BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Invited talk: Towards High Sensitivity and High-Resolution PET Sca nners\; Image-guided Proton Therapy and Total Body imaging DTSTART;VALUE=DATE-TIME:20220713T140500Z DTEND;VALUE=DATE-TIME:20220713T142500Z DTSTAMP;VALUE=DATE-TIME:20260720T195310Z UID:indico-contribution-48-729@indico.koza.if.uj.edu.pl DESCRIPTION:Speakers: Karol Lang\; University of Texas at Austin\, USA ()\ nhttps://indico.koza.if.uj.edu.pl/event/7/contributions/729/ LOCATION:Collegium Novodvorscianum URL:https://indico.koza.if.uj.edu.pl/event/7/contributions/729/ END:VEVENT BEGIN:VEVENT SUMMARY:Polarization and directional correlations of γ-rays for nuclei: S cope in PET DTSTART;VALUE=DATE-TIME:20220713T142500Z DTEND;VALUE=DATE-TIME:20220713T144500Z DTSTAMP;VALUE=DATE-TIME:20260720T195310Z UID:indico-contribution-48-693@indico.koza.if.uj.edu.pl DESCRIPTION:Speakers: Pragya Das\; Indian Institute of Technology Bombay\, India ()\nThe spectroscopic investigation of nuclei at high spin states h as led to many discoveries\, e.g.\, exotic shapes\, super-deformation\, sh ape coexistence\, and chiral symmetry. In this endeavor\, the accurate spi n-parity assignment to nuclear states is crucial. Many studies in the lite rature have focused on finding the directional correlation ratios (DCO) fo r the assigning spins without any polarization measurement for parity dete rmination. The use of polarization-directional correlation (PDCO) [1] not only determines the parity\, but can also easily distinguish stretched and non-stretched γ-transitions\, allowing to establish both spin and parity . We have confirmed some earlier tentative spin-parities in 128I and 129Xe and modified a few of them with our new results on mixing ratios using PD CO. It is needless to mention here that a fresh understanding of the nucle ar structure is required if the spin-parity of the bandhead state is chang ed.\nWe performed an experiment via the fusion-evaporation reaction – 11 B (124Sn\; α3n\, p5n) 128I\, 129Xe – using the Pelletron accelerator at the Tata Institute of Fundamental Research (Mumbai\, India). The experime ntal set-up (INGA) consisted of 21 Compton suppressed HPGe clover detector s. The list-mode data [2] were utilized to construct the asymmetric matrix for finding PDCO. We used 90∘ detectors as polarimeters (θpil) and all other detectors as directional detectors (θdir)\, and followed the PDCO formalism by Droste et al. [1].\nFor the case of 129Xe\, we assigned [3] t he bandhead spin-parity 21/2+ to a 2180 keV state decaying via 604 keV γ- ray\, based on only the DCO information. Our finding (21/2+) and other ava ilable results for the same state – 19/2+ by Huang et al. [4] and 19/2 – by Helppi et al. [5] – were all in complete disagreement. So\, it be came imperative to confirm our assignment by further analyzing the PDCO da ta\, which enabled us to establish the same state 21/2+. Moreover\, there were other discrepancies\, and we could resolve them by critically examini ng the PDCO contour plots\, i.e.\, polarization (P) vs. DCO ratios (RDCO) for different values of mixing ratios. It was possible to distinguish stre tched and non-stretched transitions. Notably\, no polarization measurement existed in the literature prior to our work.\nIn the context of using pol arization correlation of coincident γ-rays\, the property of entanglement (orthogonal polarization) of annihilation photons (511 keV) has immense p otential in positron emission tomography (PET). It can help classify the t rue coincidence events amongst the scattered\, random\, and multiple event s. However\, the research area has not been fully explored\, probably beca use of experimental difficulties. Only a few simulation-based studies exis t [6\, 7]. We have also tried a preliminary study [8] with many simplified assumptions but have not yet succeeded in improving the image quality.\n\ n[1] Ch. Droste et al.\, Nucl. Instr. Meth. Nucl. Res. A 378 (1996) 518.\n [2] U. Lamani et al.\, Nucl. Phys. A 1014 (2021) 122220.\n[3] V. K. Pasi e t al.\, JPS Conf. Proc. 6 (2015) 030016.\n[4] Y. Huang et al.\, Phys. Rev. C 93\, (2016) 064315.\n[5] H. Helppi et al.\, Nucl. Phys. A 357 (1981) 33 3.\n[6] A. L. McNamara et al.\, Phys. Med. Biol. 59 (2014) 7587.\n[7] M To ghyani et al.\, Phys. Med. Biol. 61 (2016) 5803.\n[8] Satyajit Ghosh\, Ph. D. thesis submitted (2022)\, IIT Bombay\, India.