Excellent pulse height uniformity response of a new LaBr3:Ce scintillation crystal for gamma ray imaging
2015 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 787, 46-50 p.Article in journal (Refereed) Published
Nuclear Medicine SPECT imaging is taking on new challenges, regarding the improvement of quality and contrast of images. In order to reach this goal, energy resolution and Compton rejection capability have to be enhanced. For detectors based on scintillation crystal, the choice of a scintillator with high light yield is suitable; recently one of the major candidates is Lanthanum Tri-Bromide (LaBr3:Ce), with its high 63,000 ph/MeV light yield. Unfortunately, LaBr3:Ce suffers size limitations due to the actual growth techniques (maximum 3 in diameter) and has also elevated cost. For these reasons, great interest is shown on small field of view deleclors based on LaBr3:Ce, Lhough l for imaging of specific physiological process or organ. To improve energy resolution, continuous crystals are more appropriate instead than pixelaled ones. Since in a continuous crystal a decrease in position linearity, due Lo Lhe light reflections, is typically obtained at the edges, an absorbent treatment of surfaces is generally ulilized for SPECT applicalions. On Lhe other hand, light absorption causes a relevara degraclalion of local energy resolution and pulse height uniformily response, affecling local image confrasl. In this work an analysis on a new conlinuous LaBr3:Ce scinlillalion crystal with size proper lo a small field of view gamma imager but with reflective treatment of surfaces is presented. This leads up to outstanding overall and local energy resolution results and excellent pulse height uniformity response On the whole field of view. Furthermore, preliminary imaging results are satisfactory, compared to the ones from a scintillation crystal with absorbent edges.
Place, publisher, year, edition, pages
2015. Vol. 787, 46-50 p.
LaBr3:Ce crystal, Pulse height uniformity, Energy resolution, Spectrometric crystals, Small FOV detectors
Radiology, Nuclear Medicine and Medical Imaging
IdentifiersURN: urn:nbn:se:kth:diva-169239DOI: 10.1016/j.nima.2014.11.003ISI: 000354869900010OAI: oai:DiVA.org:kth-169239DiVA: diva2:821340
QC 201506152015-06-152015-06-122015-06-15Bibliographically approved