Dose assessment of diagnostic nuclear medicine procedures is necessary to
further optimize respective procedure, estimate radiation risk, improve
radiation safety and verify compliance of local practice with guidelines. In
line with Council Directive 2013/59/EURATOM, patient medical documentation
should include information related to radiation exposure. The aim of this
work is to present the patient radiation dose assessment system designed for
routine clinical use, that uses in-house designed worksheets for dose
calculation based on relevant parameters introduced by the ICRP
publications. Dose reports provide information about the absorbed dose
delivered to the target and non-target organs of interest and the effective
dose for each diagnostic procedure. The data from the dose reports was used
to investigate average patient exposure levels during a one-year period and
the results are presented. The implemented system has improved the quality
of services provided and understanding of radiation risks. Moreover, the
presented results have stimulated further optimization of nuclear medicine
processes.
Cilj: Cilj rada bio je procijeniti doprinos jednofotonske emisijske tomografije / kompjutorizirane tomografije somatostatinskih receptora (SR SPECT/CT) s 99mTc-EDDA/HYNIC-Tyr3-oktreotidom (99mTc-Tektrotyd) u dijagnostici i procjeni proširenosti bolesti kod pacijenata oboljelih od neuroendokrinih tumora (NET-ova). Ispitanici i metode: Retrospektivno je analizirano 120 SR SPECT/CT snimanja pacijenata s patohistološki dokazanim NET-om s obzirom na vizualizaciju primarnih lezija i metastaza. U 45 pacijenata učinjena je i pozitronska emisijska tomografija 18F-fluorodeoksiglukozom (18F-FDG PET/CT) te su nalazi uspoređeni s nalazima SR SPECT/CT-a i vrijednostima kromogranina A. Rezultati: Od 120 pacijenata 47 (39 %) je na SR SPECT/CT upućeno nakon odstranjenja primarne lezije. Od preostala 73 pacijenta (61 %), u 56 (77 %) primarni je tumor bio vidljiv SR SPECT/CT-om, a u 9 (12 %) poznata lezija nije akumulirala radiofarmak. U 8 (11 %) pacijenata s NET-om nepoznatog primarnog sijela nalaz je bio negativan. Od 68 (57 %) pacijenta s dokazanim metastazama, u njih 57 (84 %) bile su vidljive SR SPECT/CT-om, a u 11 (16 %) nisu akumulirale radiofarmak. Od 45 (38 %) pacijenata kojima je učinjen i 18F-FDG PET/CT, u 27 (60 %) detekcija primarnih lezija i metastaza bila je sukladna nalazu SR SPECT/CT-a. Osjetljivost SR SPECT/CT-a bila je 77 % za primarne lezije i 84 % za metastaze, a 18F-FDG PET/CT-a 75 % za primarne lezije i 76 % za metastaze. Vrijednosti kromogranina A nisu pokazale statistički signifikantnu korelaciju s nalazima slikovne dijagnostike. Zaključci: SR SPECT/CT ima visoku osjetljivost za detekciju NET-ova. Osim toga, potvrđena je komplementarnost s 18F-FDG PET/CT-om te kod pacijenata s negativnim nalazom SR SPECT/CT-a treba učiniti 18F-FDG PET/CT i obrnuto.
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