\n\nhttps://indico.koza.i f.uj.edu.pl/event/7/contributions/693/ LOCATION:Collegium Novodvorscianum URL:https://indico.koza.if.uj.edu.pl/event/7/contributions/693/ END:VEVENT BEGIN:VEVENT SUMMARY:Invited talk: Multi-isotope imaging and quantum chemical sensing w ith PET and SPECT nuclides DTSTART;VALUE=DATE-TIME:20220713T134500Z DTEND;VALUE=DATE-TIME:20220713T140500Z DTSTAMP;VALUE=DATE-TIME:20260720T195310Z UID:indico-contribution-48-692@indico.koza.if.uj.edu.pl DESCRIPTION:Speakers: Kenji Shimazoe\; The University of Tokyo\, Japan ()\ nMulti-isotope imaging is important for investigating multi-molecule dynam ics in individuals. PET and SPECT dual tracer imaging in vivo is demonstra ted with a developed Compton PET hybrid camera. In nuclear medicine imagin g\, quantum chemical sensing\, such as pH and chemical state of molecule\, can be additional value to accumulation imaging. pH sensing and imaging i s demonstrated with liquid state In-111 SPECT nuclide by double-photon ima ging method. Recent works on multi-isotope imaging and quantum sensing wit h double photon imaging will be introduced.\n\nhttps://indico.koza.if.uj.e du.pl/event/7/contributions/692/ LOCATION:Collegium Novodvorscianum URL:https://indico.koza.if.uj.edu.pl/event/7/contributions/692/ END:VEVENT BEGIN:VEVENT SUMMARY:Key talk: PET imaging innovations DTSTART;VALUE=DATE-TIME:20220713T132000Z DTEND;VALUE=DATE-TIME:20220713T134500Z DTSTAMP;VALUE=DATE-TIME:20260720T195310Z UID:indico-contribution-48-691@indico.koza.if.uj.edu.pl DESCRIPTION:Speakers: Taiga Yamaya\; National Institutes for Quantum and R adiological Science and Technology (QST)\, Japan ()\nIn current PET\, only a few percent of gamma rays emitted from a patient are used for imaging. Therefore\, improvement of the sensitivity is a hot topic worldwide. Axial extension\, which is referred as total-body PET\, is essential in terms o f the sensitivity improvement. In organ dedicated imaging\, on the other h and\, it is possible to improve the sensitivity without increasing the num ber of detectors. Improvement of spatial resolution is also expected by el iminating the photon non-collinearity effect.\nIn the former part of this presentation\, development of brain-dedicated PET systems will be reviewed . Among them\, we have recently developed VRAIN\, a PET system with a hemi spherical detector arrangement [1]. The hemispherical geometry fits the he ad best\, and minimizes the photon non-collinearity effect by reducing the detector-to-detector distance.\nIn the latter part of the presentation\, alternative approaches to improve the sensitivity rather than increasing t he solid angle of the measurement system will be reviewed. Among them\, wh ole gamma imaging (WGI) is a novel concept of combined PET with Compton im aging. An additional detector ring\, which is used as the scatterer\, is i nserted in a conventional PET ring so that single gamma rays can be detect ed by the Compton imaging method. In addition to conventional PET and Comp ton imaging\, further large impact can be expected for triple gamma emitte rs such as Sc-44 (~4 h half-life)\, that emits a positron and a 1157 keV g amma ray almost at the same time. In principle\, only a few decays would b e enough to localize the source position by calculating intersection point s of a 511 keV line-of-response with a 1157 keV Compton cone. We developed a prototype of the WGI system [2][3]\, and a Na-22 point source\, which e mits a 1275 keV gamma ray soon after a positron decay\, was measured as an alternative to Sc-44. In the triple gamma imaging\, where only simple bac kprojection was applied and no image reconstruction algorithm was applied\ , spatial resolution for the Na-22 point source was 4.8 mm FWHM (8 cm off- center) - 5.7 mm FWHM (center). WGI can be also used to measure positroniu m lifetime [4]\, which may enable a new field of “quantum PET (Q-PET)” . One possible application of Q-PET is hypoxia imaging of tumor patients [ 5].\n\n[1] E. Yoshida\, Hideaki Tashima\, Go Akamatsu\, et al.\, “245 ps -TOF brain-dedicated PET prototype with a hemispherical detector arrangeme nt\,” Phys. Med. Biol.\, 65\, 145008\, 2020.\n[2] E. Yoshida\, H. Tashim a\, K. Nagatsu\, et al.\, "Whole gamma imaging: a new concept of PET combi ned with Compton imaging\," Phys. Med. Biol.\, 65\, 125013\, 2020.\n[3] H. Tashima\, E. Yoshida\, H. Wakizaka\, et al.\, "3D Compton image reconstru ction method for whole gamma imaging\," Phys. Med. Biol.\, 65\, 225038\, 2 020.\n[4] P. Moskal\, B. Jasińska\, E.Ł. Stępień\, et al.\, “Positro nium in medicine and biology\,” Nat. Rev. Phys. 1\, 527-529\, 2019.\n[5] K. Shibuya\, H. Saito\, F. Nishikido\, et al.\, "Oxygen sensing ability o f positronium atom for tumor hypoxia imaging\," Commun. Phys. 3\, 173\, 20 20.\n\nhttps://indico.koza.if.uj.edu.pl/event/7/contributions/691/ LOCATION:Collegium Novodvorscianum URL:https://indico.koza.if.uj.edu.pl/event/7/contributions/691/ END:VEVENT END:VCALENDAR