High Resolution Detector Modules Based on NaI(T1) Arrays for Small Animal Imaging, article, November 1, 2001; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc717797/m1/4/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.