TY - GEN
T1 - Three-dimensional event localization in bulk scintillator crystals using optical coded apertures
AU - Braverman, J. B.
AU - Fabris, L.
AU - Newby, J.
AU - Hornback, D.
AU - Ziock, K. P.
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2016/3/10
Y1 - 2016/3/10
N2 - Scintillator-based detectors are among the most commonly used methods for detecting ionizing radiation. Scintillators provide a reliable, cost-effective, and simple way to make large-volume detectors. Furthermore, localizing the position of the interactions in three dimensions within the crystals is useful to a wide array of fields. The most straightforward way of doing this is to pair the crystal with a position-sensitive phototransducer (PT). This allows for measurement of the shape of the light spot at the PT plane. Using this information, various methods exist to localize the gamma-ray interaction in the crystal; however, the position resolution worsens the farther the event occurs from the PT plane. To improve on the localization ability, this work uses an optical coded-aperture shadow mask between the crystal and the PT. The recorded detector response is used in reconstructing the event over the entire depth of the crystal, and the sharpest reconstructed image gives an event's depth. The lateral position is given from the standard coded-aperture image reconstruction. Experimental results obtained by emulating a 30-mm-thick crystal using a thin 1-mm-thick NaI(Tl) crystal and different amounts of light pipe between the crystal and the PT plane achieved ∼1 to 2-mm resolution in all three dimensions throughout most of the 30-mm-thick crystal.
AB - Scintillator-based detectors are among the most commonly used methods for detecting ionizing radiation. Scintillators provide a reliable, cost-effective, and simple way to make large-volume detectors. Furthermore, localizing the position of the interactions in three dimensions within the crystals is useful to a wide array of fields. The most straightforward way of doing this is to pair the crystal with a position-sensitive phototransducer (PT). This allows for measurement of the shape of the light spot at the PT plane. Using this information, various methods exist to localize the gamma-ray interaction in the crystal; however, the position resolution worsens the farther the event occurs from the PT plane. To improve on the localization ability, this work uses an optical coded-aperture shadow mask between the crystal and the PT. The recorded detector response is used in reconstructing the event over the entire depth of the crystal, and the sharpest reconstructed image gives an event's depth. The lateral position is given from the standard coded-aperture image reconstruction. Experimental results obtained by emulating a 30-mm-thick crystal using a thin 1-mm-thick NaI(Tl) crystal and different amounts of light pipe between the crystal and the PT plane achieved ∼1 to 2-mm resolution in all three dimensions throughout most of the 30-mm-thick crystal.
UR - http://www.scopus.com/inward/record.url?scp=84965057221&partnerID=8YFLogxK
U2 - 10.1109/NSSMIC.2014.7431259
DO - 10.1109/NSSMIC.2014.7431259
M3 - Conference contribution
AN - SCOPUS:84965057221
T3 - 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014
BT - 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014
Y2 - 8 November 2014 through 15 November 2014
ER -