Leila Moghaddam Banaem In diagnosis radiopharmaceuticals produce images that enable the function and living chemistry of the body to be evaluated. Radiopharmaceuticals.

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Presentation transcript:

Leila Moghaddam Banaem

In diagnosis radiopharmaceuticals produce images that enable the function and living chemistry of the body to be evaluated. Radiopharmaceuticals are designed for internal radiotherapy, because they accumulate in tumours and eliminate cancerous cells by selective targeting, without harming healthy cells. Bone-seeking radiopharmaceuticals are used for the palliative treatment of bone pain resulting from skeletal metastases. 46Sc-HEDP & Dosimetry

Mechanisms of Localization Compartmental localization and leakage Cell sequestration Phagocytosis Passive diffusion Metabolism Active transport 46Sc-HEDP & Dosimetry

Localization (cont.) Capillary blockade Perfusion Chemotaxis Antibody-antigen complexation Receptor binding Physiochemical adsorption 46Sc-HEDP & Dosimetry

Ligand from Latin ligare “to bind” “a molecule or anion with an unshared pair of electrons donating a lone pair to a metal cation to form a coordinate covalent bond” Elements with unshared pairs of electrons capable of being ligands: C, N, O, S, F. Cl, Br, I Molecules acting as ligands: :NH 3 ; :OH 2 Ions acting as ligands: Cl -, Br -, I -, 46Sc-HEDP & Dosimetry

Ideal Radiopharmaceuticals 46Sc-HEDP & Dosimetry Low radiation dose High target/nontarget activity Safety Convenience Cost-effectiveness

Therapy isotopes for bone pain palliation 46Sc-HEDP & Dosimetry

Bone Seeker Carrier 46Sc-HEDP & Dosimetry O PP O O-O- O-O- O-O- O-O- C R1 R2 Molecular structure of Bisphosphonate O PP O O-O- O-O- O-O- O-O- C C HH H OH Molecular structure of HEDP C 2 H 4 Na 4 O 7 P 2

Scandium رادیونوکلئیدنیمه عمر حالت واپاشی انرژی گاما ((keV متوسط انرژی بتا ((keV اسکاندیوم -4683/9 روزبتا منفی (99/98%)889/28 (99/99%)1120/55 (99/99%)112 اسکاندیوم -473/35 روزبتا منفی (68%)159(68%)142-(32%)204 اسکاندیوم -481/82 روزبتا منفی (100%)1312-(100%)983 (97%)1037 (100%)157-(89%)226 46Sc-HEDP & Dosimetry

HPGe spectrum for SC-46 chloride solution used in this study 46Sc-HEDP & Dosimetry

TLC of ScCl3 by NH4OH:CH3OH:H2O 46Sc-HEDP & Dosimetry

TLC of 46 Sc-HEDP 46Sc-HEDP & Dosimetry

Biodistribution of 46 Sc-HEDP 46Sc-HEDP & Dosimetry

Biodistribution of 186 Re-HEDP 46Sc-HEDP & Dosimetry

Spect of Rat 24h after Re-HEDP injection 46Sc-HEDP & Dosimetry

Spect of Rat 4h after 46 Sc-HEDP injection 46Sc-HEDP & Dosimetry

186 Re-HEDP scintigraphy 48 h after the treatment infusion. 46Sc-HEDP & Dosimetry

Dosimetry Methods 46Sc-HEDP & Dosimetry Types of Dosimetry Marinelli/Quimby ICRP Dose Calculation for Staff and Patients ICRPII ICRP30 RADAR Electronic Source Software OLINDA/EXM Dose Calculation for Staff and Patients MIRD

Dose Calculation-MIRD method 46Sc-HEDP & Dosimetry A(t)=a 1 e -b 1 t +a 2 e -b 2 t +…. ICRP89 (International Commission on Radiological Protection)

Estimated human %ID 46Sc-HEDP & Dosimetry

Estimated Human Absorbed Dose Organ Accumulated Acivity (µCi-h) Absorbed Dose (mGy/MBq) L-Intestine H-Intestine Stomach Kidney Liver Lung Spleen Bone-Surface Red-Marrow Total Body Sc-HEDP & Dosimetry

Conclusion 186 Re-HEDP 47 Sc-HEDP Stability48h in room Temp. Biodistribution4 h maximum %2.4in bone 4h maximum & %6.31 in bone PerformingSimple Target preparation Equal product expense With impurity Simple Target preparation Needs separation Equal product expense Without impurity 46Sc-HEDP & Dosimetry